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neovim/src/nvim/diff.c

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
/// @file diff.c
///
/// Code for diff'ing two, three or four buffers.
///
/// There are three ways to diff:
/// - Shell out to an external diff program, using files.
/// - Use the compiled-in xdiff library.
/// - Let 'diffexpr' do the work, using files.
#include <inttypes.h>
#include <stdbool.h>
#include "nvim/vim.h"
#include "xdiff/xdiff.h"
#include "nvim/ascii.h"
#include "nvim/diff.h"
#include "nvim/buffer.h"
#include "nvim/change.h"
#include "nvim/charset.h"
#include "nvim/cursor.h"
#include "nvim/eval.h"
#include "nvim/ex_cmds.h"
#include "nvim/ex_docmd.h"
#include "nvim/fileio.h"
#include "nvim/fold.h"
#include "nvim/mark.h"
#include "nvim/mbyte.h"
#include "nvim/memline.h"
#include "nvim/message.h"
#include "nvim/misc1.h"
#include "nvim/memory.h"
#include "nvim/move.h"
#include "nvim/normal.h"
#include "nvim/option.h"
#include "nvim/path.h"
#include "nvim/screen.h"
#include "nvim/strings.h"
#include "nvim/undo.h"
#include "nvim/window.h"
#include "nvim/os/os.h"
#include "nvim/os/shell.h"
static int diff_busy = false; // using diff structs, don't change them
static bool diff_need_update = false; // ex_diffupdate needs to be called
// Flags obtained from the 'diffopt' option
#define DIFF_FILLER 0x001 // display filler lines
#define DIFF_IBLANK 0x002 // ignore empty lines
#define DIFF_ICASE 0x004 // ignore case
#define DIFF_IWHITE 0x008 // ignore change in white space
#define DIFF_IWHITEALL 0x010 // ignore all white space changes
#define DIFF_IWHITEEOL 0x020 // ignore change in white space at EOL
#define DIFF_HORIZONTAL 0x040 // horizontal splits
#define DIFF_VERTICAL 0x080 // vertical splits
#define DIFF_HIDDEN_OFF 0x100 // diffoff when hidden
#define DIFF_INTERNAL 0x200 // use internal xdiff algorithm
#define DIFF_CLOSE_OFF 0x400 // diffoff when closing window
#define ALL_WHITE_DIFF (DIFF_IWHITE | DIFF_IWHITEALL | DIFF_IWHITEEOL)
static int diff_flags = DIFF_INTERNAL | DIFF_FILLER | DIFF_CLOSE_OFF;
static long diff_algorithm = 0;
#define LBUFLEN 50 // length of line in diff file
// kTrue when "diff -a" works, kFalse when it doesn't work,
// kNone when not checked yet
static TriState diff_a_works = kNone;
// used for diff input
typedef struct {
char_u *din_fname; // used for external diff
mmfile_t din_mmfile; // used for internal diff
} diffin_T;
// used for diff result
typedef struct {
char_u *dout_fname; // used for external diff
garray_T dout_ga; // used for internal diff
} diffout_T;
// two diff inputs and one result
typedef struct {
diffin_T dio_orig; // original file input
diffin_T dio_new; // new file input
diffout_T dio_diff; // diff result
int dio_internal; // using internal diff
} diffio_T;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "diff.c.generated.h"
#endif
/// Called when deleting or unloading a buffer: No longer make a diff with it.
///
/// @param buf
void diff_buf_delete(buf_T *buf)
{
FOR_ALL_TABS(tp) {
int i = diff_buf_idx_tp(buf, tp);
if (i != DB_COUNT) {
tp->tp_diffbuf[i] = NULL;
tp->tp_diff_invalid = true;
if (tp == curtab) {
diff_redraw(true);
}
}
}
}
/// Check if the current buffer should be added to or removed from the list of
/// diff buffers.
///
/// @param win
void diff_buf_adjust(win_T *win)
{
if (!win->w_p_diff) {
// When there is no window showing a diff for this buffer, remove
// it from the diffs.
bool found_win = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if ((wp->w_buffer == win->w_buffer) && wp->w_p_diff) {
found_win = true;
}
}
if (!found_win) {
int i = diff_buf_idx(win->w_buffer);
if (i != DB_COUNT) {
curtab->tp_diffbuf[i] = NULL;
curtab->tp_diff_invalid = true;
diff_redraw(true);
}
}
} else {
diff_buf_add(win->w_buffer);
}
}
/// Add a buffer to make diffs for.
///
/// Call this when a new buffer is being edited in the current window where
/// 'diff' is set.
/// Marks the current buffer as being part of the diff and requiring updating.
/// This must be done before any autocmd, because a command may use info
/// about the screen contents.
///
/// @param buf The buffer to add.
void diff_buf_add(buf_T *buf)
{
if (diff_buf_idx(buf) != DB_COUNT) {
// It's already there.
return;
}
int i;
for (i = 0; i < DB_COUNT; ++i) {
if (curtab->tp_diffbuf[i] == NULL) {
curtab->tp_diffbuf[i] = buf;
curtab->tp_diff_invalid = true;
diff_redraw(true);
return;
}
}
EMSGN(_("E96: Cannot diff more than %" PRId64 " buffers"), DB_COUNT);
}
///
/// Remove all buffers to make diffs for.
///
static void diff_buf_clear(void)
{
for (int i = 0; i < DB_COUNT; i++) {
if (curtab->tp_diffbuf[i] != NULL) {
curtab->tp_diffbuf[i] = NULL;
curtab->tp_diff_invalid = true;
diff_redraw(true);
}
}
}
/// Find buffer "buf" in the list of diff buffers for the current tab page.
///
/// @param buf The buffer to find.
///
/// @return Its index or DB_COUNT if not found.
static int diff_buf_idx(buf_T *buf)
{
int idx;
for (idx = 0; idx < DB_COUNT; ++idx) {
if (curtab->tp_diffbuf[idx] == buf) {
break;
}
}
return idx;
}
/// Find buffer "buf" in the list of diff buffers for tab page "tp".
///
/// @param buf
/// @param tp
///
/// @return its index or DB_COUNT if not found.
static int diff_buf_idx_tp(buf_T *buf, tabpage_T *tp)
{
int idx;
for (idx = 0; idx < DB_COUNT; ++idx) {
if (tp->tp_diffbuf[idx] == buf) {
break;
}
}
return idx;
}
/// Mark the diff info involving buffer "buf" as invalid, it will be updated
/// when info is requested.
///
/// @param buf
void diff_invalidate(buf_T *buf)
{
FOR_ALL_TABS(tp) {
int i = diff_buf_idx_tp(buf, tp);
if (i != DB_COUNT) {
tp->tp_diff_invalid = true;
if (tp == curtab) {
diff_redraw(true);
}
}
}
}
/// Called by mark_adjust(): update line numbers in "curbuf".
///
/// @param line1
/// @param line2
/// @param amount
/// @param amount_after
void diff_mark_adjust(linenr_T line1, linenr_T line2, long amount,
long amount_after)
{
// Handle all tab pages that use the current buffer in a diff.
FOR_ALL_TABS(tp) {
int idx = diff_buf_idx_tp(curbuf, tp);
if (idx != DB_COUNT) {
diff_mark_adjust_tp(tp, idx, line1, line2, amount, amount_after);
}
}
}
/// Update line numbers in tab page "tp" for "curbuf" with index "idx".
///
/// This attempts to update the changes as much as possible:
/// When inserting/deleting lines outside of existing change blocks, create a
/// new change block and update the line numbers in following blocks.
/// When inserting/deleting lines in existing change blocks, update them.
///
/// @param tp
/// @param idx
/// @param line1
/// @param line2
/// @param amount
/// @amount_after
static void diff_mark_adjust_tp(tabpage_T *tp, int idx, linenr_T line1,
linenr_T line2, long amount, long amount_after)
{
if (diff_internal()) {
// Will update diffs before redrawing. Set _invalid to update the
// diffs themselves, set _update to also update folds properly just
// before redrawing.
// Do update marks here, it is needed for :%diffput.
tp->tp_diff_invalid = true;
tp->tp_diff_update = true;
}
int inserted;
int deleted;
if (line2 == MAXLNUM) {
// mark_adjust(99, MAXLNUM, 9, 0): insert lines
inserted = amount;
deleted = 0;
} else if (amount_after > 0) {
// mark_adjust(99, 98, MAXLNUM, 9): a change that inserts lines
inserted = amount_after;
deleted = 0;
} else {
// mark_adjust(98, 99, MAXLNUM, -2): delete lines
inserted = 0;
deleted = -amount_after;
}
diff_T *dprev = NULL;
diff_T *dp = tp->tp_first_diff;
linenr_T last;
linenr_T lnum_deleted = line1; // lnum of remaining deletion
int n;
int off;
for (;;) {
// If the change is after the previous diff block and before the next
// diff block, thus not touching an existing change, create a new diff
// block. Don't do this when ex_diffgetput() is busy.
if (((dp == NULL)
|| (dp->df_lnum[idx] - 1 > line2)
|| ((line2 == MAXLNUM) && (dp->df_lnum[idx] > line1)))
&& ((dprev == NULL)
|| (dprev->df_lnum[idx] + dprev->df_count[idx] < line1))
&& !diff_busy) {
diff_T *dnext = diff_alloc_new(tp, dprev, dp);
dnext->df_lnum[idx] = line1;
dnext->df_count[idx] = inserted;
int i;
for (i = 0; i < DB_COUNT; ++i) {
if ((tp->tp_diffbuf[i] != NULL) && (i != idx)) {
if (dprev == NULL) {
dnext->df_lnum[i] = line1;
} else {
dnext->df_lnum[i] = line1
+ (dprev->df_lnum[i] + dprev->df_count[i])
- (dprev->df_lnum[idx] + dprev->df_count[idx]);
}
dnext->df_count[i] = deleted;
}
}
}
// if at end of the list, quit
if (dp == NULL) {
break;
}
//
// Check for these situations:
// 1 2 3
// 1 2 3
// line1 2 3 4 5
// 2 3 4 5
// 2 3 4 5
// line2 2 3 4 5
// 3 5 6
// 3 5 6
// compute last line of this change
last = dp->df_lnum[idx] + dp->df_count[idx] - 1;
// 1. change completely above line1: nothing to do
if (last >= line1 - 1) {
// 6. change below line2: only adjust for amount_after; also when
// "deleted" became zero when deleted all lines between two diffs.
if (dp->df_lnum[idx] - (deleted + inserted != 0) > line2) {
if (amount_after == 0) {
// nothing left to change
break;
}
dp->df_lnum[idx] += amount_after;
} else {
int check_unchanged = false;
// 2. 3. 4. 5.: inserted/deleted lines touching this diff.
