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fuchsia / third_party / vim / 6768a3305a9bc0e10aabafcf2a211ebaf1721f73 / . / src / diff.c
blob: 33dd48344398bd71cea5fd1a658d020949bd17cb [file] [log] [blame]
/* vim:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* diff.c: code for diff'ing two or three buffers.
*/
#include "vim.h"
#if defined(FEAT_DIFF) || defined(PROTO)
static int diff_busy = FALSE; /* ex_diffgetput() is busy */
/* flags obtained from the 'diffopt' option */
#define DIFF_FILLER 1 /* display filler lines */
#define DIFF_ICASE 2 /* ignore case */
#define DIFF_IWHITE 4 /* ignore change in white space */
#define DIFF_HORIZONTAL 8 /* horizontal splits */
#define DIFF_VERTICAL 16 /* vertical splits */
static int diff_flags = DIFF_FILLER;
#define LBUFLEN 50 /* length of line in diff file */
static int diff_a_works = MAYBE; /* TRUE when "diff -a" works, FALSE when it
doesn't work, MAYBE when not checked yet */
#if defined(MSWIN) || defined(MSDOS)
static int diff_bin_works = MAYBE; /* TRUE when "diff --binary" works, FALSE
when it doesn't work, MAYBE when not
checked yet */
#endif
static int diff_buf_idx __ARGS((buf_T *buf));
static int diff_buf_idx_tp __ARGS((buf_T *buf, tabpage_T *tp));
static void diff_mark_adjust_tp __ARGS((tabpage_T *tp, int idx, linenr_T line1, linenr_T line2, long amount, long amount_after));
static void diff_check_unchanged __ARGS((tabpage_T *tp, diff_T *dp));
static int diff_check_sanity __ARGS((tabpage_T *tp, diff_T *dp));
static void diff_redraw __ARGS((int dofold));
static int diff_write __ARGS((buf_T *buf, char_u *fname));
static void diff_file __ARGS((char_u *tmp_orig, char_u *tmp_new, char_u *tmp_diff));
static int diff_equal_entry __ARGS((diff_T *dp, int idx1, int idx2));
static int diff_cmp __ARGS((char_u *s1, char_u *s2));
#ifdef FEAT_FOLDING
static void diff_fold_update __ARGS((diff_T *dp, int skip_idx));
#endif
static void diff_read __ARGS((int idx_orig, int idx_new, char_u *fname));
static void diff_copy_entry __ARGS((diff_T *dprev, diff_T *dp, int idx_orig, int idx_new));
static diff_T *diff_alloc_new __ARGS((tabpage_T *tp, diff_T *dprev, diff_T *dp));
#ifndef USE_CR
# define tag_fgets vim_fgets
#endif
/*
* Called when deleting or unloading a buffer: No longer make a diff with it.
*/
void
diff_buf_delete(buf)
buf_T *buf;
{
int i;
tabpage_T *tp;
for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
{
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.
*/
void
diff_buf_adjust(win)
win_T *win;
{
win_T *wp;
int i;
if (!win->w_p_diff)
{
/* When there is no window showing a diff for this buffer, remove
* it from the diffs. */
for (wp = firstwin; wp != NULL; wp = wp->w_next)
if (wp->w_buffer == win->w_buffer && wp->w_p_diff)
break;
if (wp == NULL)
{
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 requireing updating.
* This must be done before any autocmd, because a command may use info
* about the screen contents.
*/
void
diff_buf_add(buf)
buf_T *buf;
{
int i;
if (diff_buf_idx(buf) != DB_COUNT)
return; /* It's already there. */
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: Can not diff more than %ld buffers"), DB_COUNT);
}
/*
* Find buffer "buf" in the list of diff buffers for the current tab page.
* Return its index or DB_COUNT if not found.
*/
static int
diff_buf_idx(buf)
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".
* Return its index or DB_COUNT if not found.
*/
static int
diff_buf_idx_tp(buf, 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.
*/
void
diff_invalidate(buf)
buf_T *buf;
{
tabpage_T *tp;
int i;
for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
{
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".
*/
void
diff_mark_adjust(line1, line2, amount, amount_after)
linenr_T line1;
linenr_T line2;
long amount;
long amount_after;
{
int idx;
tabpage_T *tp;
/* Handle all tab pages that use the current buffer in a diff. */
for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
{
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.
