vim-patch:8.1.2225: the "last used" info of a buffer is under used

Problem:    The "last used" info of a buffer is under used.
Solution:   Add "lastused" to getbufinfo(). List buffers sorted by last-used
            field. (Andi Massimino, closes vim/vim#4722)
52410575be

runtime/doc/eval.txt

@@ -4164,6 +4164,9 @@ getbufinfo([{dict}])
 			changed		TRUE if the buffer is modified.
 			changedtick	number of changes made to the buffer.
 			hidden		TRUE if the buffer is hidden.
+			lastused	timestamp in seconds, like
+					|localtime()|, when the buffer was
+					last used.
 			listed		TRUE if the buffer is listed.
 			lnum		current line number in buffer.
 			linecount	number of lines in the buffer (only

runtime/doc/options.txt

@@ -6742,6 +6742,8 @@ A jump table for the options with a short description can be found at |Q_op|.
 			complete first match.
 	"list:longest"	When more than one match, list all matches and
 			complete till longest common string.
+	"list:lastused" When more than one buffer matches, sort buffers
+			by time last used (other than the current buffer).
 	When there is only a single match, it is fully completed in all cases.
 
 	Examples: >

runtime/doc/windows.txt

@@ -1023,6 +1023,7 @@ list of buffers. |unlisted-buffer|
 			#	alternate buffer
 			R	terminal buffers with a running job
 			F	terminal buffers with a finished job
+			t	show time last used and sort buffers
 		Combining flags means they are "and"ed together, e.g.:
 			h+	hidden buffers which are modified
 			a+	active buffers which are modified

src/nvim/buffer.c

@@ -2251,6 +2251,23 @@ int buflist_findpat(
   return match;
 }
 
+typedef struct {
+    buf_T   *buf;
+    char_u  *match;
+} bufmatch_T;
+
+/// Compare functions for qsort() below, that compares b_last_used.
+static int
+buf_time_compare(const void *s1, const void *s2)
+{
+  buf_T *buf1 = *(buf_T **)s1;
+  buf_T *buf2 = *(buf_T **)s2;
+
+  if (buf1->b_last_used == buf2->b_last_used) {
+    return 0;
+  }
+  return buf1->b_last_used > buf2->b_last_used ? -1 : 1;
+}
 
 /*
  * Find all buffer names that match.
@@ -2264,6 +2281,7 @@ int ExpandBufnames(char_u *pat, int *num_file, char_u ***file, int options)
   char_u      *p;
   int attempt;
   char_u      *patc;
+  bufmatch_T  *matches = NULL;
 
   *num_file = 0;                    // return values in case of FAIL
   *file = NULL;
@@ -2314,15 +2332,25 @@ int ExpandBufnames(char_u *pat, int *num_file, char_u ***file, int options)
             } else {
               p = vim_strsave(p);
             }
+            if (matches != NULL) {
+              matches[count].buf = buf;
+              matches[count].match = p;
+              count++;
+            } else {
               (*file)[count++] = p;
             }
           }
         }
+      }
       if (count == 0) {         // no match found, break here
         break;
       }
       if (round == 1) {
         *file = xmalloc((size_t)count * sizeof(**file));
+
+        if (options & WILD_BUFLASTUSED) {
+          matches = xmalloc((size_t)count * sizeof(*matches));
+        }
       }
     }
     vim_regfree(regmatch.regprog);
@@ -2335,6 +2363,25 @@ int ExpandBufnames(char_u *pat, int *num_file, char_u ***file, int options)
     xfree(patc);
   }
 
+  if (matches != NULL) {
+    if (count > 1) {
+      qsort(matches, (size_t)count, sizeof(bufmatch_T), buf_time_compare);
+    }
+
+    // if the current buffer is first in the list, place it at the end
+    if (matches[0].buf == curbuf) {
+      for (int i = 1; i < count; i++) {
+        (*file)[i-1] = matches[i].match;
+      }
+      (*file)[count-1] = matches[0].match;
+    } else {
+      for (int i = 0; i < count; i++) {
+        (*file)[i] = matches[i].match;
+      }
+    }
+    xfree(matches);
+  }
+
   *num_file = count;
   return count == 0 ? FAIL : OK;
 }
@@ -2595,11 +2642,32 @@ linenr_T buflist_findlnum(buf_T *buf)
 // List all known file names (for :files and :buffers command).
 void buflist_list(exarg_T *eap)
 {
-  buf_T       *buf;
+  buf_T       *buf = firstbuf;
   int len;
   int i;
 
