vim-patch:8.2.3433: :delcommand does not take a -buffer option

Problem:    :delcommand does not take a -buffer option.
Solution:   Add the -buffer option.
https://github.com/vim/vim/commit/bdcba24d8597abd5af509c2fb9206e64e713c711

3 files changed, 47 insertions, 6 deletions

diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 9244638788..2d2795b1ca 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1241,6 +1241,10 @@ See |:verbose-cmd| for more information.
 :delc[ommand] {cmd}				*:delc* *:delcommand* *E184*
 			Delete the user-defined command {cmd}.
 
+:delc[ommand] -buffer {cmd}					*E1237*
+			Delete the user-defined command {cmd} that was defined
+			for the current buffer.
+
 :comc[lear]						*:comc* *:comclear*
 			Delete all user-defined commands.
 
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index c30d58a8eb..1f416d9f57 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -78,6 +78,10 @@
 #include "nvim/vim.h"
 #include "nvim/window.h"
 
+static char *e_no_such_user_defined_command_str = N_("E184: No such user-defined command: %s");
+static char *e_no_such_user_defined_command_in_current_buffer_str
+    = N_("E1237: No such user-defined command in current buffer: %s");
+
 static int quitmore = 0;
 static bool ex_pressedreturn = false;
 
@@ -5737,26 +5741,36 @@ static void ex_delcommand(exarg_T *eap)
 {
   int i = 0;
   ucmd_T *cmd = NULL;
-  int cmp = -1;
+  int res = -1;
   garray_T *gap;
+  const char_u *arg = eap->arg;
+  bool buffer_only = false;
+
+  if (STRNCMP(arg, "-buffer", 7) == 0 && ascii_iswhite(arg[7])) {
+    buffer_only = true;
+    arg = skipwhite(arg + 7);
+  }
 
   gap = &curbuf->b_ucmds;
   for (;;) {
     for (i = 0; i < gap->ga_len; i++) {
       cmd = USER_CMD_GA(gap, i);
-      cmp = STRCMP(eap->arg, cmd->uc_name);
-      if (cmp <= 0) {
+      res = STRCMP(arg, cmd->uc_name);
+      if (res <= 0) {
         break;
       }
     }
-    if (gap == &ucmds || cmp == 0) {
+    if (gap == &ucmds || res == 0 || buffer_only) {
       break;
     }
     gap = &ucmds;
   }
 
-  if (cmp != 0) {
-    semsg(_("E184: No such user-defined command: %s"), eap->arg);
+  if (res != 0) {
+    semsg(_(buffer_only
+            ? e_no_such_user_defined_command_in_current_buffer_str
+            : e_no_such_user_defined_command_str),
+          arg);
     return;
   }
 
diff --git a/src/nvim/testdir/test_usercommands.vim b/src/nvim/testdir/test_usercommands.vim
index 481959d43d..2c4bf1bda5 100644
--- a/src/nvim/testdir/test_usercommands.vim
+++ b/src/nvim/testdir/test_usercommands.vim
@@ -551,3 +551,26 @@ func Test_command_list()
   call assert_equal("\nNo user-defined commands found", execute(':command Xxx'))
   call assert_equal("\nNo user-defined commands found", execute('command'))
 endfunc
+
+func Test_delcommand_buffer()
+  command Global echo 'global'
+  command -buffer OneBuffer echo 'one'
+  new
+  command -buffer TwoBuffer echo 'two'
+  call assert_equal(0, exists(':OneBuffer'))
+  call assert_equal(2, exists(':Global'))
+  call assert_equal(2, exists(':TwoBuffer'))
+  delcommand -buffer TwoBuffer
+  call assert_equal(0, exists(':TwoBuffer'))
+  call assert_fails('delcommand -buffer Global', 'E1237:')
+  call assert_fails('delcommand -buffer OneBuffer', 'E1237:')
+  bwipe!
+  call assert_equal(2, exists(':OneBuffer'))
+  delcommand -buffer OneBuffer
+  call assert_equal(0, exists(':OneBuffer'))
+  call assert_fails('delcommand -buffer Global', 'E1237:')
+  delcommand Global
+  call assert_equal(0, exists(':Global'))
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab