2 * selector is a simple shell command for selection of strings with a
3 * dynamic pattern-matching.
5 * Copyright (c) 2009 Francois Fleuret
6 * Written by Francois Fleuret <francois.fleuret@idiap.ch>
8 * This file is part of selector.
10 * selector is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 3 as
12 * published by the Free Software Foundation.
14 * selector is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with selector. If not, see <http://www.gnu.org/licenses/>.
26 Here is the magical shell script for a smart bash-history. Note that
27 the line remains in /tmp/selector.out, which may be a security
30 ./selector -f ~/.bash_history
31 OLD_SETTINGS=`stty -g`
33 writevt `tty` "`cat /tmp/selector.out`"
44 #include <sys/types.h>
50 int buffer_size = 1024;
51 int nb_lines_max = 1000;
52 char pattern_separator = ';';
53 int output_to_vt_buffer = 0;
55 int match(char *string, int nb_patterns, char **patterns) {
56 for(int n = 0; n < nb_patterns; n++) {
57 if(strstr(string, patterns[n]) == 0) return 0;
62 void check_opt(int argc, char **argv, int n_opt, int n, const char *help) {
63 if(n_opt + n >= argc) {
64 cerr << "Missing argument for " << argv[n_opt] << "."
66 << "Expecting " << help << "."
72 int previous_visible(int current_line, int nb_lines, char **lines, int nb_patterns, char **patterns) {
73 int line = current_line - 1;
74 while(line >= 0 && !match(lines[line], nb_patterns, patterns)) line--;
78 int next_visible(int current_line, int nb_lines, char **lines, int nb_patterns, char **patterns) {
79 int line = current_line + 1;
80 while(line < nb_lines && !match(lines[line], nb_patterns, patterns)) line++;
88 void update_screen(int *current_line, int *temporary_line, int motion,
89 int nb_lines, char **lines,
93 char buffer[buffer_size];
95 // We split the pattern list into individual patterns
99 for(char *s = pattern_list; *s; s++) {
100 if(*s == pattern_separator) {
105 char splitted_patterns[strlen(pattern_list) + 1];
106 char *patterns[nb_patterns];
108 strcpy(splitted_patterns, pattern_list);
111 char *last_pattern_start = splitted_patterns;
112 for(char *s = splitted_patterns; n < nb_patterns; s++) {
113 if(*s == pattern_separator || *s == '\0') {
115 patterns[n++] = last_pattern_start;
116 last_pattern_start = s + 1;
120 // We now take care of printing the lines per se
122 int console_width = getmaxx(stdscr);
123 int console_height = getmaxy(stdscr);
125 int nb_printed_lines = 1;
127 // First, we find a visible line. In priority: The current, or the
128 // first visible after it, or the first visible before it.
131 if(match(lines[*current_line], nb_patterns, patterns)) {
132 new_line = *current_line;
134 new_line = next_visible(*current_line, nb_lines, lines, nb_patterns, patterns);
136 new_line = previous_visible(*current_line, nb_lines, lines, nb_patterns, patterns);
140 // If we found a visible line and we should move, let's move
142 if(new_line >= 0 && motion != 0) {
145 // We want to go down, let's find the first visible line below
146 for(int m = 0; l >= 0 && m < motion; m++) {
147 l = next_visible(l, nb_lines, lines, nb_patterns, patterns);
153 // We want to go up, let's find the first visible line above
154 for(int m = 0; l >= 0 && m < -motion; m++) {
155 l = previous_visible(l, nb_lines, lines, nb_patterns, patterns);
167 use_default_colors();
171 // Here new_line is either a line number matching the patterns, or -1
175 int first_line = new_line, last_line = new_line, nb_match = 1;
177 // We find the first and last line to show, so that the total of
178 // visible lines between them (them include) is console_height - 1
180 while(nb_match < console_height-1 && (first_line > 0 || last_line < nb_lines - 1)) {
184 while(first_line > 0 && !match(lines[first_line], nb_patterns, patterns)) {
187 if(match(lines[first_line], nb_patterns, patterns)) {
192 if(last_line < nb_lines - 1) {
194 while(last_line < nb_lines - 1 && !match(lines[last_line], nb_patterns, patterns)) {
198 if(match(lines[last_line], nb_patterns, patterns)) {
204 // Now we display them
206 for(int l = first_line; l <= last_line; l++) {
207 if(match(lines[l], nb_patterns, patterns)) {
210 while(lines[l][k] && k < buffer_size - 2 && k < console_width - 2) {
211 buffer[k] = lines[l][k];
215 if(no_blink || l == new_line) {
216 while(k < console_width) {
225 attron(COLOR_PAIR(2));
226 addnstr(buffer, console_width);
227 attroff(COLOR_PAIR(2));
229 addnstr(buffer, console_width);
236 *temporary_line = new_line;
238 *current_line = new_line;
242 // if(nb_printed_lines == 1) {
243 // addnstr("[no selection]\n", console_width);
244 // nb_printed_lines++;
247 if(no_blink) { // Erase the rest of the window. That's slightly ugly.