if (deleted > 0) {
if (dp->df_lnum[idx] >= line1) {
off = dp->df_lnum[idx] - lnum_deleted;
if (last <= line2) {
// 4. delete all lines of diff
if ((dp->df_next != NULL)
&& (dp->df_next->df_lnum[idx] - 1 <= line2)) {
// delete continues in next diff, only do
// lines until that one
n = dp->df_next->df_lnum[idx] - lnum_deleted;
deleted -= n;
n -= dp->df_count[idx];
lnum_deleted = dp->df_next->df_lnum[idx];
} else {
n = deleted - dp->df_count[idx];
}
dp->df_count[idx] = 0;
} else {
// 5. delete lines at or just before top of diff
n = off;
dp->df_count[idx] -= line2 - dp->df_lnum[idx] + 1;
check_unchanged = true;
}
dp->df_lnum[idx] = line1;
} else {
off = 0;
if (last < line2) {
// 2. delete at end of of diff
dp->df_count[idx] -= last - lnum_deleted + 1;
if ((dp->df_next != NULL)
&& (dp->df_next->df_lnum[idx] - 1 <= line2)) {
// delete continues in next diff, only do
// lines until that one
n = dp->df_next->df_lnum[idx] - 1 - last;
deleted -= dp->df_next->df_lnum[idx] - lnum_deleted;
lnum_deleted = dp->df_next->df_lnum[idx];
} else {
n = line2 - last;
}
check_unchanged = true;
} else {
// 3. delete lines inside the diff
n = 0;
dp->df_count[idx] -= deleted;
}
}
int i;
for (i = 0; i < DB_COUNT; ++i) {
if ((tp->tp_diffbuf[i] != NULL) && (i != idx)) {
dp->df_lnum[i] -= off;
dp->df_count[i] += n;
}
}
} else {
if (dp->df_lnum[idx] <= line1) {
// inserted lines somewhere in this diff
dp->df_count[idx] += inserted;
check_unchanged = true;
} else {
// inserted lines somewhere above this diff
dp->df_lnum[idx] += inserted;
}
}
if (check_unchanged) {
// Check if inserted lines are equal, may reduce the size of the
// diff.
//
// TODO: also check for equal lines in the middle and perhaps split
// the block.
diff_check_unchanged(tp, dp);
}
}
}
// check if this block touches the previous one, may merge them.
if ((dprev != NULL)
&& (dprev->df_lnum[idx] + dprev->df_count[idx] == dp->df_lnum[idx])) {
int i;
for (i = 0; i < DB_COUNT; ++i) {
if (tp->tp_diffbuf[i] != NULL) {
dprev->df_count[i] += dp->df_count[i];
}
}
dprev->df_next = dp->df_next;
xfree(dp);
dp = dprev->df_next;
} else {
// Advance to next entry.
dprev = dp;
dp = dp->df_next;
}
}
dprev = NULL;
dp = tp->tp_first_diff;
while (dp != NULL) {
// All counts are zero, remove this entry.
int i;
for (i = 0; i < DB_COUNT; ++i) {
if ((tp->tp_diffbuf[i] != NULL) && (dp->df_count[i] != 0)) {
break;
}
}
if (i == DB_COUNT) {
diff_T *dnext = dp->df_next;
xfree(dp);
dp = dnext;
if (dprev == NULL) {
tp->tp_first_diff = dnext;
} else {
dprev->df_next = dnext;
}
} else {
// Advance to next entry.
dprev = dp;
dp = dp->df_next;
}
}
if (tp == curtab) {
// Don't redraw right away, this updates the diffs, which can be slow.
need_diff_redraw = true;
// Need to recompute the scroll binding, may remove or add filler
// lines (e.g., when adding lines above w_topline). But it's slow when
// making many changes, postpone until redrawing.
diff_need_scrollbind = true;
}
}
/// Allocate a new diff block and link it between "dprev" and "dp".
///
/// @param tp
/// @param dprev
/// @param dp
///
/// @return The new diff block.
static diff_T* diff_alloc_new(tabpage_T *tp, diff_T *dprev, diff_T *dp)
{
diff_T *dnew = xmalloc(sizeof(*dnew));
dnew->df_next = dp;
if (dprev == NULL) {
tp->tp_first_diff = dnew;
} else {
dprev->df_next = dnew;
}
return dnew;
}
/// Check if the diff block "dp" can be made smaller for lines at the start and
/// end that are equal. Called after inserting lines.
///
/// This may result in a change where all buffers have zero lines, the caller
/// must take care of removing it.
///
/// @param tp
/// @param dp
static void diff_check_unchanged(tabpage_T *tp, diff_T *dp)
{
// Find the first buffers, use it as the original, compare the other
// buffer lines against this one.
int i_org;
for (i_org = 0; i_org < DB_COUNT; ++i_org) {
if (tp->tp_diffbuf[i_org] != NULL) {
break;
}
}
// safety check
if (i_org == DB_COUNT) {
return;
}
if (diff_check_sanity(tp, dp) == FAIL) {
return;
}
// First check lines at the top, then at the bottom.
int off_org = 0;
int off_new = 0;
int dir = FORWARD;
for (;;) {
// Repeat until a line is found which is different or the number of
// lines has become zero.
while (dp->df_count[i_org] > 0) {
// Copy the line, the next ml_get() will invalidate it.
if (dir == BACKWARD) {
off_org = dp->df_count[i_org] - 1;
}
char_u *line_org = vim_strsave(ml_get_buf(tp->tp_diffbuf[i_org],
dp->df_lnum[i_org] + off_org,
false));
int i_new;
for (i_new = i_org + 1; i_new < DB_COUNT; ++i_new) {
if (tp->tp_diffbuf[i_new] == NULL) {
continue;
}
if (dir == BACKWARD) {
off_new = dp->df_count[i_new] - 1;
}
// if other buffer doesn't have this line, it was inserted
if ((off_new < 0) || (off_new >= dp->df_count[i_new])) {
break;
}
if (diff_cmp(line_org, ml_get_buf(tp->tp_diffbuf[i_new],
dp->df_lnum[i_new] + off_new,
false)) != 0) {
break;
}
}
xfree(line_org);
// Stop when a line isn't equal in all diff buffers.
if (i_new != DB_COUNT) {
break;
}
// Line matched in all buffers, remove it from the diff.
for (i_new = i_org; i_new < DB_COUNT; ++i_new) {
if (tp->tp_diffbuf[i_new] != NULL) {
if (dir == FORWARD) {
dp->df_lnum[i_new]++;
}
dp->df_count[i_new]--;
}
}
}
if (dir == BACKWARD) {
break;
}
dir = BACKWARD;
}
}
/// Check if a diff block doesn't contain invalid line numbers.
/// This can happen when the diff program returns invalid results.
///
/// @param tp
/// @param dp
///
/// @return OK if the diff block doesn't contain invalid line numbers.
static int diff_check_sanity(tabpage_T *tp, diff_T *dp)
{
int i;
for (i = 0; i < DB_COUNT; ++i) {
if (tp->tp_diffbuf[i] != NULL) {
if (dp->df_lnum[i] + dp->df_count[i] - 1
> tp->tp_diffbuf[i]->b_ml.ml_line_count) {
return FAIL;
}
}
}
return OK;
}
/// Mark all diff buffers in the current tab page for redraw.
///
/// @param dofold Also recompute the folds
void diff_redraw(bool dofold)
{
need_diff_redraw = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if (!wp->w_p_diff) {
continue;
}
redraw_win_later(wp, SOME_VALID);
if (dofold && foldmethodIsDiff(wp)) {
foldUpdateAll(wp);
}
/* A change may have made filler lines invalid, need to take care
* of that for other windows. */
int n = diff_check(wp, wp->w_topline);
if (((wp != curwin) && (wp->w_topfill > 0)) || (n > 0)) {
if (wp->w_topfill > n) {
wp->w_topfill = (n < 0 ? 0 : n);
} else if ((n > 0) && (n > wp->w_topfill)) {
wp->w_topfill = n;
}
check_topfill(wp, false);
}
}
}
static void clear_diffin(diffin_T *din)
{
if (din->din_fname == NULL) {
XFREE_CLEAR(din->din_mmfile.ptr);
} else {
os_remove((char *)din->din_fname);
}
}
static void clear_diffout(diffout_T *dout)
{
if (dout->dout_fname == NULL) {
ga_clear_strings(&dout->dout_ga);
} else {
os_remove((char *)dout->dout_fname);
}
}
/// Write buffer "buf" to a memory buffer.
///
/// @param buf
/// @param din
///
/// @return FAIL for failure.
static int diff_write_buffer(buf_T *buf, diffin_T *din)
{
linenr_T lnum;
char_u *s;
long len = 0;
char_u *ptr;
// xdiff requires one big block of memory with all the text.
for (lnum = 1; lnum <= buf->b_ml.ml_line_count; lnum++) {
len += (long)STRLEN(ml_get_buf(buf, lnum, false)) + 1;
}
ptr = try_malloc(len);
if (ptr == NULL) {
// Allocating memory failed. This can happen, because we try to read
// the whole buffer text into memory. Set the failed flag, the diff
// will be retried with external diff. The flag is never reset.
buf->b_diff_failed = true;
if (p_verbose > 0) {
verbose_enter();
smsg(_("Not enough memory to use internal diff for buffer \"%s\""),
buf->b_fname);
verbose_leave();
}
return FAIL;
}
din->din_mmfile.ptr = (char *)ptr;
din->din_mmfile.size = len;
len = 0;
for (lnum = 1; lnum <= buf->b_ml.ml_line_count; lnum++) {
for (s = ml_get_buf(buf, lnum, false); *s != NUL; ) {
if (diff_flags & DIFF_ICASE) {
int c;
// xdiff doesn't support ignoring case, fold-case the text.
int orig_len;
char_u cbuf[MB_MAXBYTES + 1];
c = PTR2CHAR(s);
c = utf_fold(c);
orig_len = utfc_ptr2len(s);
if (utf_char2bytes(c, cbuf) != orig_len) {
// TODO(Bram): handle byte length difference
memmove(ptr + len, s, orig_len);
} else {
memmove(ptr + len, cbuf, orig_len);
}
s += orig_len;
len += orig_len;
} else {
ptr[len++] = *s++;
}
}
ptr[len++] = NL;
}
return OK;
}
/// Write buffer "buf" to file or memory buffer.
///
/// Always use 'fileformat' set to "unix".
///
/// @param buf
/// @param din
///
/// @return FAIL for failure
static int diff_write(buf_T *buf, diffin_T *din)
{
if (din->din_fname == NULL) {
return diff_write_buffer(buf, din);
}
// Always use 'fileformat' set to "unix".
char_u *save_ff = buf->b_p_ff;
buf->b_p_ff = vim_strsave((char_u *)FF_UNIX);
int r = buf_write(buf, din->din_fname, NULL,
(linenr_T)1, buf->b_ml.ml_line_count,
NULL, false, false, false, true);
free_string_option(buf->b_p_ff);
buf->b_p_ff = save_ff;
return r;
}
///
/// Update the diffs for all buffers involved.
///
/// @param dio
/// @param idx_orig
/// @param eap can be NULL
static void diff_try_update(diffio_T *dio,
int idx_orig,
exarg_T *eap)
{
buf_T *buf;
int idx_new;
if (dio->dio_internal) {
ga_init(&dio->dio_diff.dout_ga, sizeof(char *), 1000);
} else {
// We need three temp file names.
dio->dio_orig.din_fname = vim_tempname();
dio->dio_new.din_fname = vim_tempname();
dio->dio_diff.dout_fname = vim_tempname();
if (dio->dio_orig.din_fname == NULL
|| dio->dio_new.din_fname == NULL
|| dio->dio_diff.dout_fname == NULL) {
goto theend;
}
}
// Check external diff is actually working.
if (!dio->dio_internal && check_external_diff(dio) == FAIL) {
goto theend;
}
// :diffupdate!
if (eap != NULL && eap->forceit) {
for (idx_new = idx_orig; idx_new < DB_COUNT; idx_new++) {
buf = curtab->tp_diffbuf[idx_new];
if (buf_valid(buf)) {
buf_check_timestamp(buf, false);
}
}
}
// Write the first buffer to a tempfile or mmfile_t.
buf = curtab->tp_diffbuf[idx_orig];
if (diff_write(buf, &dio->dio_orig) == FAIL) {
goto theend;
}
// Make a difference between the first buffer and every other.
for (idx_new = idx_orig + 1; idx_new < DB_COUNT; idx_new++) {
buf = curtab->tp_diffbuf[idx_new];
if (buf == NULL || buf->b_ml.ml_mfp == NULL) {
continue; // skip buffer that isn't loaded
}
// Write the other buffer and diff with the first one.
if (diff_write(buf, &dio->dio_new) == FAIL) {
continue;
}
if (diff_file(dio) == FAIL) {
continue;
}
// Read the diff output and add each entry to the diff list.
diff_read(idx_orig, idx_new, &dio->dio_diff);
clear_diffin(&dio->dio_new);
clear_diffout(&dio->dio_diff);
}
clear_diffin(&dio->dio_orig);
theend:
xfree(dio->dio_orig.din_fname);
xfree(dio->dio_new.din_fname);
xfree(dio->dio_diff.dout_fname);
}
///
/// Return true if the options are set to use the internal diff library.
/// Note that if the internal diff failed for one of the buffers, the external
/// diff will be used anyway.
///
int diff_internal(void)
{
return (diff_flags & DIFF_INTERNAL) != 0 && *p_dex == NUL;
}
///
/// Return true if the internal diff failed for one of the diff buffers.
///
static int diff_internal_failed(void)
{
int idx;
// Only need to do something when there is another buffer.
for (idx = 0; idx < DB_COUNT; idx++) {
if (curtab->tp_diffbuf[idx] != NULL
&& curtab->tp_diffbuf[idx]->b_diff_failed) {
return true;
}
}
return false;
}
/// Completely update the diffs for the buffers involved.
///
/// When using the external "diff" command the buffers are written to a file,
/// also for unmodified buffers (the file could have been produced by
/// autocommands, e.g. the netrw plugin).
///
/// @param eap can be NULL
void ex_diffupdate(exarg_T *eap)
{
if (diff_busy) {
diff_need_update = true;
return;
}
int had_diffs = curtab->tp_first_diff != NULL;
// Delete all diffblocks.
diff_clear(curtab);
curtab->tp_diff_invalid = false;
// Use the first buffer as the original text.
int idx_orig;
for (idx_orig = 0; idx_orig < DB_COUNT; ++idx_orig) {
if (curtab->tp_diffbuf[idx_orig] != NULL) {
break;
}
}
if (idx_orig == DB_COUNT) {
goto theend;
}
// Only need to do something when there is another buffer.
int idx_new;
for (idx_new = idx_orig + 1; idx_new < DB_COUNT; ++idx_new) {
if (curtab->tp_diffbuf[idx_new] != NULL) {
break;
}
}
if (idx_new == DB_COUNT) {
goto theend;
}
// Only use the internal method if it did not fail for one of the buffers.
diffio_T diffio;
memset(&diffio, 0, sizeof(diffio));
diffio.dio_internal = diff_internal() && !diff_internal_failed();
diff_try_update(&diffio, idx_orig, eap);
if (diffio.dio_internal && diff_internal_failed()) {
// Internal diff failed, use external diff instead.
memset(&diffio, 0, sizeof(diffio));
diff_try_update(&diffio, idx_orig, eap);
}
// force updating cursor position on screen
curwin->w_valid_cursor.lnum = 0;
theend:
// A redraw is needed if there were diffs and they were cleared, or there
// are diffs now, which means they got updated.
if (had_diffs || curtab->tp_first_diff != NULL) {
diff_redraw(true);
apply_autocmds(EVENT_DIFFUPDATED, NULL, NULL, false, curbuf);
}
}
///
/// Do a quick test if "diff" really works. Otherwise it looks like there
/// are no differences. Can't use the return value, it's non-zero when
/// there are differences.
///
static int check_external_diff(diffio_T *diffio)
{
// May try twice, first with "-a" and then without.
int io_error = false;
TriState ok = kFalse;
for (;;) {
ok = kFalse;
FILE *fd = os_fopen((char *)diffio->dio_orig.din_fname, "w");
if (fd == NULL) {
io_error = true;
} else {
if (fwrite("line1\n", (size_t)6, (size_t)1, fd) != 1) {
io_error = true;
}
fclose(fd);
fd = os_fopen((char *)diffio->dio_new.din_fname, "w");
if (fd == NULL) {
io_error = true;
} else {
if (fwrite("line2\n", (size_t)6, (size_t)1, fd) != 1) {
io_error = true;
}
fclose(fd);
fd = NULL;
if (diff_file(diffio) == OK) {
fd = os_fopen((char *)diffio->dio_diff.dout_fname, "r");
}
if (fd == NULL) {
io_error = true;
} else {
char_u linebuf[LBUFLEN];
for (;;) {
// There must be a line that contains "1c1".
if (vim_fgets(linebuf, LBUFLEN, fd)) {
break;
}
if (STRNCMP(linebuf, "1c1", 3) == 0) {
ok = kTrue;
}
}
fclose(fd);
}
os_remove((char *)diffio->dio_diff.dout_fname);
os_remove((char *)diffio->dio_new.din_fname);
}
os_remove((char *)diffio->dio_orig.din_fname);
}
// When using 'diffexpr' break here.
if (*p_dex != NUL) {
break;
}
// If we checked if "-a" works already, break here.
if (diff_a_works != kNone) {
break;
}
diff_a_works = ok;
// If "-a" works break here, otherwise retry without "-a".
if (ok) {
break;
}
}
if (!ok) {
if (io_error) {
EMSG(_("E810: Cannot read or write temp files"));
}
EMSG(_("E97: Cannot create diffs"));
diff_a_works = kNone;
return FAIL;
}
return OK;
}
///
/// Invoke the xdiff function.
///
static int diff_file_internal(diffio_T *diffio)
{
xpparam_t param;
xdemitconf_t emit_cfg;
xdemitcb_t emit_cb;
memset(&param, 0, sizeof(param));
memset(&emit_cfg, 0, sizeof(emit_cfg));
memset(&emit_cb, 0, sizeof(emit_cb));
param.flags = diff_algorithm;
if (diff_flags & DIFF_IWHITE) {
param.flags |= XDF_IGNORE_WHITESPACE_CHANGE;
}
if (diff_flags & DIFF_IWHITEALL) {
param.flags |= XDF_IGNORE_WHITESPACE;
}
if (diff_flags & DIFF_IWHITEEOL) {
param.flags |= XDF_IGNORE_WHITESPACE_AT_EOL;
}
if (diff_flags & DIFF_IBLANK) {
param.flags |= XDF_IGNORE_BLANK_LINES;
}
emit_cfg.ctxlen = 0; // don't need any diff_context here
emit_cb.priv = &diffio->dio_diff;
emit_cb.outf = xdiff_out;
if (xdl_diff(&diffio->dio_orig.din_mmfile,
&diffio->dio_new.din_mmfile,
&param, &emit_cfg, &emit_cb) < 0) {
EMSG(_("E960: Problem creating the internal diff"));
return FAIL;
}
return OK;
}
/// Make a diff between files "tmp_orig" and "tmp_new", results in "tmp_diff".
///
/// @param dio
///
/// @return OK or FAIL
static int diff_file(diffio_T *dio)
{
char *tmp_orig = (char *)dio->dio_orig.din_fname;
char *tmp_new = (char *)dio->dio_new.din_fname;
char *tmp_diff = (char *)dio->dio_diff.dout_fname;
if (*p_dex != NUL) {
// Use 'diffexpr' to generate the diff file.
eval_diff(tmp_orig, tmp_new, tmp_diff);
return OK;
}
// Use xdiff for generating the diff.
if (dio->dio_internal) {
return diff_file_internal(dio);
} else {
const size_t len = (strlen(tmp_orig) + strlen(tmp_new) + strlen(tmp_diff)
+ STRLEN(p_srr) + 27);
char *const cmd = xmalloc(len);
// We don't want $DIFF_OPTIONS to get in the way.
if (os_getenv("DIFF_OPTIONS")) {
os_unsetenv("DIFF_OPTIONS");
}
// Build the diff command and execute it. Always use -a, binary
// differences are of no use. Ignore errors, diff returns
// non-zero when differences have been found.
vim_snprintf((char *)cmd, len, "diff %s%s%s%s%s%s%s%s %s",
diff_a_works == kFalse ? "" : "-a ",
"",
(diff_flags & DIFF_IWHITE) ? "-b " : "",
(diff_flags & DIFF_IWHITEALL) ? "-w " : "",
(diff_flags & DIFF_IWHITEEOL) ? "-Z " : "",
(diff_flags & DIFF_IBLANK) ? "-B " : "",
(diff_flags & DIFF_ICASE) ? "-i " : "",
tmp_orig, tmp_new);
append_redir(cmd, len, (char *) p_srr, tmp_diff);
block_autocmds(); // Avoid ShellCmdPost stuff
(void)call_shell((char_u *) cmd,
kShellOptFilter | kShellOptSilent | kShellOptDoOut,
NULL);
unblock_autocmds();
xfree(cmd);
return OK;
}
}
/// Create a new version of a file from the current buffer and a diff file.
///
/// The buffer is written to a file, also for unmodified buffers (the file
/// could have been produced by autocommands, e.g. the netrw plugin).
///
/// @param eap
void ex_diffpatch(exarg_T *eap)
{
char_u *buf = NULL;
win_T *old_curwin = curwin;
char_u *newname = NULL; // name of patched file buffer
char_u *esc_name = NULL;
#ifdef UNIX
char *fullname = NULL;
#endif
// We need two temp file names.