*/
static void
diff_mark_adjust_tp(tp, idx, line1, line2, amount, amount_after)
tabpage_T *tp;
int idx;
linenr_T line1;
linenr_T line2;
long amount;
long amount_after;
{
diff_T *dp;
diff_T *dprev;
diff_T *dnext;
int i;
int inserted, deleted;
int n, off;
linenr_T last;
linenr_T lnum_deleted = line1; /* lnum of remaining deletion */
int check_unchanged;
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;
}
dprev = NULL;
dp = tp->tp_first_diff;
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)
{
dnext = diff_alloc_new(tp, dprev, dp);
if (dnext == NULL)
return;
dnext->df_lnum[idx] = line1;
dnext->df_count[idx] = inserted;
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)
break; /* nothing left to change */
dp->df_lnum[idx] += amount_after;
}
else
{
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;
}
}
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])
{
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;
vim_free(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. */
for (i = 0; i < DB_COUNT; ++i)
if (tp->tp_diffbuf[i] != NULL && dp->df_count[i] != 0)
break;
if (i == DB_COUNT)
{
dnext = dp->df_next;
vim_free(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)
{
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".
*/
static diff_T *
diff_alloc_new(tp, dprev, dp)
tabpage_T *tp;
diff_T *dprev;
diff_T *dp;
{
diff_T *dnew;
dnew = (diff_T *)alloc((unsigned)sizeof(diff_T));
if (dnew != NULL)
{
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.
*/
static void
diff_check_unchanged(tp, dp)
tabpage_T *tp;
diff_T *dp;
{
int i_org;
int i_new;
int off_org, off_new;
char_u *line_org;
int dir = FORWARD;
/* Find the first buffers, use it as the original, compare the other
* buffer lines against this one. */
for (i_org = 0; i_org < DB_COUNT; ++i_org)
if (tp->tp_diffbuf[i_org] != NULL)
break;
if (i_org == DB_COUNT) /* safety check */
return;
if (diff_check_sanity(tp, dp) == FAIL)
return;
/* First check lines at the top, then at the bottom. */
off_org = 0;
off_new = 0;
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;
line_org = vim_strsave(ml_get_buf(tp->tp_diffbuf[i_org],
dp->df_lnum[i_org] + off_org, FALSE));
if (line_org == NULL)
return;
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;
}
vim_free(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.
*/
static int
diff_check_sanity(tp, dp)
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.
*/
static void
diff_redraw(dofold)
int dofold; /* also recompute the folds */
{
win_T *wp;
int n;
for (wp = firstwin; wp != NULL; wp = wp->w_next)
if (wp->w_p_diff)
{
redraw_win_later(wp, SOME_VALID);
#ifdef FEAT_FOLDING
if (dofold && foldmethodIsDiff(wp))
foldUpdateAll(wp);
#endif
/* A change may have made filler lines invalid, need to take care
* of that for other windows. */
if (wp != curwin && wp->w_topfill > 0)
{
n = diff_check(wp, wp->w_topline);
if (wp->w_topfill > n)
wp->w_topfill = (n < 0 ? 0 : n);
}
}
}
/*
* Write buffer "buf" to file "name".
* Always use 'fileformat' set to "unix".
* Return FAIL for failure
*/
static int
diff_write(buf, fname)
buf_T *buf;
char_u *fname;
{
int r;
char_u *save_ff;
save_ff = buf->b_p_ff;
buf->b_p_ff = vim_strsave((char_u *)FF_UNIX);
r = buf_write(buf, 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;
}
/*
* Completely update the diffs for the buffers involved.
* This uses the ordinary "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).
*/
/*ARGSUSED*/
void
ex_diffupdate(eap)
exarg_T *eap; /* can be NULL, it's not used */
{
buf_T *buf;
int idx_orig;
int idx_new;
char_u *tmp_orig;
char_u *tmp_new;
char_u *tmp_diff;
FILE *fd;
int ok;
int io_error = FALSE;
/* Delete all diffblocks. */
diff_clear(curtab);
curtab->tp_diff_invalid = FALSE;
/* Use the first buffer as the original text. */
for (idx_orig = 0; idx_orig < DB_COUNT; ++idx_orig)
if (curtab->tp_diffbuf[idx_orig] != NULL)
break;
if (idx_orig == DB_COUNT)
return;
/* Only need to do something when there is another buffer. */
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)
return;
/* We need three temp file names. */
tmp_orig = vim_tempname('o');
tmp_new = vim_tempname('n');
tmp_diff = vim_tempname('d');
if (tmp_orig == NULL || tmp_new == NULL || tmp_diff == NULL)
goto theend;
/*
* 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.