249 while(k < console_width) {
254 for(int l = nb_printed_lines; l < console_height; l++) {
255 addnstr(buffer, console_width);
261 sprintf(buffer, "%d/%d pattern: %s",
262 nb_printed_lines - 1,
266 for(int k = strlen(buffer); k < console_width; k++) buffer[k] = ' ';
267 buffer[console_width] = '\0';
270 attron(COLOR_PAIR(1));
271 addnstr(buffer, console_width);
272 attroff(COLOR_PAIR(1));
274 refresh(); // After doing something on the display, we refresh it
277 //////////////////////////////////////////////////////////////////////
279 int main(int argc, char **argv) {
280 char buffer[buffer_size];
281 char *lines[nb_lines_max];
284 char input_filename[buffer_size], output_filename[buffer_size];
285 strcpy(input_filename, "/dev/stdin");
286 strcpy(output_filename, "/tmp/selector.out");
290 if(strcmp(argv[i], "-o") == 0) {
291 check_opt(argc, argv, i, 1, "<output filename>");
292 strncpy(output_filename, argv[i+1], buffer_size);
296 else if(strcmp(argv[i], "-s") == 0) {
297 check_opt(argc, argv, i, 1, "<pattern separator>");
298 pattern_separator = argv[i+1][0];
302 else if(strcmp(argv[i], "-v") == 0) {
303 output_to_vt_buffer = 1;
307 else if(strcmp(argv[i], "-f") == 0) {
308 check_opt(argc, argv, i, 1, "<input filename>");
309 strncpy(input_filename, argv[i+1], buffer_size);
313 else if(strcmp(argv[i], "-b") == 0) {
318 else if(strcmp(argv[i], "-l") == 0) {
319 check_opt(argc, argv, i, 1, "<maximum number of lines>");
320 nb_lines_max = atoi(argv[i+1]);
325 cerr << argv[0] << " [-h] [-o <output filename>] [-b] [-l <max number of lines>] [-s <pattern separator>] [-v]" << endl;
326 if(strcmp(argv[i], "-h") == 0) {
334 ifstream file(input_filename);
337 cerr << "Can not open \"" << input_filename << "\"" << endl;
342 while(nb_lines < nb_lines_max && !file.eof()) {
343 file.getline(buffer, buffer_size);
344 lines[nb_lines] = new char[strlen(buffer) + 1];
345 strcpy(lines[nb_lines], buffer);
349 char patterns[buffer_size];
357 cerr << "No colors." << endl;
363 keypad(stdscr, TRUE);
366 // init_pair(1, COLOR_WHITE, COLOR_BLACK);
367 init_pair(1, COLOR_WHITE, COLOR_GREEN);
368 init_pair(2, COLOR_BLACK, COLOR_YELLOW);
372 int current_line = 0, temporary_line = 0;
374 update_screen(¤t_line, &temporary_line, 0, nb_lines, lines, patterns, no_blink);
382 if(key >= ' ' && key <= 'z') {
383 patterns[patterns_point++] = key;
384 patterns[patterns_point] = '\0';
387 else if(key == KEY_BACKSPACE || key == KEY_DC || key == '
\b') {
388 if(patterns_point > 0) {
390 patterns[patterns_point] = '\0';
394 else if(key == KEY_HOME) {
398 else if(key == KEY_END) {
399 current_line = nb_lines - 1;
402 else if(key == KEY_NPAGE) {
406 else if(key == KEY_PPAGE) {
410 else if(key == KEY_UP || key == '
\10') {
414 else if(key == KEY_DOWN || key == '
\ e') {
418 update_screen(¤t_line, &temporary_line, motion,
419 nb_lines, lines, patterns, no_blink);
420 } while(key != '\n' && key != KEY_ENTER && key != '
\a');
426 if(output_to_vt_buffer) {
427 if((key == KEY_ENTER || key == '\n') && temporary_line >= 0 && temporary_line < nb_lines) {
428 char *tty = ttyname (STDIN_FILENO);
429 int fd = open(tty, O_WRONLY);
430 write(fd, lines[temporary_line], strlen(lines[temporary_line]));
435 ofstream out(output_filename);
437 cerr << "Can not open " << output_filename << " for writing." << endl;
440 if((key == KEY_ENTER || key == '\n') && temporary_line >= 0 && temporary_line < nb_lines) {
441 out << lines[temporary_line] << endl;
449 for(int l = 0; l < nb_lines; l++) {