// Name of original temp file.
char_u *tmp_orig = vim_tempname();
// Name of patched temp file.
char_u *tmp_new = vim_tempname();
if ((tmp_orig == NULL) || (tmp_new == NULL)) {
goto theend;
}
// Write the current buffer to "tmp_orig".
if (buf_write(curbuf, tmp_orig, NULL,
(linenr_T)1, curbuf->b_ml.ml_line_count,
NULL, false, false, false, true) == FAIL) {
goto theend;
}
#ifdef UNIX
// Get the absolute path of the patchfile, changing directory below.
fullname = FullName_save((char *)eap->arg, false);
esc_name = vim_strsave_shellescape(
(fullname != NULL ? (char_u *)fullname : eap->arg), true, true);
#else
esc_name = vim_strsave_shellescape(eap->arg, true, true);
#endif
size_t buflen = STRLEN(tmp_orig) + STRLEN(esc_name) + STRLEN(tmp_new) + 16;
buf = xmalloc(buflen);
#ifdef UNIX
char_u dirbuf[MAXPATHL];
// Temporarily chdir to /tmp, to avoid patching files in the current
// directory when the patch file contains more than one patch. When we
// have our own temp dir use that instead, it will be cleaned up when we
// exit (any .rej files created). Don't change directory if we can't
// return to the current.
if ((os_dirname(dirbuf, MAXPATHL) != OK)
|| (os_chdir((char *)dirbuf) != 0)) {
dirbuf[0] = NUL;
} else {
char *tempdir = (char *)vim_gettempdir();
if (tempdir == NULL) {
tempdir = "/tmp";
}
os_chdir(tempdir);
shorten_fnames(true);
}
#endif
if (*p_pex != NUL) {
// Use 'patchexpr' to generate the new file.
#ifdef UNIX
eval_patch((char *)tmp_orig,
(fullname != NULL ? fullname : (char *)eap->arg),
(char *)tmp_new);
#else
eval_patch((char *)tmp_orig, (char *)eap->arg, (char *)tmp_new);
#endif
} else {
// Build the patch command and execute it. Ignore errors.
vim_snprintf((char *)buf, buflen, "patch -o %s %s < %s",
tmp_new, tmp_orig, esc_name);
block_autocmds(); // Avoid ShellCmdPost stuff
(void)call_shell(buf, kShellOptFilter, NULL);
unblock_autocmds();
}
#ifdef UNIX
if (dirbuf[0] != NUL) {
if (os_chdir((char *)dirbuf) != 0) {
EMSG(_(e_prev_dir));
}
shorten_fnames(true);
}
#endif
// Delete any .orig or .rej file created.
STRCPY(buf, tmp_new);
STRCAT(buf, ".orig");
os_remove((char *)buf);
STRCPY(buf, tmp_new);
STRCAT(buf, ".rej");
os_remove((char *)buf);
// Only continue if the output file was created.
FileInfo file_info;
bool info_ok = os_fileinfo((char *)tmp_new, &file_info);
uint64_t filesize = os_fileinfo_size(&file_info);
if (!info_ok || filesize == 0) {
EMSG(_("E816: Cannot read patch output"));
} else {
if (curbuf->b_fname != NULL) {
newname = vim_strnsave(curbuf->b_fname,
(int)(STRLEN(curbuf->b_fname) + 4));
STRCAT(newname, ".new");
}
// don't use a new tab page, each tab page has its own diffs
cmdmod.tab = 0;
if (win_split(0, (diff_flags & DIFF_VERTICAL) ? WSP_VERT : 0) != FAIL) {
// Pretend it was a ":split fname" command
eap->cmdidx = CMD_split;
eap->arg = tmp_new;
do_exedit(eap, old_curwin);
// check that split worked and editing tmp_new
if ((curwin != old_curwin) && win_valid(old_curwin)) {
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
diff_win_options(old_curwin, true);
if (newname != NULL) {
// do a ":file filename.new" on the patched buffer
eap->arg = newname;
ex_file(eap);
// Do filetype detection with the new name.
if (au_has_group((char_u *)"filetypedetect")) {
do_cmdline_cmd(":doau filetypedetect BufRead");
}
}
}
}
}
theend:
if (tmp_orig != NULL) {
os_remove((char *)tmp_orig);
}
xfree(tmp_orig);
if (tmp_new != NULL) {
os_remove((char *)tmp_new);
}
xfree(tmp_new);
xfree(newname);
xfree(buf);
#ifdef UNIX
xfree(fullname);
#endif
xfree(esc_name);
}
/// Split the window and edit another file, setting options to show the diffs.
///
/// @param eap
void ex_diffsplit(exarg_T *eap)
{
win_T *old_curwin = curwin;
bufref_T old_curbuf;
set_bufref(&old_curbuf, curbuf);
// Need to compute w_fraction when no redraw happened yet.
validate_cursor();
set_fraction(curwin);
// don't use a new tab page, each tab page has its own diffs
cmdmod.tab = 0;
if (win_split(0, (diff_flags & DIFF_VERTICAL) ? WSP_VERT : 0) != FAIL) {
// Pretend it was a ":split fname" command
eap->cmdidx = CMD_split;
curwin->w_p_diff = true;
do_exedit(eap, old_curwin);
// split must have worked
if (curwin != old_curwin) {
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
if (win_valid(old_curwin)) {
diff_win_options(old_curwin, true);
if (bufref_valid(&old_curbuf)) {
// Move the cursor position to that of the old window.
curwin->w_cursor.lnum = diff_get_corresponding_line(
old_curbuf.br_buf, old_curwin->w_cursor.lnum);
}
}
// Now that lines are folded scroll to show the cursor at the same
// relative position.
scroll_to_fraction(curwin, curwin->w_height);
}
}
}
// Set options to show diffs for the current window.
void ex_diffthis(exarg_T *eap)
{
// Set 'diff', 'scrollbind' on and 'wrap' off.
diff_win_options(curwin, true);
}
static void set_diff_option(win_T *wp, int value)
{
win_T *old_curwin = curwin;
curwin = wp;
curbuf = curwin->w_buffer;
curbuf_lock++;
set_option_value("diff", (long)value, NULL, OPT_LOCAL);
curbuf_lock--;
curwin = old_curwin;
curbuf = curwin->w_buffer;
}
/// Set options in window "wp" for diff mode.
///
/// @param addbuf Add buffer to diff.
void diff_win_options(win_T *wp, int addbuf)
{
win_T *old_curwin = curwin;
// close the manually opened folds
curwin = wp;
newFoldLevel();
curwin = old_curwin;
// Use 'scrollbind' and 'cursorbind' when available
if (!wp->w_p_diff) {
wp->w_p_scb_save = wp->w_p_scb;
}
wp->w_p_scb = true;
if (!wp->w_p_diff) {
wp->w_p_crb_save = wp->w_p_crb;
}
wp->w_p_crb = true;
if (!wp->w_p_diff) {
wp->w_p_wrap_save = wp->w_p_wrap;
}
wp->w_p_wrap = false;
curwin = wp; // -V519
curbuf = curwin->w_buffer;
if (!wp->w_p_diff) {
if (wp->w_p_diff_saved) {
free_string_option(wp->w_p_fdm_save);
}
wp->w_p_fdm_save = vim_strsave(wp->w_p_fdm);
}
set_string_option_direct((char_u *)"fdm", -1, (char_u *)"diff",
OPT_LOCAL | OPT_FREE, 0);
curwin = old_curwin;
curbuf = curwin->w_buffer;
if (!wp->w_p_diff) {
wp->w_p_fdc_save = wp->w_p_fdc;
wp->w_p_fen_save = wp->w_p_fen;
wp->w_p_fdl_save = wp->w_p_fdl;
}
wp->w_p_fdc = diff_foldcolumn;
wp->w_p_fen = true;
wp->w_p_fdl = 0;
foldUpdateAll(wp);
// make sure topline is not halfway through a fold
changed_window_setting_win(wp);
if (vim_strchr(p_sbo, 'h') == NULL) {
do_cmdline_cmd("set sbo+=hor");
}
// Save the current values, to be restored in ex_diffoff().
wp->w_p_diff_saved = true;
set_diff_option(wp, true);
if (addbuf) {
diff_buf_add(wp->w_buffer);
}
redraw_win_later(wp, NOT_VALID);
}
/// Set options not to show diffs. For the current window or all windows.
/// Only in the current tab page.
///
/// @param eap
void ex_diffoff(exarg_T *eap)
{
int diffwin = false;
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if (eap->forceit ? wp->w_p_diff : (wp == curwin)) {
// Set 'diff' off. If option values were saved in
// diff_win_options(), restore the ones whose settings seem to have
// been left over from diff mode.
set_diff_option(wp, false);
if (wp->w_p_diff_saved) {
if (wp->w_p_scb) {
wp->w_p_scb = wp->w_p_scb_save;
}
if (wp->w_p_crb) {
wp->w_p_crb = wp->w_p_crb_save;
}
if (!wp->w_p_wrap) {
wp->w_p_wrap = wp->w_p_wrap_save;
}
free_string_option(wp->w_p_fdm);
wp->w_p_fdm = vim_strsave(*wp->w_p_fdm_save
? wp->w_p_fdm_save
: (char_u *)"manual");
if (wp->w_p_fdc == diff_foldcolumn) {
wp->w_p_fdc = wp->w_p_fdc_save;
}
if (wp->w_p_fdl == 0) {
wp->w_p_fdl = wp->w_p_fdl_save;
}
// Only restore 'foldenable' when 'foldmethod' is not
// "manual", otherwise we continue to show the diff folds.
if (wp->w_p_fen) {
wp->w_p_fen = foldmethodIsManual(wp) ? false : wp->w_p_fen_save;
}
foldUpdateAll(wp);
}
// remove filler lines
wp->w_topfill = 0;
// make sure topline is not halfway a fold and cursor is
// invalidated
changed_window_setting_win(wp);
// Note: 'sbo' is not restored, it's a global option.
diff_buf_adjust(wp);
}
diffwin |= wp->w_p_diff;
}
// Also remove hidden buffers from the list.
if (eap->forceit) {
diff_buf_clear();
}
if (!diffwin) {
diff_need_update = false;
curtab->tp_diff_invalid = false;
curtab->tp_diff_update = false;
diff_clear(curtab);
}
// Remove "hor" from from 'scrollopt' if there are no diff windows left.
if (!diffwin && (vim_strchr(p_sbo, 'h') != NULL)) {
do_cmdline_cmd("set sbo-=hor");
}
}
/// Read the diff output and add each entry to the diff list.
///
/// @param idx_orig idx of original file
/// @param idx_new idx of new file
/// @dout diff output
static void diff_read(int idx_orig, int idx_new, diffout_T *dout)
{
FILE *fd = NULL;
int line_idx = 0;
diff_T *dprev = NULL;
diff_T *dp = curtab->tp_first_diff;
diff_T *dn, *dpl;
char_u linebuf[LBUFLEN]; // only need to hold the diff line
char_u *line;
long off;
int i;
linenr_T lnum_orig, lnum_new;
long count_orig, count_new;
int notset = true; // block "*dp" not set yet
enum {
DIFF_ED,
DIFF_UNIFIED,
DIFF_NONE
} diffstyle = DIFF_NONE;
if (dout->dout_fname == NULL) {
diffstyle = DIFF_UNIFIED;
} else {
fd = os_fopen((char *)dout->dout_fname, "r");
if (fd == NULL) {
EMSG(_("E98: Cannot read diff output"));
return;
}
}
for (;;) {
if (fd == NULL) {
if (line_idx >= dout->dout_ga.ga_len) {
break; // did last line
}
line = ((char_u **)dout->dout_ga.ga_data)[line_idx++];
} else {
if (vim_fgets(linebuf, LBUFLEN, fd)) {
break; // end of file
}
line = linebuf;
}
if (diffstyle == DIFF_NONE) {
// Determine diff style.
// ed like diff looks like this:
// {first}[,{last}]c{first}[,{last}]
// {first}a{first}[,{last}]
// {first}[,{last}]d{first}
//
// unified diff looks like this:
// --- file1 2018-03-20 13:23:35.783153140 +0100
// +++ file2 2018-03-20 13:23:41.183156066 +0100
// @@ -1,3 +1,5 @@
if (isdigit(*line)) {
diffstyle = DIFF_ED;
} else if ((STRNCMP(line, "@@ ", 3) == 0)) {
diffstyle = DIFF_UNIFIED;
} else if ((STRNCMP(line, "--- ", 4) == 0) // -V501
&& (vim_fgets(linebuf, LBUFLEN, fd) == 0) // -V501
&& (STRNCMP(line, "+++ ", 4) == 0)
&& (vim_fgets(linebuf, LBUFLEN, fd) == 0) // -V501
&& (STRNCMP(line, "@@ ", 3) == 0)) {
diffstyle = DIFF_UNIFIED;
} else {
// Format not recognized yet, skip over this line. Cygwin diff
// may put a warning at the start of the file.
continue;
}
}
if (diffstyle == DIFF_ED) {
if (!isdigit(*line)) {
continue; // not the start of a diff block
}
if (parse_diff_ed(line, &lnum_orig, &count_orig,
&lnum_new, &count_new) == FAIL) {
continue;
}
} else {
assert(diffstyle == DIFF_UNIFIED);
if (STRNCMP(line, "@@ ", 3) != 0) {
continue; // not the start of a diff block
}
if (parse_diff_unified(line, &lnum_orig, &count_orig,
&lnum_new, &count_new) == FAIL) {
continue;
}
}
// Go over blocks before the change, for which orig and new are equal.
// Copy blocks from orig to new.
while (dp != NULL
&& lnum_orig > dp->df_lnum[idx_orig] + dp->df_count[idx_orig]) {
if (notset) {
diff_copy_entry(dprev, dp, idx_orig, idx_new);
}
dprev = dp;
dp = dp->df_next;
notset = true;
}
if ((dp != NULL)
&& (lnum_orig <= dp->df_lnum[idx_orig] + dp->df_count[idx_orig])
&& (lnum_orig + count_orig >= dp->df_lnum[idx_orig])) {
// New block overlaps with existing block(s).
// First find last block that overlaps.
for (dpl = dp; dpl->df_next != NULL; dpl = dpl->df_next) {
if (lnum_orig + count_orig < dpl->df_next->df_lnum[idx_orig]) {
break;
}
}
// If the newly found block starts before the old one, set the
// start back a number of lines.
off = dp->df_lnum[idx_orig] - lnum_orig;
if (off > 0) {
for (i = idx_orig; i < idx_new; ++i) {
if (curtab->tp_diffbuf[i] != NULL) {
dp->df_lnum[i] -= off;
}
}
dp->df_lnum[idx_new] = lnum_new;
dp->df_count[idx_new] = count_new;
} else if (notset) {
// new block inside existing one, adjust new block
dp->df_lnum[idx_new] = lnum_new + off;
dp->df_count[idx_new] = count_new - off;
} else {
// second overlap of new block with existing block
dp->df_count[idx_new] += count_new - count_orig
+ dpl->df_lnum[idx_orig] +
dpl->df_count[idx_orig]
- (dp->df_lnum[idx_orig] +
dp->df_count[idx_orig]);
}
// Adjust the size of the block to include all the lines to the
// end of the existing block or the new diff, whatever ends last.
off = (lnum_orig + count_orig)
- (dpl->df_lnum[idx_orig] + dpl->df_count[idx_orig]);
if (off < 0) {
// new change ends in existing block, adjust the end if not
// done already
if (notset) {
dp->df_count[idx_new] += -off;
}
off = 0;
}
for (i = idx_orig; i < idx_new; ++i) {
if (curtab->tp_diffbuf[i] != NULL) {
dp->df_count[i] = dpl->df_lnum[i] + dpl->df_count[i]
- dp->df_lnum[i] + off;
}
}
// Delete the diff blocks that have been merged into one.
dn = dp->df_next;
dp->df_next = dpl->df_next;
while (dn != dp->df_next) {
dpl = dn->df_next;
xfree(dn);
dn = dpl;
}
} else {
// Allocate a new diffblock.
dp = diff_alloc_new(curtab, dprev, dp);
dp->df_lnum[idx_orig] = lnum_orig;
dp->df_count[idx_orig] = count_orig;
dp->df_lnum[idx_new] = lnum_new;
dp->df_count[idx_new] = count_new;
// Set values for other buffers, these must be equal to the
// original buffer, otherwise there would have been a change
// already.
for (i = idx_orig + 1; i < idx_new; ++i) {
if (curtab->tp_diffbuf[i] != NULL) {
diff_copy_entry(dprev, dp, idx_orig, i);
}
}
}
notset = false; // "*dp" has been set
}
// for remaining diff blocks orig and new are equal
while (dp != NULL) {
if (notset) {
diff_copy_entry(dprev, dp, idx_orig, idx_new);
}
dprev = dp;
dp = dp->df_next;
notset = true;
}
if (fd != NULL) {
fclose(fd);
}
}
/// Copy an entry at "dp" from "idx_orig" to "idx_new".
///
/// @param dprev
/// @param dp
/// @param idx_orig
/// @param idx_new
static void diff_copy_entry(diff_T *dprev, diff_T *dp, int idx_orig,
int idx_new)
{
long off;
if (dprev == NULL) {
off = 0;
} else {
off = (dprev->df_lnum[idx_orig] + dprev->df_count[idx_orig])
- (dprev->df_lnum[idx_new] + dprev->df_count[idx_new]);
}
dp->df_lnum[idx_new] = dp->df_lnum[idx_orig] - off;
dp->df_count[idx_new] = dp->df_count[idx_orig];
}
/// Clear the list of diffblocks for tab page "tp".
///
/// @param tp
void diff_clear(tabpage_T *tp)
FUNC_ATTR_NONNULL_ALL
{
diff_T *p;
diff_T *next_p;
for (p = tp->tp_first_diff; p != NULL; p = next_p) {
next_p = p->df_next;
xfree(p);
}
tp->tp_first_diff = NULL;
}
/// Check diff status for line "lnum" in buffer "buf":
///
/// Returns 0 for nothing special
/// Returns -1 for a line that should be highlighted as changed.
/// Returns -2 for a line that should be highlighted as added/deleted.
/// Returns > 0 for inserting that many filler lines above it (never happens
/// when 'diffopt' doesn't contain "filler").
/// This should only be used for windows where 'diff' is set.
///
/// @param wp
/// @param lnum
///
/// @return diff status.
int diff_check(win_T *wp, linenr_T lnum)
{
int idx; // index in tp_diffbuf[] for this buffer
diff_T *dp;
int maxcount;
int i;
buf_T *buf = wp->w_buffer;
int cmp;
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// no diffs at all
if ((curtab->tp_first_diff == NULL) || !wp->w_p_diff) {
return 0;
}
// safety check: "lnum" must be a buffer line
if ((lnum < 1) || (lnum > buf->b_ml.ml_line_count + 1)) {
return 0;
}
idx = diff_buf_idx(buf);
if (idx == DB_COUNT) {
// no diffs for buffer "buf"
return 0;
}
// A closed fold never has filler lines.
if (hasFoldingWin(wp, lnum, NULL, NULL, true, NULL)) {
return 0;
}
// search for a change that includes "lnum" in the list of diffblocks.
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
if ((dp == NULL) || (lnum < dp->df_lnum[idx])) {
return 0;
}
if (lnum < dp->df_lnum[idx] + dp->df_count[idx]) {
int zero = false;
// Changed or inserted line. If the other buffers have a count of
// zero, the lines were inserted. If the other buffers have the same
// count, check if the lines are identical.
cmp = false;
for (i = 0; i < DB_COUNT; ++i) {
if ((i != idx) && (curtab->tp_diffbuf[i] != NULL)) {
if (dp->df_count[i] == 0) {
zero = true;
} else {
if (dp->df_count[i] != dp->df_count[idx]) {
// nr of lines changed.
return -1;
}
cmp = true;
}
}
}
if (cmp) {
// Compare all lines. If they are equal the lines were inserted
// in some buffers, deleted in others, but not changed.
for (i = 0; i < DB_COUNT; ++i) {
if ((i != idx)
&& (curtab->tp_diffbuf[i] != NULL)
&& (dp->df_count[i] != 0)) {
if (!diff_equal_entry(dp, idx, i)) {
return -1;
}
}
}
}
// If there is no buffer with zero lines then there is no difference
// any longer. Happens when making a change (or undo) that removes
// the difference. Can't remove the entry here, we might be halfway
// through updating the window. Just report the text as unchanged.
// Other windows might still show the change though.
if (zero == false) {
return 0;
}
return -2;
}
// If 'diffopt' doesn't contain "filler", return 0.
if (!(diff_flags & DIFF_FILLER)) {
return 0;
}
// Insert filler lines above the line just below the change. Will return
// 0 when this buf had the max count.
maxcount = 0;
for (i = 0; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] != NULL) && (dp->df_count[i] > maxcount)) {
maxcount = dp->df_count[i];
}
}
return maxcount - dp->df_count[idx];
}
/// Compare two entries in diff "dp" and return true if they are equal.
///
/// @param dp diff
/// @param idx1 first entry in diff "dp"
/// @param idx2 second entry in diff "dp"
///
/// @return true if two entires are equal.
static bool diff_equal_entry(diff_T *dp, int idx1, int idx2)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
if (dp->df_count[idx1] != dp->df_count[idx2]) {
return false;
}
if (diff_check_sanity(curtab, dp) == FAIL) {
return false;
}
for (int i = 0; i < dp->df_count[idx1]; i++) {
char_u *line = vim_strsave(ml_get_buf(curtab->tp_diffbuf[idx1],
dp->df_lnum[idx1] + i, false));
int cmp = diff_cmp(line, ml_get_buf(curtab->tp_diffbuf[idx2],
dp->df_lnum[idx2] + i, false));
xfree(line);
if (cmp != 0) {
return false;
}
}
return true;
}
// Compare the characters at "p1" and "p2". If they are equal (possibly
// ignoring case) return true and set "len" to the number of bytes.
static bool diff_equal_char(const char_u *const p1, const char_u *const p2,
int *const len)
{
const int l = utfc_ptr2len(p1);
if (l != utfc_ptr2len(p2)) {
return false;
}
if (l > 1) {
if (STRNCMP(p1, p2, l) != 0
&& (!(diff_flags & DIFF_ICASE)
|| utf_fold(utf_ptr2char(p1)) != utf_fold(utf_ptr2char(p2)))) {
return false;
}
*len = l;
} else {
if ((*p1 != *p2)
&& (!(diff_flags & DIFF_ICASE)
|| TOLOWER_LOC(*p1) != TOLOWER_LOC(*p2))) {
return false;
}
*len = 1;
}
return true;
}
/// Compare strings "s1" and "s2" according to 'diffopt'.
/// Return non-zero when they are different.
///
/// @param s1 The first string
/// @param s2 The second string
///
/// @return on-zero if the two strings are different.
static int diff_cmp(char_u *s1, char_u *s2)
{
if ((diff_flags & DIFF_IBLANK)
&& (*skipwhite(s1) == NUL || *skipwhite(s2) == NUL)) {
return 0;
}
if ((diff_flags & (DIFF_ICASE | ALL_WHITE_DIFF)) == 0) {
return STRCMP(s1, s2);
}
if ((diff_flags & DIFF_ICASE) && !(diff_flags & ALL_WHITE_DIFF)) {
return mb_stricmp((const char *)s1, (const char *)s2);
}
char_u *p1 = s1;
char_u *p2 = s2;
// Ignore white space changes and possibly ignore case.
while (*p1 != NUL && *p2 != NUL) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(*p1) && ascii_iswhite(*p2))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(*p1) || ascii_iswhite(*p2)))) {
p1 = skipwhite(p1);
p2 = skipwhite(p2);
} else {
int l;
if (!diff_equal_char(p1, p2, &l)) {
break;
}
p1 += l;
p2 += l;
}
}
// Ignore trailing white space.
p1 = skipwhite(p1);
p2 = skipwhite(p2);
if ((*p1 != NUL) || (*p2 != NUL)) {
return 1;
}
return 0;
}
/// Return the number of filler lines above "lnum".
///
/// @param wp
/// @param lnum
///
/// @return Number of filler lines above lnum
int diff_check_fill(win_T *wp, linenr_T lnum)
{
// be quick when there are no filler lines
if (!(diff_flags & DIFF_FILLER)) {
return 0;
}
int n = diff_check(wp, lnum);
if (n <= 0) {
return 0;
}
return n;
}
/// Set the topline of "towin" to match the position in "fromwin", so that they
/// show the same diff'ed lines.
///
/// @param fromwin
/// @param towin
void diff_set_topline(win_T *fromwin, win_T *towin)
{
buf_T *frombuf = fromwin->w_buffer;
linenr_T lnum = fromwin->w_topline;
diff_T *dp;
int max_count;
int i;
int fromidx = diff_buf_idx(frombuf);
if (fromidx == DB_COUNT) {
// safety check
return;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
towin->w_topfill = 0;
// search for a change that includes "lnum" in the list of diffblocks.
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
break;
}
}
if (dp == NULL) {
// After last change, compute topline relative to end of file; no
// filler lines.
towin->w_topline = towin->w_buffer->b_ml.ml_line_count
- (frombuf->b_ml.ml_line_count - lnum);
} else {
// Find index for "towin".
int toidx = diff_buf_idx(towin->w_buffer);
if (toidx == DB_COUNT) {
// safety check
return;
}
towin->w_topline = lnum + (dp->df_lnum[toidx] - dp->df_lnum[fromidx]);
if (lnum >= dp->df_lnum[fromidx]) {
// Inside a change: compute filler lines. With three or more
// buffers we need to know the largest count.
max_count = 0;
for (i = 0; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] != NULL) && (max_count < dp->df_count[i])) {
max_count = dp->df_count[i];
}
}
if (dp->df_count[toidx] == dp->df_count[fromidx]) {
// same number of lines: use same filler count
towin->w_topfill = fromwin->w_topfill;
} else if (dp->df_count[toidx] > dp->df_count[fromidx]) {
if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
// more lines in towin and fromwin doesn't show diff
// lines, only filler lines
if (max_count - fromwin->w_topfill >= dp->df_count[toidx]) {
// towin also only shows filler lines
towin->w_topline = dp->df_lnum[toidx] + dp->df_count[toidx];
towin->w_topfill = fromwin->w_topfill;
} else {
// towin still has some diff lines to show
towin->w_topline = dp->df_lnum[toidx]
+ max_count - fromwin->w_topfill;
}
}
} else if (towin->w_topline >= dp->df_lnum[toidx]
+ dp->df_count[toidx]) {
// less lines in towin and no diff lines to show: compute
// filler lines
towin->w_topline = dp->df_lnum[toidx] + dp->df_count[toidx];
if (diff_flags & DIFF_FILLER) {
if (lnum == dp->df_lnum[fromidx] + dp->df_count[fromidx]) {
// fromwin is also out of diff lines
towin->w_topfill = fromwin->w_topfill;
} else {
// fromwin has some diff lines
towin->w_topfill = dp->df_lnum[fromidx] + max_count - lnum;
}
}
}
}
}
// safety check (if diff info gets outdated strange things may happen)
towin->w_botfill = false;
if (towin->w_topline > towin->w_buffer->b_ml.ml_line_count) {
towin->w_topline = towin->w_buffer->b_ml.ml_line_count;
towin->w_botfill = true;
}
if (towin->w_topline < 1) {
towin->w_topline = 1;
towin->w_topfill = 0;
}
// When w_topline changes need to recompute w_botline and cursor position
invalidate_botline_win(towin);
changed_line_abv_curs_win(towin);
check_topfill(towin, false);
(void)hasFoldingWin(towin, towin->w_topline, &towin->w_topline,
NULL, true, NULL);
}
/// This is called when 'diffopt' is changed.
///
/// @return
int diffopt_changed(void)
{
int diff_context_new = 6;
int diff_flags_new = 0;
int diff_foldcolumn_new = 2;
long diff_algorithm_new = 0;
long diff_indent_heuristic = 0;
char_u *p = p_dip;
while (*p != NUL) {
if (STRNCMP(p, "filler", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_FILLER;
} else if ((STRNCMP(p, "context:", 8) == 0) && ascii_isdigit(p[8])) {
p += 8;
diff_context_new = getdigits_int(&p, false, diff_context_new);
} else if (STRNCMP(p, "iblank", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_IBLANK;
} else if (STRNCMP(p, "icase", 5) == 0) {
p += 5;
diff_flags_new |= DIFF_ICASE;
} else if (STRNCMP(p, "iwhiteall", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_IWHITEALL;
} else if (STRNCMP(p, "iwhiteeol", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_IWHITEEOL;
} else if (STRNCMP(p, "iwhite", 6) == 0) {
p += 6;
diff_flags_new |= DIFF_IWHITE;
} else if (STRNCMP(p, "horizontal", 10) == 0) {
p += 10;
diff_flags_new |= DIFF_HORIZONTAL;
} else if (STRNCMP(p, "vertical", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_VERTICAL;
} else if ((STRNCMP(p, "foldcolumn:", 11) == 0) && ascii_isdigit(p[11])) {
p += 11;
diff_foldcolumn_new = getdigits_int(&p, false, diff_foldcolumn_new);
} else if (STRNCMP(p, "hiddenoff", 9) == 0) {
p += 9;
diff_flags_new |= DIFF_HIDDEN_OFF;
} else if (STRNCMP(p, "closeoff", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_CLOSE_OFF;
} else if (STRNCMP(p, "indent-heuristic", 16) == 0) {
p += 16;
diff_indent_heuristic = XDF_INDENT_HEURISTIC;
} else if (STRNCMP(p, "internal", 8) == 0) {
p += 8;
diff_flags_new |= DIFF_INTERNAL;
} else if (STRNCMP(p, "algorithm:", 10) == 0) {
p += 10;
if (STRNCMP(p, "myers", 5) == 0) {
p += 5;
diff_algorithm_new = 0;
} else if (STRNCMP(p, "minimal", 7) == 0) {
p += 7;
diff_algorithm_new = XDF_NEED_MINIMAL;
} else if (STRNCMP(p, "patience", 8) == 0) {
p += 8;
diff_algorithm_new = XDF_PATIENCE_DIFF;
} else if (STRNCMP(p, "histogram", 9) == 0) {
p += 9;
diff_algorithm_new = XDF_HISTOGRAM_DIFF;
} else {
return FAIL;
}
}
if ((*p != ',') && (*p != NUL)) {
return FAIL;
}
if (*p == ',') {
++p;
}
}
diff_algorithm_new |= diff_indent_heuristic;
// Can't have both "horizontal" and "vertical".
if ((diff_flags_new & DIFF_HORIZONTAL) && (diff_flags_new & DIFF_VERTICAL)) {
return FAIL;
}
// If flags were added or removed, or the algorithm was changed, need to
// update the diff.
if (diff_flags != diff_flags_new || diff_algorithm != diff_algorithm_new) {
FOR_ALL_TABS(tp) {
tp->tp_diff_invalid = true;
}
}
diff_flags = diff_flags_new;
diff_context = diff_context_new == 0 ? 1 : diff_context_new;
diff_foldcolumn = diff_foldcolumn_new;
diff_algorithm = diff_algorithm_new;
diff_redraw(true);
// recompute the scroll binding with the new option value, may
// remove or add filler lines
check_scrollbind((linenr_T)0, 0L);
return OK;
}
/// Check that "diffopt" contains "horizontal".
bool diffopt_horizontal(void)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
return (diff_flags & DIFF_HORIZONTAL) != 0;
}
// Return true if 'diffopt' contains "hiddenoff".
bool diffopt_hiddenoff(void)
{
return (diff_flags & DIFF_HIDDEN_OFF) != 0;
}
// Return true if 'diffopt' contains "closeoff".
bool diffopt_closeoff(void)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
{
return (diff_flags & DIFF_CLOSE_OFF) != 0;
}
/// Find the difference within a changed line.
///
/// @param wp window whose current buffer to check
/// @param lnum line number to check within the buffer
/// @param startp first char of the change
/// @param endp last char of the change
///
/// @return true if the line was added, no other buffer has it.
bool diff_find_change(win_T *wp, linenr_T lnum, int *startp, int *endp)
FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ALL
{
char_u *line_new;
int si_org;
int si_new;
int ei_org;
int ei_new;
bool added = true;
int l;
// Make a copy of the line, the next ml_get() will invalidate it.
char_u *line_org = vim_strsave(ml_get_buf(wp->w_buffer, lnum, false));
int idx = diff_buf_idx(wp->w_buffer);
if (idx == DB_COUNT) {
// cannot happen
xfree(line_org);
return false;
}
// search for a change that includes "lnum" in the list of diffblocks.
diff_T *dp;
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
if ((dp == NULL) || (diff_check_sanity(curtab, dp) == FAIL)) {
xfree(line_org);
return false;
}
int off = lnum - dp->df_lnum[idx];
int i;
for (i = 0; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] != NULL) && (i != idx)) {
// Skip lines that are not in the other change (filler lines).
if (off >= dp->df_count[i]) {
continue;
}
added = false;
line_new = ml_get_buf(curtab->tp_diffbuf[i],
dp->df_lnum[i] + off, false);
// Search for start of difference
si_org = si_new = 0;
while (line_org[si_org] != NUL) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(line_org[si_org])
&& ascii_iswhite(line_new[si_new]))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(line_org[si_org])
|| ascii_iswhite(line_new[si_new])))) {
si_org = (int)(skipwhite(line_org + si_org) - line_org);
si_new = (int)(skipwhite(line_new + si_new) - line_new);
} else {
if (!diff_equal_char(line_org + si_org, line_new + si_new, &l)) {
break;
}
si_org += l;
si_new += l;
}
}
// Move back to first byte of character in both lines (may
// have "nn^" in line_org and "n^ in line_new).
si_org -= utf_head_off(line_org, line_org + si_org);
si_new -= utf_head_off(line_new, line_new + si_new);
if (*startp > si_org) {
*startp = si_org;
}
// Search for end of difference, if any.
if ((line_org[si_org] != NUL) || (line_new[si_new] != NUL)) {
ei_org = (int)STRLEN(line_org);
ei_new = (int)STRLEN(line_new);
while (ei_org >= *startp
&& ei_new >= si_new
&& ei_org >= 0
&& ei_new >= 0) {
if (((diff_flags & DIFF_IWHITE)
&& ascii_iswhite(line_org[ei_org])
&& ascii_iswhite(line_new[ei_new]))
|| ((diff_flags & DIFF_IWHITEALL)
&& (ascii_iswhite(line_org[ei_org])
|| ascii_iswhite(line_new[ei_new])))) {
while (ei_org >= *startp && ascii_iswhite(line_org[ei_org])) {
ei_org--;
}
while (ei_new >= si_new && ascii_iswhite(line_new[ei_new])) {
ei_new--;
}
} else {
const char_u *p1 = line_org + ei_org;
const char_u *p2 = line_new + ei_new;
p1 -= utf_head_off(line_org, p1);
p2 -= utf_head_off(line_new, p2);
if (!diff_equal_char(p1, p2, &l)) {
break;
}
ei_org -= l;
ei_new -= l;
}
}
if (*endp < ei_org) {
*endp = ei_org;
}
}
}
}
xfree(line_org);
return added;
}
/// Check that line "lnum" is not close to a diff block, this line should
/// be in a fold.
///
/// @param wp window containing the buffer to check
/// @param lnum line number to check within the buffer
///
/// @return false if there are no diff blocks at all in this window.
bool diff_infold(win_T *wp, linenr_T lnum)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
bool other = false;
diff_T *dp;
// Return if 'diff' isn't set.
if (!wp->w_p_diff) {
return false;
}
int idx = -1;
int i;
for (i = 0; i < DB_COUNT; ++i) {
if (curtab->tp_diffbuf[i] == wp->w_buffer) {
idx = i;
} else if (curtab->tp_diffbuf[i] != NULL) {
other = true;
}
}
// return here if there are no diffs in the window
if ((idx == -1) || !other) {
return false;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// Return if there are no diff blocks. All lines will be folded.
if (curtab->tp_first_diff == NULL) {
return true;
}
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
// If this change is below the line there can't be any further match.
if (dp->df_lnum[idx] - diff_context > lnum) {
break;
}
// If this change ends before the line we have a match.
if (dp->df_lnum[idx] + dp->df_count[idx] + diff_context > lnum) {
return false;
}
}
return true;
}
/// "dp" and "do" commands.
void nv_diffgetput(bool put, size_t count)
{
exarg_T ea;
char buf[30];
if (bt_prompt(curbuf)) {
vim_beep(BO_OPER);
return;
}
if (count == 0) {
ea.arg = (char_u *)"";
} else {
vim_snprintf(buf, 30, "%zu", count);
ea.arg = (char_u *)buf;
}
if (put) {
ea.cmdidx = CMD_diffput;
} else {
ea.cmdidx = CMD_diffget;
}
ea.addr_count = 0;
ea.line1 = curwin->w_cursor.lnum;
ea.line2 = curwin->w_cursor.lnum;
ex_diffgetput(&ea);
}
/// ":diffget" and ":diffput"
///
/// @param eap
void ex_diffgetput(exarg_T *eap)
{
linenr_T lnum;
int count;
linenr_T off = 0;
diff_T *dp;
diff_T *dprev;
diff_T *dfree;
int i;
int added;
char_u *p;
aco_save_T aco;
buf_T *buf;
int start_skip, end_skip;
int new_count;
int buf_empty;
int found_not_ma = false;
int idx_other;
int idx_from;
int idx_to;
// Find the current buffer in the list of diff buffers.
int idx_cur = diff_buf_idx(curbuf);
if (idx_cur == DB_COUNT) {
EMSG(_("E99: Current buffer is not in diff mode"));
return;
}
if (*eap->arg == NUL) {
// No argument: Find the other buffer in the list of diff buffers.
for (idx_other = 0; idx_other < DB_COUNT; ++idx_other) {
if ((curtab->tp_diffbuf[idx_other] != curbuf)
&& (curtab->tp_diffbuf[idx_other] != NULL)) {
if ((eap->cmdidx != CMD_diffput)
|| MODIFIABLE(curtab->tp_diffbuf[idx_other])) {
break;
}
found_not_ma = true;
}
}
if (idx_other == DB_COUNT) {
if (found_not_ma) {
EMSG(_("E793: No other buffer in diff mode is modifiable"));
} else {
EMSG(_("E100: No other buffer in diff mode"));
}
return;
}
// Check that there isn't a third buffer in the list
for (i = idx_other + 1; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] != curbuf)
&& (curtab->tp_diffbuf[i] != NULL)
&& ((eap->cmdidx != CMD_diffput)
|| MODIFIABLE(curtab->tp_diffbuf[i]))) {
EMSG(_("E101: More than two buffers in diff mode, don't know "
"which one to use"));
return;
}
}
} else {
// Buffer number or pattern given. Ignore trailing white space.
p = eap->arg + STRLEN(eap->arg);
while (p > eap->arg && ascii_iswhite(p[-1])) {
p--;
}
for (i = 0; ascii_isdigit(eap->arg[i]) && eap->arg + i < p; ++i) {
}
if (eap->arg + i == p) {
// digits only
i = atol((char *)eap->arg);
} else {
i = buflist_findpat(eap->arg, p, false, true, false);
if (i < 0) {
// error message already given
return;
}
}
buf = buflist_findnr(i);
if (buf == NULL) {
EMSG2(_("E102: Can't find buffer \"%s\""), eap->arg);
return;
}
if (buf == curbuf) {
// nothing to do
return;
}
idx_other = diff_buf_idx(buf);
if (idx_other == DB_COUNT) {
EMSG2(_("E103: Buffer \"%s\" is not in diff mode"), eap->arg);
return;
}
}
diff_busy = true;
// When no range given include the line above or below the cursor.
if (eap->addr_count == 0) {
// Make it possible that ":diffget" on the last line gets line below
// the cursor line when there is no difference above the cursor.
if ((eap->cmdidx == CMD_diffget)
&& (eap->line1 == curbuf->b_ml.ml_line_count)
&& (diff_check(curwin, eap->line1) == 0)
&& ((eap->line1 == 1) || (diff_check(curwin, eap->line1 - 1) == 0))) {
++eap->line2;
} else if (eap->line1 > 0) {
--eap->line1;
}
}
if (eap->cmdidx == CMD_diffget) {
idx_from = idx_other;
idx_to = idx_cur;
} else {
idx_from = idx_cur;
idx_to = idx_other;
// Need to make the other buffer the current buffer to be able to make
// changes in it.
// set curwin/curbuf to buf and save a few things
aucmd_prepbuf(&aco, curtab->tp_diffbuf[idx_other]);
}
// May give the warning for a changed buffer here, which can trigger the
// FileChangedRO autocommand, which may do nasty things and mess
// everything up.
if (!curbuf->b_changed) {
change_warning(0);
if (diff_buf_idx(curbuf) != idx_to) {
EMSG(_("E787: Buffer changed unexpectedly"));
goto theend;
}
}
dprev = NULL;
for (dp = curtab->tp_first_diff; dp != NULL;) {
if (dp->df_lnum[idx_cur] > eap->line2 + off) {
// past the range that was specified
break;
}
dfree = NULL;
lnum = dp->df_lnum[idx_to];
count = dp->df_count[idx_to];
if ((dp->df_lnum[idx_cur] + dp->df_count[idx_cur] > eap->line1 + off)
&& (u_save(lnum - 1, lnum + count) != FAIL)) {
// Inside the specified range and saving for undo worked.
start_skip = 0;
end_skip = 0;
if (eap->addr_count > 0) {
// A range was specified: check if lines need to be skipped.
start_skip = eap->line1 + off - dp->df_lnum[idx_cur];
if (start_skip > 0) {
// range starts below start of current diff block
if (start_skip > count) {
lnum += count;
count = 0;
} else {
count -= start_skip;
lnum += start_skip;
}
} else {
start_skip = 0;
}
end_skip = dp->df_lnum[idx_cur] + dp->df_count[idx_cur] - 1
- (eap->line2 + off);
if (end_skip > 0) {
// range ends above end of current/from diff block
if (idx_cur == idx_from) {
// :diffput
i = dp->df_count[idx_cur] - start_skip - end_skip;
if (count > i) {
count = i;
}
} else {
// :diffget
count -= end_skip;
end_skip = dp->df_count[idx_from] - start_skip - count;
if (end_skip < 0) {
end_skip = 0;
}
}
} else {
end_skip = 0;
}
}
buf_empty = BUFEMPTY();
added = 0;
for (i = 0; i < count; ++i) {
// remember deleting the last line of the buffer
buf_empty = curbuf->b_ml.ml_line_count == 1;
ml_delete(lnum, false);
added--;
}
for (i = 0; i < dp->df_count[idx_from] - start_skip - end_skip; ++i) {
linenr_T nr = dp->df_lnum[idx_from] + start_skip + i;
if (nr > curtab->tp_diffbuf[idx_from]->b_ml.ml_line_count) {
break;
}
p = vim_strsave(ml_get_buf(curtab->tp_diffbuf[idx_from], nr, false));
ml_append(lnum + i - 1, p, 0, false);
xfree(p);
added++;
if (buf_empty && (curbuf->b_ml.ml_line_count == 2)) {
// Added the first line into an empty buffer, need to
// delete the dummy empty line.
buf_empty = false;
ml_delete((linenr_T)2, false);
}
}
new_count = dp->df_count[idx_to] + added;
dp->df_count[idx_to] = new_count;
if ((start_skip == 0) && (end_skip == 0)) {
// Check if there are any other buffers and if the diff is
// equal in them.
for (i = 0; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] != NULL)
&& (i != idx_from)
&& (i != idx_to)
&& !diff_equal_entry(dp, idx_from, i)) {
break;
}
}
if (i == DB_COUNT) {
// delete the diff entry, the buffers are now equal here
dfree = dp;
dp = dp->df_next;
if (dprev == NULL) {
curtab->tp_first_diff = dp;
} else {
dprev->df_next = dp;
}
}
}
// Adjust marks. This will change the following entries!
if (added != 0) {
mark_adjust(lnum, lnum + count - 1, (long)MAXLNUM, (long)added,
kExtmarkUndo);
if (curwin->w_cursor.lnum >= lnum) {
// Adjust the cursor position if it's in/after the changed
// lines.
