1 This file is history.def, from which is created history.c.
2 It implements the builtin "history" in Bash.
4 Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
25 $FUNCTION history_builtin
27 $SHORT_DOC history [-c] [-d offset] [n] or history -awrn [filename] or history -ps arg [arg...]
28 Display the history list with line numbers. Lines listed with
29 with a `*' have been modified. Argument of N says to list only
30 the last N lines. The `-c' option causes the history list to be
31 cleared by deleting all of the entries. The `-d' option deletes
32 the history entry at offset OFFSET. The `-w' option writes out the
33 current history to the history file; `-r' means to read the file and
34 append the contents to the history list instead. `-a' means
35 to append history lines from this session to the history file.
36 Argument `-n' means to read all history lines not already read
37 from the history file and append them to the history list. If
38 FILENAME is given, then that is used as the history file else
39 if $HISTFILE has a value, that is used, else ~/.bash_history.
40 If the -s option is supplied, the non-option ARGs are appended to
41 the history list as a single entry. The -p option means to perform
42 history expansion on each ARG and display the result, without storing
43 anything in the history list.
49 #include "../bashtypes.h"
51 # include <sys/file.h>
53 #include "posixstat.h"
57 #if defined (HAVE_UNISTD_H)
61 #include "../bashansi.h"
64 #include "../bashhist.h"
65 #include <readline/history.h>
66 #include "bashgetopt.h"
73 static void display_history __P((WORD_LIST *));
74 static int delete_histent __P((int));
75 static int delete_last_history __P((void));
76 static void push_history __P((WORD_LIST *));
77 static int expand_and_print_history __P((WORD_LIST *));
89 history_builtin (list)
92 int flags, opt, result;
93 char *filename, *delete_arg;
97 reset_internal_getopt ();
98 while ((opt = internal_getopt (list, "acd:npsrw")) != -1)
122 delete_arg = list_optarg;
125 #if defined (BANG_HISTORY)
136 opt = flags & (AFLAG|RFLAG|WFLAG|NFLAG);
137 if (opt && opt != AFLAG && opt != RFLAG && opt != WFLAG && opt != NFLAG)
139 builtin_error ("cannot use more than one of -anrw");
140 return (EXECUTION_FAILURE);
143 /* clear the history, but allow other arguments to add to it again. */
148 return (EXECUTION_SUCCESS);
155 return (EXECUTION_SUCCESS);
157 #if defined (BANG_HISTORY)
158 else if (flags & PFLAG)
161 return (expand_and_print_history (list));
162 return (EXECUTION_SUCCESS);
165 else if (flags & DFLAG)
167 if ((legal_number (delete_arg, &delete_offset) == 0)
168 || (delete_offset < history_base)
169 || (delete_offset > (history_base + history_length)))
171 builtin_error ("%s: not a valid history position", delete_arg);
172 return (EXECUTION_FAILURE);
175 result = delete_histent (opt - history_base);
176 /* Since remove_history changes history_length, this can happen if
177 we delete the last history entry. */
178 if (where_history () > history_length)
179 history_set_pos (history_length);
180 return (result ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
182 else if ((flags & (AFLAG|RFLAG|NFLAG|WFLAG|CFLAG)) == 0)
184 display_history (list);
185 return (EXECUTION_SUCCESS);
188 filename = list ? list->word->word : get_string_value ("HISTFILE");
189 result = EXECUTION_SUCCESS;
191 if (flags & AFLAG) /* Append session's history to file. */
192 result = maybe_append_history (filename);
193 else if (flags & WFLAG) /* Write entire history. */
194 result = write_history (filename);
195 else if (flags & RFLAG) /* Read entire file. */
196 result = read_history (filename);
197 else if (flags & NFLAG) /* Read `new' history from file. */
199 /* Read all of the lines in the file that we haven't already read. */
201 result = read_history_range (filename, history_lines_in_file, -1);
203 history_lines_in_file = where_history ();
206 return (result ? EXECUTION_FAILURE : EXECUTION_SUCCESS);
209 /* Accessors for HIST_ENTRY lists that are called HLIST. */
210 #define histline(i) (hlist[(i)]->line)
211 #define histdata(i) (hlist[(i)]->data)
214 display_history (list)
223 limit = get_numeric_arg (list, 0);
230 hlist = history_list ();
234 for (i = 0; hlist[i]; i++)
237 if (0 <= limit && limit < i)
245 printf ("%5d%c %s\n", i + history_base,
246 histdata(i) ? '*' : ' ',
253 /* Delete and free the history list entry at offset I. */
260 discard = remove_history (i);
264 free (discard->line);
265 free ((char *) discard);
271 delete_last_history ()
274 HIST_ENTRY **hlist, *histent;
276 hlist = history_list ();
280 for (i = 0; hlist[i]; i++)
284 /* History_get () takes a parameter that must be offset by history_base. */
285 histent = history_get (history_base + i); /* Don't free this */
289 return (delete_histent (i));
292 /* Remove the last entry in the history list and add each argument in
293 LIST to the history. */
300 if (hist_last_line_added && delete_last_history () == 0)
302 s = string_list (list);
303 maybe_add_history (s); /* Obeys HISTCONTROL setting. */
307 #if defined (BANG_HISTORY)
309 expand_and_print_history (list)
315 if (hist_last_line_added && delete_last_history () == 0)
316 return EXECUTION_FAILURE;
317 result = EXECUTION_SUCCESS;
320 r = history_expand (list->word->word, &s);
323 builtin_error ("%s: history expansion failed", list->word->word);
324 result = EXECUTION_FAILURE;
337 #endif /* BANG_HISTORY */