* May try twice, first with "-a" and then without.
*/
for (;;)
{
ok = FALSE;
fd = mch_fopen((char *)tmp_orig, "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 = mch_fopen((char *)tmp_new, "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);
diff_file(tmp_orig, tmp_new, tmp_diff);
fd = mch_fopen((char *)tmp_diff, "r");
if (fd == NULL)
io_error = TRUE;
else
{
char_u linebuf[LBUFLEN];
for (;;)
{
/* There must be a line that contains "1c1". */
if (tag_fgets(linebuf, LBUFLEN, fd))
break;
if (STRNCMP(linebuf, "1c1", 3) == 0)
ok = TRUE;
}
fclose(fd);
}
mch_remove(tmp_diff);
mch_remove(tmp_new);
}
mch_remove(tmp_orig);
}
#ifdef FEAT_EVAL
/* When using 'diffexpr' break here. */
if (*p_dex != NUL)
break;
#endif
#if defined(MSWIN) || defined(MSDOS)
/* If the "-a" argument works, also check if "--binary" works. */
if (ok && diff_a_works == MAYBE && diff_bin_works == MAYBE)
{
diff_a_works = TRUE;
diff_bin_works = TRUE;
continue;
}
if (!ok && diff_a_works == TRUE && diff_bin_works == TRUE)
{
/* Tried --binary, but it failed. "-a" works though. */
diff_bin_works = FALSE;
ok = TRUE;
}
#endif
/* If we checked if "-a" works already, break here. */
if (diff_a_works != MAYBE)
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 = MAYBE;
#if defined(MSWIN) || defined(MSDOS)
diff_bin_works = MAYBE;
#endif
goto theend;
}
/* Write the first buffer to a tempfile. */
buf = curtab->tp_diffbuf[idx_orig];
if (diff_write(buf, tmp_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)
continue;
if (diff_write(buf, tmp_new) == FAIL)
continue;
diff_file(tmp_orig, tmp_new, tmp_diff);
/* Read the diff output and add each entry to the diff list. */
diff_read(idx_orig, idx_new, tmp_diff);
mch_remove(tmp_diff);
mch_remove(tmp_new);
}
mch_remove(tmp_orig);
/* force updating cursor position on screen */
curwin->w_valid_cursor.lnum = 0;
diff_redraw(TRUE);
theend:
vim_free(tmp_orig);
vim_free(tmp_new);
vim_free(tmp_diff);
}
/*
* Make a diff between files "tmp_orig" and "tmp_new", results in "tmp_diff".
*/
static void
diff_file(tmp_orig, tmp_new, tmp_diff)
char_u *tmp_orig;
char_u *tmp_new;
char_u *tmp_diff;
{
char_u *cmd;
#ifdef FEAT_EVAL
if (*p_dex != NUL)
/* Use 'diffexpr' to generate the diff file. */
eval_diff(tmp_orig, tmp_new, tmp_diff);
else
#endif
{
cmd = alloc((unsigned)(STRLEN(tmp_orig) + STRLEN(tmp_new)
+ STRLEN(tmp_diff) + STRLEN(p_srr) + 27));
if (cmd != NULL)
{
/* We don't want $DIFF_OPTIONS to get in the way. */
if (getenv("DIFF_OPTIONS"))
vim_setenv((char_u *)"DIFF_OPTIONS", (char_u *)"");
/* 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. */
sprintf((char *)cmd, "diff %s%s%s%s%s %s",
diff_a_works == FALSE ? "" : "-a ",
#if defined(MSWIN) || defined(MSDOS)
diff_bin_works == TRUE ? "--binary " : "",
#else
"",
#endif
(diff_flags & DIFF_IWHITE) ? "-b " : "",
(diff_flags & DIFF_ICASE) ? "-i " : "",
tmp_orig, tmp_new);
append_redir(cmd, p_srr, tmp_diff);
#ifdef FEAT_AUTOCMD
block_autocmds(); /* Avoid ShellCmdPost stuff */
#endif
(void)call_shell(cmd, SHELL_FILTER|SHELL_SILENT|SHELL_DOOUT);
#ifdef FEAT_AUTOCMD
unblock_autocmds();
#endif
vim_free(cmd);
}
}
}
/*
* 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).
