Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

1 files changed, 0 insertions, 2611 deletions

diff --git a/src/diff.c b/src/diff.c
deleted file mode 100644
index e360edc665..0000000000
--- a/src/diff.c
+++ /dev/null
@@ -1,2611 +0,0 @@
-/// @file diff.c
-///
-/// Code for diff'ing two, three or four buffers.
-
-#include "vim.h"
-#include "diff.h"
-#include "buffer.h"
-#include "charset.h"
-#include "eval.h"
-#include "ex_cmds.h"
-#include "ex_docmd.h"
-#include "fileio.h"
-#include "fold.h"
-#include "mark.h"
-#include "mbyte.h"
-#include "memline.h"
-#include "message.h"
-#include "misc1.h"
-#include "misc2.h"
-#include "memory.h"
-#include "move.h"
-#include "normal.h"
-#include "option.h"
-#include "path.h"
-#include "screen.h"
-#include "undo.h"
-#include "window.h"
-#include "os/os.h"
-#include "os/shell.h"
-
-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
-
-// TRUE when "diff -a" works, FALSE when it doesn't work, MAYBE when not
-// checked yet
-static int diff_a_works = MAYBE;
-
-static int diff_buf_idx(buf_T *buf);
-static int diff_buf_idx_tp(buf_T *buf, tabpage_T *tp);
-static void diff_mark_adjust_tp(tabpage_T *tp, int idx, linenr_T line1,
-                                linenr_T line2, long amount,
-                                long amount_after);
-static void diff_check_unchanged(tabpage_T *tp, diff_T *dp);
-static int diff_check_sanity(tabpage_T *tp, diff_T *dp);
-static void diff_redraw(int dofold);
-static int diff_write(buf_T *buf, char_u *fname);
-static void diff_file(char_u *tmp_orig, char_u *tmp_new, char_u *tmp_diff);
-static int diff_equal_entry(diff_T *dp, int idx1, int idx2);
-static int diff_cmp(char_u *s1, char_u *s2);
-static void diff_fold_update(diff_T *dp, int skip_idx);
-static void diff_read(int idx_orig, int idx_new, char_u *fname);
-static void diff_copy_entry(diff_T *dprev, diff_T *dp, int idx_orig,
-                            int idx_new);
-static diff_T* diff_alloc_new(tabpage_T *tp, diff_T *dprev, diff_T *dp);
-
-#ifndef USE_CR
-# define tag_fgets vim_fgets
-#endif  // ifndef USE_CR
-
-/// Called when deleting or unloading a buffer: No longer make a diff with it.
-///
-/// @param buf
-void diff_buf_delete(buf_T *buf)
-{
-  tabpage_T *tp;
-  for (tp = first_tabpage; tp != NULL; tp = tp->tp_next) {
-    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.
-    win_T *wp;
-    for (wp = firstwin; wp != NULL; wp = wp->w_next) {
-      if ((wp->w_buffer == win->w_buffer) && wp->w_p_diff) {
-        break;
-      }
-    }
-
-    if (wp == NULL) {
-      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: Can not diff more than %" PRId64 " buffers"), DB_COUNT);
-}
-
-/// 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)
-{
-  tabpage_T *tp;
-  for (tp = first_tabpage; tp != NULL; tp = tp->tp_next) {
-    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.
-  tabpage_T *tp;
-  for (tp = first_tabpage; tp != NULL; tp = tp->tp_next) {
-    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)
-{
-  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;
-      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.
-    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;
-      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".
-///
-/// @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));
-
-      if (line_org == NULL) {
-        return;
-      }
-
-      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;
-        }
-      }
-      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.
-///
-/// @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
-static void diff_redraw(int dofold)
-{
-  win_T *wp;
-  for (wp = firstwin; wp != NULL; wp = wp->w_next) {
-    if (wp->w_p_diff) {
-      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;
-        }
-      }
-    }
-  }
-}
-
-/// Write buffer "buf" to file "name".
-///
-/// Always use 'fileformat' set to "unix".
