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4a11f206 PP |
1 | /* hist_erasedups -- remove all duplicate entries from history file */ |
2 | ||
3 | /* Copyright (C) 2011 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of the GNU Readline Library (Readline), a library for | |
6 | reading lines of text with interactive input and history editing. | |
7 | ||
8 | Readline is free software: you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation, either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | Readline is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with Readline. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | #ifndef READLINE_LIBRARY | |
22 | #define READLINE_LIBRARY 1 | |
23 | #endif | |
24 | ||
25 | #include <unistd.h> | |
26 | #include <stdlib.h> | |
27 | #include <stdio.h> | |
28 | ||
29 | #ifdef READLINE_LIBRARY | |
30 | # include "history.h" | |
31 | #else | |
32 | # include <readline/history.h> | |
33 | #endif | |
34 | ||
35 | #include <string.h> | |
36 | ||
37 | #define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0) | |
38 | #define STREQN(a, b, n) ((n == 0) ? (1) \ | |
39 | : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0)) | |
40 | ||
41 | extern int history_offset; | |
42 | ||
43 | static void | |
44 | usage() | |
45 | { | |
46 | fprintf (stderr, "hist_erasedups: usage: hist_erasedups [-t] [filename]\n"); | |
47 | exit (2); | |
48 | } | |
49 | ||
50 | int | |
51 | main (argc, argv) | |
52 | int argc; | |
53 | char **argv; | |
54 | { | |
55 | char *fn; | |
56 | int r; | |
57 | ||
58 | while ((r = getopt (argc, argv, "t")) != -1) | |
59 | { | |
60 | switch (r) | |
61 | { | |
62 | case 't': | |
63 | history_write_timestamps = 1; | |
64 | break; | |
65 | default: | |
66 | usage (); | |
67 | } | |
68 | } | |
69 | argv += optind; | |
70 | argc -= optind; | |
71 | ||
72 | fn = argc ? argv[0] : getenv ("HISTFILE"); | |
73 | if (fn == 0) | |
74 | { | |
75 | fprintf (stderr, "hist_erasedups: no history file\n"); | |
76 | usage (); | |
77 | } | |
78 | ||
79 | if ((r = read_history (fn)) != 0) | |
80 | { | |
81 | fprintf (stderr, "hist_erasedups: read_history: %s: %s\n", fn, strerror (r)); | |
82 | exit (1); | |
83 | } | |
84 | ||
85 | hist_erasedups (); | |
86 | ||
87 | if ((r = write_history (fn)) != 0) | |
88 | { | |
89 | fprintf (stderr, "hist_erasedups: write_history: %s: %s\n", fn, strerror (r)); | |
90 | exit (1); | |
91 | } | |
92 | ||
93 | exit (0); | |
94 | } | |
95 | ||
96 | int | |
97 | hist_erasedups () | |
98 | { | |
99 | int r, n; | |
100 | HIST_ENTRY *h, *temp; | |
101 | ||
102 | using_history (); | |
103 | while (h = previous_history ()) | |
104 | { | |
105 | r = where_history (); | |
106 | for (n = 0; n < r; n++) | |
107 | { | |
108 | temp = history_get (n+history_base); | |
109 | if (STREQ (h->line, temp->line)) | |
110 | { | |
111 | remove_history (n); | |
112 | r--; /* have to get one fewer now */ | |
113 | n--; /* compensate for above increment */ | |
114 | history_offset--; /* moving backwards in history list */ | |
115 | } | |
116 | } | |
117 | } | |
118 | using_history (); | |
119 | ||
120 | return r; | |
121 | } |