*/
void
ex_diffpatch(eap)
exarg_T *eap;
{
char_u *tmp_orig; /* name of original temp file */
char_u *tmp_new; /* name of patched temp file */
char_u *buf = NULL;
win_T *old_curwin = curwin;
char_u *newname = NULL; /* name of patched file buffer */
#ifdef UNIX
char_u dirbuf[MAXPATHL];
char_u *fullname = NULL;
#endif
#ifdef FEAT_BROWSE
char_u *browseFile = NULL;
int browse_flag = cmdmod.browse;
#endif
#ifdef FEAT_BROWSE
if (cmdmod.browse)
{
browseFile = do_browse(0, (char_u *)_("Patch file"),
eap->arg, NULL, NULL, BROWSE_FILTER_ALL_FILES, NULL);
if (browseFile == NULL)
return; /* operation cancelled */
eap->arg = browseFile;
cmdmod.browse = FALSE; /* don't let do_ecmd() browse again */
}
#endif
/* We need two temp file names. */
tmp_orig = vim_tempname('o');
tmp_new = vim_tempname('n');
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(eap->arg, FALSE);
#endif
buf = alloc((unsigned)(STRLEN(tmp_orig) + (
# ifdef UNIX
fullname != NULL ? STRLEN(fullname) :
# endif
STRLEN(eap->arg)) + STRLEN(tmp_new) + 16));
if (buf == NULL)
goto theend;
#ifdef UNIX
/* Temporaraly 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 (mch_dirname(dirbuf, MAXPATHL) != OK || mch_chdir((char *)dirbuf) != 0)
dirbuf[0] = NUL;
else
{
# ifdef TEMPDIRNAMES
if (vim_tempdir != NULL)
ignored = mch_chdir((char *)vim_tempdir);
else
# endif
ignored = mch_chdir("/tmp");
shorten_fnames(TRUE);
}
#endif
#ifdef FEAT_EVAL
if (*p_pex != NUL)
/* Use 'patchexpr' to generate the new file. */
eval_patch(tmp_orig,
# ifdef UNIX
fullname != NULL ? fullname :
# endif
eap->arg, tmp_new);
else
#endif
{
/* Build the patch command and execute it. Ignore errors. Switch to
* cooked mode to allow the user to respond to prompts. */
sprintf((char *)buf, "patch -o %s %s < \"%s\"", tmp_new, tmp_orig,
# ifdef UNIX
fullname != NULL ? fullname :
# endif
eap->arg);
#ifdef FEAT_AUTOCMD
block_autocmds(); /* Avoid ShellCmdPost stuff */
#endif
(void)call_shell(buf, SHELL_FILTER | SHELL_COOKED);
#ifdef FEAT_AUTOCMD
unblock_autocmds();
#endif
}
#ifdef UNIX
if (dirbuf[0] != NUL)
{
if (mch_chdir((char *)dirbuf) != 0)
EMSG(_(e_prev_dir));
shorten_fnames(TRUE);
}
#endif
/* patch probably has written over the screen */
redraw_later(CLEAR);
/* Delete any .orig or .rej file created. */
STRCPY(buf, tmp_new);
STRCAT(buf, ".orig");
mch_remove(buf);
STRCPY(buf, tmp_new);
STRCAT(buf, ".rej");
mch_remove(buf);
if (curbuf->b_fname != NULL)
{
newname = vim_strnsave(curbuf->b_fname,
(int)(STRLEN(curbuf->b_fname) + 4));
if (newname != NULL)
STRCAT(newname, ".new");
}
#ifdef FEAT_GUI
need_mouse_correct = TRUE;
#endif
/* 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);
if (curwin != old_curwin) /* split must have worked */
{
/* 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);
#ifdef FEAT_AUTOCMD
/* Do filetype detection with the new name. */
if (au_has_group((char_u *)"filetypedetect"))
do_cmdline_cmd((char_u *)":doau filetypedetect BufRead");
#endif
}
}
}
theend:
if (tmp_orig != NULL)
mch_remove(tmp_orig);
vim_free(tmp_orig);
if (tmp_new != NULL)
mch_remove(tmp_new);
vim_free(tmp_new);
vim_free(newname);
vim_free(buf);
#ifdef UNIX
vim_free(fullname);
#endif
#ifdef FEAT_BROWSE
vim_free(browseFile);
cmdmod.browse = browse_flag;
#endif
}
/*
* Split the window and edit another file, setting options to show the diffs.
*/
void
ex_diffsplit(eap)
exarg_T *eap;
{
win_T *old_curwin = curwin;
#ifdef FEAT_GUI
need_mouse_correct = TRUE;
#endif
/* 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);
if (curwin != old_curwin) /* split must have worked */
{
/* Set 'diff', 'scrollbind' on and 'wrap' off. */
diff_win_options(curwin, TRUE);
diff_win_options(old_curwin, TRUE);
}
}
}
/*
* Set options to show difs for the current window.
*/
/*ARGSUSED*/
void
ex_diffthis(eap)
exarg_T *eap;
{
/* Set 'diff', 'scrollbind' on and 'wrap' off. */
diff_win_options(curwin, TRUE);
}
/*
* Set options in window "wp" for diff mode.
*/
void
diff_win_options(wp, addbuf)
win_T *wp;
int addbuf; /* Add buffer to diff. */
{
wp->w_p_diff = TRUE;
wp->w_p_scb = TRUE;
wp->w_p_wrap = FALSE;
# ifdef FEAT_FOLDING
{
win_T *old_curwin = curwin;
curwin = wp;
curbuf = curwin->w_buffer;
set_string_option_direct((char_u *)"fdm", -1, (char_u *)"diff",
OPT_LOCAL|OPT_FREE, 0);
curwin = old_curwin;
curbuf = curwin->w_buffer;
wp->w_p_fdc = diff_foldcolumn;
wp->w_p_fen = TRUE;
wp->w_p_fdl = 0;
foldUpdateAll(wp);
/* make sure topline is not halfway a fold */
changed_window_setting_win(wp);
}
# endif
#ifdef FEAT_SCROLLBIND
if (vim_strchr(p_sbo, 'h') == NULL)
do_cmdline_cmd((char_u *)"set sbo+=hor");
#endif
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.
*/
void
ex_diffoff(eap)
exarg_T *eap;
{
win_T *wp;
win_T *old_curwin = curwin;
#ifdef FEAT_SCROLLBIND
int diffwin = FALSE;
#endif
for (wp = firstwin; wp != NULL; wp = wp->w_next)
{
if (wp == curwin || eap->forceit)
{
/* Set 'diff', 'scrollbind' off and 'wrap' on. */
wp->w_p_diff = FALSE;
wp->w_p_scb = FALSE;
wp->w_p_wrap = TRUE;
#ifdef FEAT_FOLDING
curwin = wp;
curbuf = curwin->w_buffer;
set_string_option_direct((char_u *)"fdm", -1,
(char_u *)"manual", OPT_LOCAL|OPT_FREE, 0);
curwin = old_curwin;
curbuf = curwin->w_buffer;
wp->w_p_fdc = 0;
wp->w_p_fen = FALSE;
wp->w_p_fdl = 0;
foldUpdateAll(wp);
/* make sure topline is not halfway a fold */
changed_window_setting_win(wp);
#endif
diff_buf_adjust(wp);
}
#ifdef FEAT_SCROLLBIND
diffwin |= wp->w_p_diff;
#endif
}
#ifdef FEAT_SCROLLBIND
/* Remove "hor" from from 'scrollopt' if there are no diff windows left. */
if (!diffwin && vim_strchr(p_sbo, 'h') != NULL)
do_cmdline_cmd((char_u *)"set sbo-=hor");
#endif
}
/*
* Read the diff output and add each entry to the diff list.