-///
-/// @param buf
-/// @param fname
-///
-/// @return FAIL for failure
-static int diff_write(buf_T *buf, char_u *fname)
-{
-  char_u *save_ff = buf->b_p_ff;
-  buf->b_p_ff = vim_strsave((char_u *)FF_UNIX);
-  int 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).
-///
-/// @param eap can be NULL
-void ex_diffupdate(exarg_T *eap)
-{
-  // 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) {
-    return;
-  }
-
-  // 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) {
-    return;
-  }
-
-  // We need three temp file names.
-  char_u *tmp_orig = vim_tempname('o');
-  char_u *tmp_new = vim_tempname('n');
-  char_u *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.
-  int io_error = FALSE;
-  int ok = FALSE;
-  for (;;) {
-    ok = FALSE;
-    FILE *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);
-        }
-        os_remove((char *)tmp_diff);
-        os_remove((char *)tmp_new);
-      }
-      os_remove((char *)tmp_orig);
-    }
-
-    // When using 'diffexpr' break here.
-    if (*p_dex != NUL) {
-      break;
-    }
-
-    // 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;
-    goto theend;
-  }
-
-  // :diffupdate!
-  if ((eap != NULL) && eap->forceit) {
-    for (idx_new = idx_orig; idx_new < DB_COUNT; ++idx_new) {
-      buf_T *buf = curtab->tp_diffbuf[idx_new];
-      if (buf_valid(buf)) {
-        buf_check_timestamp(buf, FALSE);
-      }
-    }
-  }
-
-  // Write the first buffer to a tempfile.
-  buf_T *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_T *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);
-    os_remove((char *)tmp_diff);
-    os_remove((char *)tmp_new);
-  }
-  os_remove((char *)tmp_orig);
-
-  // force updating cursor position on screen
-  curwin->w_valid_cursor.lnum = 0;
-
-  diff_redraw(TRUE);
-
-theend:
-  free(tmp_orig);
-  free(tmp_new);
-  free(tmp_diff);
-}
-
-/// Make a diff between files "tmp_orig" and "tmp_new", results in "tmp_diff".
-///
-/// @param tmp_orig
-/// @param tmp_new
-/// @param tmp_diff
-static void diff_file(char_u *tmp_orig, char_u *tmp_new, char_u *tmp_diff)
-{
-  if (*p_dex != NUL) {
-    // Use 'diffexpr' to generate the diff file.
-    eval_diff(tmp_orig, tmp_new, tmp_diff);
-  } else {
-    size_t len = STRLEN(tmp_orig) + STRLEN(tmp_new) + STRLEN(tmp_diff)
-        + STRLEN(p_srr) + 27;
-    char_u *cmd = xmalloc(len);
-
-    /* We don't want $DIFF_OPTIONS to get in the way. */
-    if (os_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. */
-    vim_snprintf((char *)cmd, len, "diff %s%s%s%s%s %s",
-                 diff_a_works == FALSE ? "" : "-a ",
-                 "",
-                 (diff_flags & DIFF_IWHITE) ? "-b " : "",
-                 (diff_flags & DIFF_ICASE) ? "-i " : "",
-                 tmp_orig, tmp_new);
-    append_redir(cmd, (int)len, p_srr, tmp_diff);
-    block_autocmds(); /* Avoid ShellCmdPost stuff */
-    (void)call_shell(
-        cmd,
-        kShellOptFilter | kShellOptSilent | kShellOptDoOut,
-        NULL
-        );
-    unblock_autocmds();
-    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).
-///
-/// @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
-
-#ifdef UNIX
-  char_u dirbuf[MAXPATHL];
-  char_u *fullname = NULL;
-#endif  // ifdef UNIX
-  // We need two temp file names.
-  // Name of original temp file.
-  char_u *tmp_orig = vim_tempname('o');
-  // Name of patched temp file.