if (curwin->w_cursor.lnum >= lnum + count) {
curwin->w_cursor.lnum += added;
} else if (added < 0) {
curwin->w_cursor.lnum = lnum;
}
}
}
changed_lines(lnum, 0, lnum + count, (long)added, true);
if (dfree != NULL) {
// Diff is deleted, update folds in other windows.
diff_fold_update(dfree, idx_to);
xfree(dfree);
} else {
// mark_adjust() may have changed the count in a wrong way
dp->df_count[idx_to] = new_count;
}
// When changing the current buffer, keep track of line numbers
if (idx_cur == idx_to) {
off += added;
}
}
// If before the range or not deleted, go to next diff.
if (dfree == NULL) {
dprev = dp;
dp = dp->df_next;
}
}
// restore curwin/curbuf and a few other things
if (eap->cmdidx != CMD_diffget) {
// Syncing undo only works for the current buffer, but we change
// another buffer. Sync undo if the command was typed. This isn't
// 100% right when ":diffput" is used in a function or mapping.
if (KeyTyped) {
u_sync(false);
}
aucmd_restbuf(&aco);
}
theend:
diff_busy = false;
if (diff_need_update) {
ex_diffupdate(NULL);
}
// Check that the cursor is on a valid character and update its
// position. When there were filler lines the topline has become
// invalid.
check_cursor();
changed_line_abv_curs();
if (diff_need_update) {
// redraw already done by ex_diffupdate()
diff_need_update = false;
} else {
// Also need to redraw the other buffers.
diff_redraw(false);
apply_autocmds(EVENT_DIFFUPDATED, NULL, NULL, false, curbuf);
}
}
/// Update folds for all diff buffers for entry "dp".
///
/// Skip buffer with index "skip_idx".
/// When there are no diffs, all folds are removed.
///
/// @param dp
/// @param skip_idx
static void diff_fold_update(diff_T *dp, int skip_idx)
{
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
for (int i = 0; i < DB_COUNT; ++i) {
if ((curtab->tp_diffbuf[i] == wp->w_buffer) && (i != skip_idx)) {
foldUpdate(wp, dp->df_lnum[i], dp->df_lnum[i] + dp->df_count[i]);
}
}
}
}
/// Checks that the buffer is in diff-mode.
///
/// @param buf buffer to check.
bool diff_mode_buf(buf_T *buf)
FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT FUNC_ATTR_NONNULL_ARG(1)
{
FOR_ALL_TABS(tp) {
if (diff_buf_idx_tp(buf, tp) != DB_COUNT) {
return true;
}
}
return false;
}
/// Move "count" times in direction "dir" to the next diff block.
///
/// @param dir
/// @param count
///
/// @return FAIL if there isn't such a diff block.
int diff_move_to(int dir, long count)
{
linenr_T lnum = curwin->w_cursor.lnum;
int idx = diff_buf_idx(curbuf);
if ((idx == DB_COUNT) || (curtab->tp_first_diff == NULL)) {
return FAIL;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
if (curtab->tp_first_diff == NULL) {
// no diffs today
return FAIL;
}
while (--count >= 0) {
// Check if already before first diff.
if ((dir == BACKWARD) && (lnum <= curtab->tp_first_diff->df_lnum[idx])) {
break;
}
diff_T *dp;
for (dp = curtab->tp_first_diff;; dp = dp->df_next) {
if (dp == NULL) {
break;
}
if (((dir == FORWARD) && (lnum < dp->df_lnum[idx]))
|| ((dir == BACKWARD)
&& ((dp->df_next == NULL)
|| (lnum <= dp->df_next->df_lnum[idx])))) {
lnum = dp->df_lnum[idx];
break;
}
}
}
// don't end up past the end of the file
if (lnum > curbuf->b_ml.ml_line_count) {
lnum = curbuf->b_ml.ml_line_count;
}
// When the cursor didn't move at all we fail.
if (lnum == curwin->w_cursor.lnum) {
return FAIL;
}
setpcmark();
curwin->w_cursor.lnum = lnum;
curwin->w_cursor.col = 0;
return OK;
}
/// Return the line number in the current window that is closest to "lnum1" in
/// "buf1" in diff mode.
static linenr_T diff_get_corresponding_line_int(buf_T *buf1, linenr_T lnum1)
{
int idx1;
int idx2;
diff_T *dp;
int baseline = 0;
idx1 = diff_buf_idx(buf1);
idx2 = diff_buf_idx(curbuf);
if ((idx1 == DB_COUNT)
|| (idx2 == DB_COUNT)
|| (curtab->tp_first_diff == NULL)) {
return lnum1;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
if (curtab->tp_first_diff == NULL) {
// no diffs today
return lnum1;
}
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (dp->df_lnum[idx1] > lnum1) {
return lnum1 - baseline;
}
if ((dp->df_lnum[idx1] + dp->df_count[idx1]) > lnum1) {
// Inside the diffblock
baseline = lnum1 - dp->df_lnum[idx1];
if (baseline > dp->df_count[idx2]) {
baseline = dp->df_count[idx2];
}
return dp->df_lnum[idx2] + baseline;
}
if ((dp->df_lnum[idx1] == lnum1)
&& (dp->df_count[idx1] == 0)
&& (dp->df_lnum[idx2] <= curwin->w_cursor.lnum)
&& ((dp->df_lnum[idx2] + dp->df_count[idx2])
> curwin->w_cursor.lnum)) {
// Special case: if the cursor is just after a zero-count
// block (i.e. all filler) and the target cursor is already
// inside the corresponding block, leave the target cursor
// unmoved. This makes repeated CTRL-W W operations work
// as expected.
return curwin->w_cursor.lnum;
}
baseline = (dp->df_lnum[idx1] + dp->df_count[idx1])
- (dp->df_lnum[idx2] + dp->df_count[idx2]);
}
// If we get here then the cursor is after the last diff
return lnum1 - baseline;
}
/// Finds the corresponding line in a diff.
///
/// @param buf1
/// @param lnum1
///
/// @return The corresponding line.
linenr_T diff_get_corresponding_line(buf_T *buf1, linenr_T lnum1)
{
linenr_T lnum = diff_get_corresponding_line_int(buf1, lnum1);
// don't end up past the end of the file
if (lnum > curbuf->b_ml.ml_line_count) {
return curbuf->b_ml.ml_line_count;
}
return lnum;
}
/// For line "lnum" in the current window find the equivalent lnum in window
/// "wp", compensating for inserted/deleted lines.
linenr_T diff_lnum_win(linenr_T lnum, win_T *wp)
{
diff_T *dp;
int idx;
int i;
linenr_T n;
idx = diff_buf_idx(curbuf);
if (idx == DB_COUNT) {
// safety check
return (linenr_T)0;
}
if (curtab->tp_diff_invalid) {
// update after a big change
ex_diffupdate(NULL);
}
// search for a change that includes "lnum" in the list of diffblocks.
for (dp = curtab->tp_first_diff; dp != NULL; dp = dp->df_next) {
if (lnum <= dp->df_lnum[idx] + dp->df_count[idx]) {
break;
}
}
// When after the last change, compute relative to the last line number.
if (dp == NULL) {
return wp->w_buffer->b_ml.ml_line_count
- (curbuf->b_ml.ml_line_count - lnum);
}
// Find index for "wp".
i = diff_buf_idx(wp->w_buffer);
if (i == DB_COUNT) {
// safety check
return (linenr_T)0;
}
n = lnum + (dp->df_lnum[i] - dp->df_lnum[idx]);
if (n > dp->df_lnum[i] + dp->df_count[i]) {
n = dp->df_lnum[i] + dp->df_count[i];
}
return n;
}
///
/// Handle an ED style diff line.
/// Return FAIL if the line does not contain diff info.
///
static int parse_diff_ed(char_u *line,
linenr_T *lnum_orig,
long *count_orig,
linenr_T *lnum_new,
long *count_new)
{
char_u *p;
long f1, l1, f2, l2;
int difftype;
// The line must be one of three formats:
// change: {first}[,{last}]c{first}[,{last}]
// append: {first}a{first}[,{last}]
// delete: {first}[,{last}]d{first}
p = line;
f1 = getdigits(&p, true, 0);
if (*p == ',') {
p++;
l1 = getdigits(&p, true, 0);
} else {
l1 = f1;
}
if (*p != 'a' && *p != 'c' && *p != 'd') {
return FAIL; // invalid diff format
}
difftype = *p++;
f2 = getdigits(&p, true, 0);
if (*p == ',') {
p++;
l2 = getdigits(&p, true, 0);
} else {
l2 = f2;
}
if (l1 < f1 || l2 < f2) {
return FAIL;
}
if (difftype == 'a') {
*lnum_orig = f1 + 1;
*count_orig = 0;
} else {
*lnum_orig = f1;
*count_orig = l1 - f1 + 1;
}
if (difftype == 'd') {
*lnum_new = f2 + 1;
*count_new = 0;
} else {
*lnum_new = f2;
*count_new = l2 - f2 + 1;
}
return OK;
}
///
/// Parses unified diff with zero(!) context lines.
/// Return FAIL if there is no diff information in "line".
///
static int parse_diff_unified(char_u *line,
linenr_T *lnum_orig,
long *count_orig,
linenr_T *lnum_new,
long *count_new)
{
char_u *p;
long oldline, oldcount, newline, newcount;
// Parse unified diff hunk header:
// @@ -oldline,oldcount +newline,newcount @@
p = line;
if (*p++ == '@' && *p++ == '@' && *p++ == ' ' && *p++ == '-') {
oldline = getdigits(&p, true, 0);
if (*p == ',') {
p++;
oldcount = getdigits(&p, true, 0);
} else {
oldcount = 1;
}
if (*p++ == ' ' && *p++ == '+') {
newline = getdigits(&p, true, 0);
if (*p == ',') {
p++;
newcount = getdigits(&p, true, 0);
} else {
newcount = 1;
}
} else {
return FAIL; // invalid diff format
}
if (oldcount == 0) {
oldline += 1;
}
if (newcount == 0) {
newline += 1;
}
if (newline == 0) {
newline = 1;
}
*lnum_orig = oldline;
*count_orig = oldcount;
*lnum_new = newline;
*count_new = newcount;
return OK;
}
return FAIL;
}
///
/// Callback function for the xdl_diff() function.
/// Stores the diff output in a grow array.
///
static int xdiff_out(void *priv, mmbuffer_t *mb, int nbuf)
{
diffout_T *dout = (diffout_T *)priv;
char_u *p;
// The header line always comes by itself, text lines in at least two
// parts. We drop the text part.
if (nbuf > 1) {
return 0;
}
// sanity check
if (STRNCMP(mb[0].ptr, "@@ ", 3) != 0) {
return 0;
}
ga_grow(&dout->dout_ga, 1);
p = vim_strnsave((char_u *)mb[0].ptr, mb[0].size);
((char_u **)dout->dout_ga.ga_data)[dout->dout_ga.ga_len++] = p;
return 0;
}
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