*/
static void
diff_read(idx_orig, idx_new, fname)
int idx_orig; /* idx of original file */
int idx_new; /* idx of new file */
char_u *fname; /* name of diff output file */
{
FILE *fd;
diff_T *dprev = NULL;
diff_T *dp = curtab->tp_first_diff;
diff_T *dn, *dpl;
long f1, l1, f2, l2;
char_u linebuf[LBUFLEN]; /* only need to hold the diff line */
int difftype;
char_u *p;
long off;
int i;
linenr_T lnum_orig, lnum_new;
long count_orig, count_new;
int notset = TRUE; /* block "*dp" not set yet */
fd = mch_fopen((char *)fname, "r");
if (fd == NULL)
{
EMSG(_("E98: Cannot read diff output"));
return;
}
for (;;)
{
if (tag_fgets(linebuf, LBUFLEN, fd))
break; /* end of file */
if (!isdigit(*linebuf))
continue; /* not the start of a diff block */
/* This line must be one of three formats:
* {first}[,{last}]c{first}[,{last}]
* {first}a{first}[,{last}]
* {first}[,{last}]d{first}
*/
p = linebuf;
f1 = getdigits(&p);
if (*p == ',')
{
++p;
l1 = getdigits(&p);
}
else
l1 = f1;
if (*p != 'a' && *p != 'c' && *p != 'd')
continue; /* invalid diff format */
difftype = *p++;
f2 = getdigits(&p);
if (*p == ',')
{
++p;
l2 = getdigits(&p);
}
else
l2 = f2;
if (l1 < f1 || l2 < f2)
continue; /* invalid line range */
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;
}
/* 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;
vim_free(dn);
dn = dpl;
}
}
else
{
/* Allocate a new diffblock. */
dp = diff_alloc_new(curtab, dprev, dp);
if (dp == NULL)
goto done;
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;
}
done:
fclose(fd);
}
/*
* Copy an entry at "dp" from "idx_orig" to "idx_new".
*/
static void
diff_copy_entry(dprev, dp, idx_orig, idx_new)
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".
*/
void
diff_clear(tp)
tabpage_T *tp;
{
diff_T *p, *next_p;
for (p = tp->tp_first_diff; p != NULL; p = next_p)
{
next_p = p->df_next;
vim_free(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.
*/
int
diff_check(wp, lnum)
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)
ex_diffupdate(NULL); /* update after a big change */
if (curtab->tp_first_diff == NULL || !wp->w_p_diff) /* no diffs at all */
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)
return 0; /* no diffs for buffer "buf" */
#ifdef FEAT_FOLDING
/* A closed fold never has filler lines. */
if (hasFoldingWin(wp, lnum, NULL, NULL, TRUE, NULL))
return 0;
#endif
/* 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])
return -1; /* nr of lines changed. */
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
* 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.
*/
static int
diff_equal_entry(dp, idx1, idx2)
diff_T *dp;
int idx1;
int idx2;
{
int i;
char_u *line;
int cmp;
if (dp->df_count[idx1] != dp->df_count[idx2])
return FALSE;
if (diff_check_sanity(curtab, dp) == FAIL)
return FALSE;
for (i = 0; i < dp->df_count[idx1]; ++i)
{
line = vim_strsave(ml_get_buf(curtab->tp_diffbuf[idx1],
dp->df_lnum[idx1] + i, FALSE));
if (line == NULL)
return FALSE;
cmp = diff_cmp(line, ml_get_buf(curtab->tp_diffbuf[idx2],
dp->df_lnum[idx2] + i, FALSE));
vim_free(line);
if (cmp != 0)
return FALSE;
}
return TRUE;
}
/*
* Compare strings "s1" and "s2" according to 'diffopt'.
* Return non-zero when they are different.
*/
static int
diff_cmp(s1, s2)
char_u *s1;
char_u *s2;
{
char_u *p1, *p2;
#ifdef FEAT_MBYTE
int l;
#endif
if ((diff_flags & (DIFF_ICASE | DIFF_IWHITE)) == 0)
return STRCMP(s1, s2);
if ((diff_flags & DIFF_ICASE) && !(diff_flags & DIFF_IWHITE))
return MB_STRICMP(s1, s2);
/* Ignore white space changes and possibly ignore case. */
p1 = s1;
p2 = s2;
while (*p1 != NUL && *p2 != NUL)
{
if (vim_iswhite(*p1) && vim_iswhite(*p2))
{
p1 = skipwhite(p1);
p2 = skipwhite(p2);
}
else
{
#ifdef FEAT_MBYTE
l = (*mb_ptr2len)(p1);
if (l != (*mb_ptr2len)(p2))
break;
if (l > 1)
{
if (STRNCMP(p1, p2, l) != 0
&& (!enc_utf8
|| !(diff_flags & DIFF_ICASE)
|| utf_fold(utf_ptr2char(p1))
!= utf_fold(utf_ptr2char(p2))))
break;
p1 += l;
p2 += l;
}
else
#endif
{
if (*p1 != *p2 && (!(diff_flags & DIFF_ICASE)
|| TOLOWER_LOC(*p1) != TOLOWER_LOC(*p2)))
break;
++p1;
++p2;
}
}
}
/* 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".