-  char_u *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  // ifdef UNIX
-
-#ifdef UNIX
-  size_t buflen = STRLEN(tmp_orig)
-      + (fullname != NULL ? STRLEN(fullname) : STRLEN(eap->arg))
-      + STRLEN(tmp_new) + 16;
-#else
-  size_t buflen = STRLEN(tmp_orig) + (STRLEN(eap->arg)) + STRLEN(tmp_new) + 16;
-#endif  // ifdef UNIX
-
-  buf = xmalloc(buflen);
-
-#ifdef UNIX
-
-  // 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 {
-# ifdef TEMPDIRNAMES
-    if (vim_tempdir != NULL) {
-      ignored = os_chdir((char *)vim_tempdir);
-    } else {
-      ignored = os_chdir("/tmp");
-    }
-# else
-    ignored = os_chdir("/tmp");
-# endif  // ifdef TEMPDIRNAMES
-    shorten_fnames(TRUE);
-  }
-#endif  // ifdef UNIX
-
-  if (*p_pex != NUL) {
-    // Use 'patchexpr' to generate the new file.
-#ifdef UNIX
-    eval_patch(tmp_orig, fullname != NULL ? fullname : eap->arg, tmp_new);
-#else
-    eval_patch(tmp_orig, eap->arg, tmp_new);
-#endif  // ifdef UNIX
-  } else {
-    // Build the patch command and execute it. Ignore errors. Switch to
-    // cooked mode to allow the user to respond to prompts.
-#ifdef UNIX
-    vim_snprintf((char *)buf, buflen, "patch -o %s %s < \"%s\"",
-                 tmp_new, tmp_orig, fullname != NULL ? fullname : eap->arg);
-#else
-    vim_snprintf((char *)buf, buflen, "patch -o %s %s < \"%s\"",
-                 tmp_new, tmp_orig, eap->arg);
-#endif  // ifdef UNIX
-    // Avoid ShellCmdPost stuff
-    block_autocmds();
-    (void)call_shell(buf, kShellOptFilter | kShellOptCooked, NULL);
-    unblock_autocmds();
-  }
-
-#ifdef UNIX
-  if (dirbuf[0] != NUL) {
-    if (os_chdir((char *)dirbuf) != 0) {
-      EMSG(_(e_prev_dir));
-    }
-    shorten_fnames(TRUE);
-  }
-#endif  // ifdef UNIX
-
-  // patch probably has written over the screen
-  redraw_later(CLEAR);
-
-  // 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.
-  off_t file_size;
-  bool file_size_success = os_get_file_size((char *)tmp_new, &file_size);
-  if (!file_size_success || file_size == 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));
-
-      if (newname != NULL) {
-        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((char_u *)":doau filetypedetect BufRead");
-          }
-        }
-      }
-    }
-  }
-
-theend:
-  if (tmp_orig != NULL) {
-    os_remove((char *)tmp_orig);
-  }
-  free(tmp_orig);
-
-  if (tmp_new != NULL) {
-    os_remove((char *)tmp_new);
-  }
-  free(tmp_new);
-  free(newname);
-  free(buf);
-#ifdef UNIX
-  free(fullname);
-#endif  // ifdef UNIX
-}
-
-/// 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;
-
-  // 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);
-      diff_win_options(old_curwin, TRUE);
-    }
-  }
-}
-
-// 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);
-}
-
-/// 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;
-
-  wp->w_p_diff = TRUE;
-
-  // Use 'scrollbind' and 'cursorbind' when available
-  if (!wp->w_p_diff_saved) {
-    wp->w_p_scb_save = wp->w_p_scb;
-  }
-  wp->w_p_scb = TRUE;
-
-  if (!wp->w_p_diff_saved) {
-    wp->w_p_crb_save = wp->w_p_crb;
-  }
-  wp->w_p_crb = TRUE;
-
-  if (!wp->w_p_diff_saved) {
-    wp->w_p_wrap_save = wp->w_p_wrap;
-  }
-  wp->w_p_wrap = FALSE;
-  curwin = wp;
-  curbuf = curwin->w_buffer;
-
-  if (!wp->w_p_diff_saved) {
-    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_saved) {
-    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 a fold
-  changed_window_setting_win(wp);
-  if (vim_strchr(p_sbo, 'h') == NULL) {
-    do_cmdline_cmd((char_u *)"set sbo+=hor");
-  }
-
-  // Saved the current values, to be restored in ex_diffoff().
-  wp->w_p_diff_saved = 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)
-{
-  win_T *old_curwin = curwin;