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Re: Feature: Easily remove current command from history


From: Piotr Grzybowski
Subject: Re: Feature: Easily remove current command from history
Date: Fri, 8 Jan 2016 22:01:47 +0100

On Thu, Jan 7, 2016 at 9:32 PM, Chet Ramey <address@hidden> wrote:
> On 1/5/16 8:08 AM, Greg Wooledge wrote:
>
>> imadev:~$ zap me
>> bash: zap: command not found
>> imadev:~$ history -d -1
>> bash: history: -1: history position out of range
>> imadev:~$ history -d end
>> bash: history: end: history position out of range
>> [..]
>
> Yes, this is a reasonable feature to consider for a future version.

 I cant believe we do not have it already.
 Maybe I am missing something, please review the following (works for
me; devel at 6f82653c5ef09aeeeba4376a1c65ce86c3605c00, also in
attachment in case of formatting problems):

diff --git a/builtins/history.def b/builtins/history.def
index dfa4fb7..4c938af 100644
--- a/builtins/history.def
+++ b/builtins/history.def
@@ -107,6 +107,8 @@ history_builtin (list)
   int flags, opt, result, old_history_lines, obase;
   char *filename, *delete_arg;
   intmax_t delete_offset;
+  int is_legal_number = 0;
+  int index = 0;

   flags = 0;
   reset_internal_getopt ();
@@ -180,14 +182,34 @@ history_builtin (list)
 #endif
   else if (flags & DFLAG)
     {
-      if ((legal_number (delete_arg, &delete_offset) == 0)
-         || (delete_offset < history_base)
+     is_legal_number = legal_number (delete_arg, &delete_offset);
+     if (is_legal_number == 0)
+       {
+         sh_erange (delete_arg, _("history position"));
+         return (EXECUTION_FAILURE);
+       }
+     if ((delete_arg[0] == '-') && (delete_offset < 0))
+       {
+         if ((index = history_length + delete_offset) >= 0)
+           {
+             opt = index + 1;
+           }
+         else
+           {
+             sh_erange (delete_arg, _("history position"));
+             return (EXECUTION_FAILURE);
+           }
+       }
+     else
+       {
+      if ((delete_offset < history_base)
          || (delete_offset > (history_base + history_length)))
        {
          sh_erange (delete_arg, _("history position"));
          return (EXECUTION_FAILURE);
        }
       opt = delete_offset;
+       }
       result = bash_delete_histent (opt - history_base);
       /* Since remove_history changes history_length, this can happen if
         we delete the last history entry. */

sincerely,
pg

Attachment: Greg_suggests_history_d_negative_offsets_patch.diff
Description: Text document


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