*/
int
diff_check_fill(wp, lnum)
win_T *wp;
linenr_T lnum;
{
int n;
/* be quick when there are no filler lines */
if (!(diff_flags & DIFF_FILLER))
return 0;
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.
*/
void
diff_set_topline(fromwin, towin)
win_T *fromwin;
win_T *towin;
{
buf_T *frombuf = fromwin->w_buffer;
linenr_T lnum = fromwin->w_topline;
int fromidx;
int toidx;
diff_T *dp;
int max_count;
int i;
fromidx = diff_buf_idx(frombuf);
if (fromidx == DB_COUNT)
return; /* safety check */
if (curtab->tp_diff_invalid)
ex_diffupdate(NULL); /* update after a big change */
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". */
toidx = diff_buf_idx(towin->w_buffer);
if (toidx == DB_COUNT)
return; /* safety check */
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);
#ifdef FEAT_FOLDING
(void)hasFoldingWin(towin, towin->w_topline, &towin->w_topline,
NULL, TRUE, NULL);
#endif
}
/*
* This is called when 'diffopt' is changed.
*/
int
diffopt_changed()
{
char_u *p;
int diff_context_new = 6;
int diff_flags_new = 0;
int diff_foldcolumn_new = 2;
tabpage_T *tp;
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 && VIM_ISDIGIT(p[8]))
{
p += 8;
diff_context_new = getdigits(&p);
}
else if (STRNCMP(p, "icase", 5) == 0)
{
p += 5;
diff_flags_new |= DIFF_ICASE;
}
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 && VIM_ISDIGIT(p[11]))
{
p += 11;
diff_foldcolumn_new = getdigits(&p);
}
if (*p != ',' && *p != NUL)
return FAIL;
if (*p == ',')
++p;
}
/* Can't have both "horizontal" and "vertical". */
if ((diff_flags_new & DIFF_HORIZONTAL) && (diff_flags_new & DIFF_VERTICAL))
return FAIL;
/* If "icase" or "iwhite" was added or removed, need to update the diff. */
if (diff_flags != diff_flags_new)
for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
tp->tp_diff_invalid = TRUE;
diff_flags = diff_flags_new;
diff_context = diff_context_new;
diff_foldcolumn = diff_foldcolumn_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;
}
/*
* Return TRUE if 'diffopt' contains "horizontal".
*/
int
diffopt_horizontal()
{
return (diff_flags & DIFF_HORIZONTAL) != 0;
}
/*
* Find the difference within a changed line.
* Returns TRUE if the line was added, no other buffer has it.
*/
int
diff_find_change(wp, lnum, startp, endp)
win_T *wp;
linenr_T lnum;
int *startp; /* first char of the change */
int *endp; /* last char of the change */
{
char_u *line_org;
char_u *line_new;
int i;
int si_org, si_new;
int ei_org, ei_new;
diff_T *dp;
int idx;
int off;
int added = TRUE;
/* Make a copy of the line, the next ml_get() will invalidate it. */
line_org = vim_strsave(ml_get_buf(wp->w_buffer, lnum, FALSE));
if (line_org == NULL)
return FALSE;
idx = diff_buf_idx(wp->w_buffer);
if (idx == DB_COUNT) /* cannot happen */
{
vim_free(line_org);
return FALSE;
}
/* 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 || diff_check_sanity(curtab, dp) == FAIL)
{
vim_free(line_org);
return FALSE;
}
off = lnum - dp->df_lnum[idx];
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)
&& vim_iswhite(line_org[si_org])
&& vim_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 (line_org[si_org] != line_new[si_new])
break;
++si_org;
++si_new;
}
}
#ifdef FEAT_MBYTE
if (has_mbyte)
{
/* Move back to first byte of character in both lines (may
* have "nn^" in line_org and "n^ in line_new). */
si_org -= (*mb_head_off)(line_org, line_org + si_org);
si_new -= (*mb_head_off)(line_new, line_new + si_new);
}
#endif
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)
&& vim_iswhite(line_org[ei_org])
&& vim_iswhite(line_new[ei_new]))
{
while (ei_org >= *startp
&& vim_iswhite(line_org[ei_org]))
--ei_org;
while (ei_new >= si_new
&& vim_iswhite(line_new[ei_new]))
--ei_new;
}
else
{
if (line_org[ei_org] != line_new[ei_new])
break;
--ei_org;
--ei_new;
}
}
if (*endp < ei_org)
*endp = ei_org;
}
}
vim_free(line_org);
return added;
}
#if defined(FEAT_FOLDING) || defined(PROTO)
/*
* Return TRUE if line "lnum" is not close to a diff block, this line should
* be in a fold.