-  for (buf = firstbuf; buf != NULL && !got_int; buf = buf->b_next) {
+  garray_T buflist;
+  buf_T **buflist_data = NULL, **p;
+
+  if (vim_strchr(eap->arg, 't')) {
+    ga_init(&buflist, sizeof(buf_T *), 50);
+    for (buf = firstbuf; buf != NULL; buf = buf->b_next) {
+      ga_grow(&buflist, 1);
+      ((buf_T **)buflist.ga_data)[buflist.ga_len++] = buf;
+    }
+
+    qsort(buflist.ga_data, (size_t)buflist.ga_len,
+          sizeof(buf_T *), buf_time_compare);
+
+    p = buflist_data = (buf_T **)buflist.ga_data;
+    buf = *p;
+  }
+
+  for (;
+       buf != NULL && !got_int;
+       buf = buflist_data
+       ? (++p < buflist_data + buflist.ga_len ? *p : NULL)
+       : buf->b_next) {
     const bool is_terminal = buf->terminal;
     const bool job_running = buf->terminal && terminal_running(buf->terminal);
 
@@ -2660,13 +2728,22 @@ void buflist_list(exarg_T *eap)
     do {
       IObuff[len++] = ' ';
     } while (--i > 0 && len < IOSIZE - 18);
+    if (vim_strchr(eap->arg, 't') && buf->b_last_used) {
+      add_time(IObuff + len, (size_t)(IOSIZE - len), buf->b_last_used);
+    } else {
       vim_snprintf((char *)IObuff + len, (size_t)(IOSIZE - len),
                    _("line %" PRId64),
                    buf == curbuf ? (int64_t)curwin->w_cursor.lnum
                    : (int64_t)buflist_findlnum(buf));
+    }
+
     msg_outtrans(IObuff);
     line_breakcheck();
   }
+
+  if (buflist_data) {
+    ga_clear(&buflist);
+  }
 }
 
 /*

src/nvim/eval.c

@@ -7241,6 +7241,8 @@ dict_T *get_buffer_info(buf_T *buf)
     tv_dict_add_list(dict, S_LEN("signs"), get_buffer_signs(buf));
   }
 
+  tv_dict_add_nr(dict, S_LEN("lastused"), buf->b_last_used);
+
   return dict;
 }
 

src/nvim/ex_getln.c

@@ -947,6 +947,10 @@ static int command_line_execute(VimState *state, int key)
   // - wildcard expansion is only done when the 'wildchar' key is really
   //   typed, not when it comes from a macro
   if ((s->c == p_wc && !s->gotesc && KeyTyped) || s->c == p_wcm) {
+    int options = WILD_NO_BEEP;
+    if (wim_flags[s->wim_index] & WIM_BUFLASTUSED) {
+      options |= WILD_BUFLASTUSED;
+    }
     if (s->xpc.xp_numfiles > 0) {       // typed p_wc at least twice
       // if 'wildmode' contains "list" may still need to list
       if (s->xpc.xp_numfiles > 1
@@ -960,10 +964,10 @@ static int command_line_execute(VimState *state, int key)
       }
 
       if (wim_flags[s->wim_index] & WIM_LONGEST) {
-        s->res = nextwild(&s->xpc, WILD_LONGEST, WILD_NO_BEEP,
+        s->res = nextwild(&s->xpc, WILD_LONGEST, options,
                           s->firstc != '@');
       } else if (wim_flags[s->wim_index] & WIM_FULL) {
-        s->res = nextwild(&s->xpc, WILD_NEXT, WILD_NO_BEEP,
+        s->res = nextwild(&s->xpc, WILD_NEXT, options,
                           s->firstc != '@');
       } else {
         s->res = OK;                 // don't insert 'wildchar' now
@@ -975,10 +979,10 @@ static int command_line_execute(VimState *state, int key)
       // if 'wildmode' first contains "longest", get longest
       // common part
       if (wim_flags[0] & WIM_LONGEST) {
-        s->res = nextwild(&s->xpc, WILD_LONGEST, WILD_NO_BEEP,
+        s->res = nextwild(&s->xpc, WILD_LONGEST, options,
                           s->firstc != '@');
       } else {
-        s->res = nextwild(&s->xpc, WILD_EXPAND_KEEP, WILD_NO_BEEP,
+        s->res = nextwild(&s->xpc, WILD_EXPAND_KEEP, options,
                           s->firstc != '@');
       }
 
@@ -1016,10 +1020,10 @@ static int command_line_execute(VimState *state, int key)
           s->did_wild_list = true;
 
           if (wim_flags[s->wim_index] & WIM_LONGEST) {
-            nextwild(&s->xpc, WILD_LONGEST, WILD_NO_BEEP,
+            nextwild(&s->xpc, WILD_LONGEST, options,
                      s->firstc != '@');
           } else if (wim_flags[s->wim_index] & WIM_FULL) {
-            nextwild(&s->xpc, WILD_NEXT, WILD_NO_BEEP,
+            nextwild(&s->xpc, WILD_NEXT, options,
                      s->firstc != '@');
           }
         } else {

src/nvim/ex_getln.h

@@ -31,6 +31,7 @@
 #define WILD_ALLLINKS           0x200
 #define WILD_IGNORE_COMPLETESLASH   0x400
 #define WILD_NOERROR            0x800  // sets EW_NOERROR
+#define WILD_BUFLASTUSED        0x1000
 
 /// Present history tables
 typedef enum {

src/nvim/misc1.c

@@ -1162,3 +1162,26 @@ int goto_im(void)
 {
   return p_im && stuff_empty() && typebuf_typed();
 }
+
+/// Put the timestamp of an undo header in "buf[buflen]" in a nice format.
+void add_time(char_u *buf, size_t buflen, time_t tt)
+{
+  struct tm curtime;
+
+  if (time(NULL) - tt >= 100) {
+    os_localtime_r(&tt, &curtime);
+    if (time(NULL) - tt < (60L * 60L * 12L)) {
+      // within 12 hours
+      (void)strftime((char *)buf, buflen, "%H:%M:%S", &curtime);
+    } else {
+      // longer ago
+      (void)strftime((char *)buf, buflen, "%Y/%m/%d %H:%M:%S", &curtime);
+    }
+  } else {
+    int64_t seconds = time(NULL) - tt;
+    vim_snprintf((char *)buf, buflen,
+                 NGETTEXT("%" PRId64 " second ago",
+                          "%" PRId64 " seconds ago", (uint32_t)seconds),
+                 seconds);
+  }
+}

src/nvim/option.c

@@ -7083,6 +7083,8 @@ static int check_opt_wim(void)
       new_wim_flags[idx] |= WIM_FULL;
     } else if (i == 4 && STRNCMP(p, "list", 4) == 0) {
       new_wim_flags[idx] |= WIM_LIST;
+    } else if (i == 8 && STRNCMP(p, "lastused", 8) == 0) {
+      new_wim_flags[idx] |= WIM_BUFLASTUSED;
     } else {
       return FAIL;
     }

src/nvim/option_defs.h

@@ -277,6 +277,7 @@ enum {
 #define WIM_FULL        1
 #define WIM_LONGEST     2
 #define WIM_LIST        4
+#define WIM_BUFLASTUSED 8
 
 // arguments for can_bs()
 #define BS_INDENT       'i'     // "Indent"

src/nvim/testdir/test_bufwintabinfo.vim

@@ -149,3 +149,10 @@ func Test_getbufinfo_lines()
   edit Xfoo
   bw!
 endfunc
+
+function Test_getbufinfo_lastused()
+  new Xfoo
+  let info = getbufinfo('Xfoo')[0]
+  call assert_equal(has_key(info, 'lastused'), 1)
+  call assert_equal(type(info.lastused), type(0))
+endfunc

src/nvim/testdir/test_cmdline.vim

@@ -755,3 +755,49 @@ func Test_cmdwin_feedkeys()
   " This should not generate E488
   call feedkeys("q:\<CR>", 'x')
 endfunc
+
+func Test_buffers_lastused()
+  " check that buffers are sorted by time when wildmode has lastused
+  edit bufc " oldest
+
+  sleep 1200m
+  enew
+  edit bufa " middle
+
+  sleep 1200m
+  enew
+  edit bufb " newest
+
+  enew
+
+  call assert_equal(['bufc', 'bufa', 'bufb'],
+	\ getcompletion('', 'buffer'))
+
+  let save_wildmode = &wildmode
+  set wildmode=full:lastused
+
+  let cap = "\<c-r>=execute('let X=getcmdline()')\<cr>"
+  call feedkeys(":b \<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufb', X)
+  call feedkeys(":b \<tab>\<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufa', X)
+  call feedkeys(":b \<tab>\<tab>\<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufc', X)
+  enew
+
+  sleep 1200m
+  edit other
+  call feedkeys(":b \<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufb', X)
+  call feedkeys(":b \<tab>\<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufa', X)
+  call feedkeys(":b \<tab>\<tab>\<tab>" .. cap .. "\<esc>", 'xt')
+  call assert_equal('b bufc', X)
+  enew
+
+  let &wildmode = save_wildmode
+
+  bwipeout bufa
+  bwipeout bufb
+  bwipeout bufc
+endfunc

src/nvim/testdir/test_excmd.vim

@@ -8,3 +8,35 @@ func Test_ex_delete()
   .dl
   call assert_equal(['a', 'c'], getline(1, 2))
 endfunc
+
+func Test_buffers_lastused()
+  edit bufc " oldest
+
+  sleep 1200m
+  edit bufa " middle
+
+  sleep 1200m
+  edit bufb " newest
+
+  enew
+
+  let ls = split(execute('buffers t', 'silent!'), '\n')
+  let bufs = []
+  for line in ls
+    let bufs += [split(line, '"\s*')[1:2]]
+  endfor
+
+  let names = []
+  for buf in bufs
+    if buf[0] !=# '[No Name]'
+      let names += [buf[0]]
+    endif
+  endfor
+
+  call assert_equal(['bufb', 'bufa', 'bufc'], names)
+  call assert_match('[0-2] seconds ago', bufs[1][1])
+
+  bwipeout bufa
+  bwipeout bufb
+  bwipeout bufc
+endfunc

src/nvim/undo.c

@@ -2441,10 +2441,11 @@ static void u_undo_end(
     uhp = curbuf->b_u_newhead;
   }
 
-  if (uhp == NULL)
+  if (uhp == NULL) {
     *msgbuf = NUL;
-  else
+  } else {
-    u_add_time(msgbuf, sizeof(msgbuf), uhp->uh_time);
+    add_time(msgbuf, sizeof(msgbuf), uhp->uh_time);
+  }
 
   {
     FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
@@ -2509,7 +2510,7 @@ void ex_undolist(exarg_T *eap)
         && uhp->uh_walk != mark) {
       vim_snprintf((char *)IObuff, IOSIZE, "%6ld %7d  ",
                    uhp->uh_seq, changes);
-      u_add_time(IObuff + STRLEN(IObuff), IOSIZE - STRLEN(IObuff),
+      add_time(IObuff + STRLEN(IObuff), IOSIZE - STRLEN(IObuff),
                uhp->uh_time);
       if (uhp->uh_save_nr > 0) {
         while (STRLEN(IObuff) < 33)
@@ -2574,30 +2575,6 @@ void ex_undolist(exarg_T *eap)
   }
 }
 
-/*
- * Put the timestamp of an undo header in "buf[buflen]" in a nice format.
- */
-static void u_add_time(char_u *buf, size_t buflen, time_t tt)
-{
-  struct tm curtime;
-
-  if (time(NULL) - tt >= 100) {
-    os_localtime_r(&tt, &curtime);
-    if (time(NULL) - tt < (60L * 60L * 12L))
-      /* within 12 hours */
-      (void)strftime((char *)buf, buflen, "%H:%M:%S", &curtime);
-    else
-      /* longer ago */
-      (void)strftime((char *)buf, buflen, "%Y/%m/%d %H:%M:%S", &curtime);
-  } else {
-    int64_t seconds = time(NULL) - tt;
-    vim_snprintf((char *)buf, buflen,
-                 NGETTEXT("%" PRId64 " second ago",
-                          "%" PRId64 " seconds ago", (uint32_t)seconds),
-                 seconds);
-  }
-}
-
 /*
  * ":undojoin": continue adding to the last entry list
  */