* Return FALSE if there are no diff blocks at all in this window.
*/
int
diff_infold(wp, lnum)
win_T *wp;
linenr_T lnum;
{
int i;
int idx = -1;
int other = FALSE;
diff_T *dp;
/* Return if 'diff' isn't set. */
if (!wp->w_p_diff)
return FALSE;
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)
ex_diffupdate(NULL); /* update after a big change */
/* 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;
}
#endif
/*
* "dp" and "do" commands.
*/
void
nv_diffgetput(put)
int put;
{
exarg_T ea;
ea.arg = (char_u *)"";
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"
* ":diffput"
*/
void
ex_diffgetput(eap)
exarg_T *eap;
{
linenr_T lnum;
int count;
linenr_T off = 0;
diff_T *dp;
diff_T *dprev;
diff_T *dfree;
int idx_cur;
int idx_other;
int idx_from;
int idx_to;
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;
/* Find the current buffer in the list of diff buffers. */
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
|| curtab->tp_diffbuf[idx_other]->b_p_ma)
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 || curtab->tp_diffbuf[i]->b_p_ma))
{
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 && vim_iswhite(p[-1]))
--p;
for (i = 0; vim_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);
if (i < 0)
return; /* error message already given */
}
buf = buflist_findnr(i);
if (buf == NULL)
{
EMSG2(_("E102: Can't find buffer \"%s\""), eap->arg);
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"));
return;
}
}
dprev = NULL;
for (dp = curtab->tp_first_diff; dp != NULL; )
{
if (dp->df_lnum[idx_cur] > eap->line2 + off)
break; /* past the range that was specified */
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 = FALSE;
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;
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));
if (p != NULL)
{
ml_append(lnum + i - 1, p, 0, FALSE);
vim_free(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);
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);
if (dfree != NULL)
{
/* Diff is deleted, update folds in other windows. */
#ifdef FEAT_FOLDING
diff_fold_update(dfree, idx_to);
#endif
vim_free(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 (idx_other == idx_to)
{
/* 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);
}
diff_busy = FALSE;
/* Check that the cursor is on a valid character and update it's position.
* When there were filler lines the topline has become invalid. */
check_cursor();
changed_line_abv_curs();
/* Also need to redraw the other buffers. */
diff_redraw(FALSE);
}
#ifdef FEAT_FOLDING
/*
* Update folds for all diff buffers for entry "dp".
* Skip buffer with index "skip_idx".
* When there are no diffs, all folds are removed.
*/
static void
diff_fold_update(dp, skip_idx)
diff_T *dp;
int skip_idx;
{
int i;
win_T *wp;
for (wp = firstwin; wp != NULL; wp = wp->w_next)
for (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]);
}
#endif
/*
* Return TRUE if buffer "buf" is in diff-mode.
*/
int
diff_mode_buf(buf)
buf_T *buf;
{
tabpage_T *tp;
for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
if (diff_buf_idx_tp(buf, tp) != DB_COUNT)
return TRUE;
return FALSE;
}
/*
* Move "count" times in direction "dir" to the next diff block.
* Return FAIL if there isn't such a diff block.
*/
int
diff_move_to(dir, count)
int dir;
long count;
{
int idx;
linenr_T lnum = curwin->w_cursor.lnum;
diff_T *dp;
idx = diff_buf_idx(curbuf);
if (idx == DB_COUNT || curtab->tp_first_diff == NULL)
return FAIL;
if (curtab->tp_diff_invalid)
ex_diffupdate(NULL); /* update after a big change */
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;
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;
}
#if defined(FEAT_FOLDING) || defined(PROTO)
/*
* For line "lnum" in the current window find the equivalent lnum in window
* "wp", compensating for inserted/deleted lines.
*/
linenr_T
diff_lnum_win(lnum, wp)
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)
ex_diffupdate(NULL); /* update after a big change */
/* 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;
}
#endif
#endif /* FEAT_DIFF */