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/>.
24 // Here is how to use it as a super-history-search in bash
26 // ./selector -v -f ${HISTFILE}
36 #include <sys/ioctl.h>
41 // Yeah, global variables!
43 int buffer_size = 1024;
44 int nb_lines_max = 1000;
45 char pattern_separator = ';';
46 int output_to_vt_buffer = 0;
48 //////////////////////////////////////////////////////////////////////
50 int match(char *string, int nb_patterns, char **patterns) {
51 for(int n = 0; n < nb_patterns; n++) {
52 if(strstr(string, patterns[n]) == 0) return 0;
57 //////////////////////////////////////////////////////////////////////
59 void check_opt(int argc, char **argv, int n_opt, int n, const char *help) {
60 if(n_opt + n >= argc) {
61 cerr << "Missing argument for " << argv[n_opt] << "."
63 << "Expecting " << help << "."
69 //////////////////////////////////////////////////////////////////////
71 int previous_visible(int current_line, int nb_lines, char **lines, int nb_patterns, char **patterns) {
72 int line = current_line - 1;
73 while(line >= 0 && !match(lines[line], nb_patterns, patterns)) line--;
77 int next_visible(int current_line, int nb_lines, char **lines, int nb_patterns, char **patterns) {
78 int line = current_line + 1;
79 while(line < nb_lines && !match(lines[line], nb_patterns, patterns)) line++;
87 void update_screen(int *current_line, int *temporary_line, int motion,
88 int nb_lines, char **lines,
92 char buffer[buffer_size];
94 // We split the pattern list into individual patterns
98 for(char *s = pattern_list; *s; s++) {
99 if(*s == pattern_separator) {
104 char splitted_patterns[strlen(pattern_list) + 1];
105 char *patterns[nb_patterns];
107 strcpy(splitted_patterns, pattern_list);
110 char *last_pattern_start = splitted_patterns;
111 for(char *s = splitted_patterns; n < nb_patterns; s++) {
112 if(*s == pattern_separator || *s == '\0') {
114 patterns[n++] = last_pattern_start;
115 last_pattern_start = s + 1;
119 // We now take care of printing the lines per se
121 int console_width = getmaxx(stdscr);
122 int console_height = getmaxy(stdscr);
124 int nb_printed_lines = 1;
126 // First, we find a visible line. In priority: The current, or the
127 // first visible after it, or the first visible before it.
130 if(match(lines[*current_line], nb_patterns, patterns)) {
131 new_line = *current_line;
133 new_line = next_visible(*current_line, nb_lines, lines, nb_patterns, patterns);
135 new_line = previous_visible(*current_line, nb_lines, lines, nb_patterns, patterns);
139 // If we found a visible line and we should move, let's move
141 if(new_line >= 0 && motion != 0) {
144 // We want to go down, let's find the first visible line below
145 for(int m = 0; l >= 0 && m < motion; m++) {
146 l = next_visible(l, nb_lines, lines, nb_patterns, patterns);
152 // We want to go up, let's find the first visible line above
153 for(int m = 0; l >= 0 && m < -motion; m++) {
154 l = previous_visible(l, nb_lines, lines, nb_patterns, patterns);
166 use_default_colors();
170 // Here new_line is either a line number matching the patterns, or -1
174 int first_line = new_line, last_line = new_line, nb_match = 1;
176 // We find the first and last line to show, so that the total of
177 // visible lines between them (them include) is console_height - 1
179 while(nb_match < console_height-1 && (first_line > 0 || last_line < nb_lines - 1)) {
183 while(first_line > 0 && !match(lines[first_line], nb_patterns, patterns)) {
186 if(match(lines[first_line], nb_patterns, patterns)) {
191 if(last_line < nb_lines - 1) {
193 while(last_line < nb_lines - 1 && !match(lines[last_line], nb_patterns, patterns)) {
197 if(match(lines[last_line], nb_patterns, patterns)) {
203 // Now we display them
205 for(int l = first_line; l <= last_line; l++) {
206 if(match(lines[l], nb_patterns, patterns)) {
209 while(lines[l][k] && k < buffer_size - 2 && k < console_width - 2) {
210 buffer[k] = lines[l][k];
214 // We fill the rest of the line with blanks if either we did
215 // not clear() or if this is the highlighted line
217 if(no_blink || l == new_line) {
218 while(k < console_width) {
226 // Highlight the highlighted line ...
229 attron(COLOR_PAIR(2));
230 addnstr(buffer, console_width);
231 attroff(COLOR_PAIR(2));
233 addnstr(buffer, console_width);
240 *temporary_line = new_line;
242 *current_line = new_line;
246 if(nb_printed_lines == 1) {
247 addnstr("[no selection]\n", console_width);
251 if(no_blink) { // Erase the rest of the window. That's slightly ugly.
253 while(k < console_width) {
258 for(int l = nb_printed_lines; l < console_height; l++) {
259 addnstr(buffer, console_width);
265 sprintf(buffer, "%d/%d pattern: %s",
266 nb_printed_lines - 1,
270 for(int k = strlen(buffer); k < console_width; k++) buffer[k] = ' ';
271 buffer[console_width] = '\0';
274 attron(COLOR_PAIR(1));
275 addnstr(buffer, console_width);
276 attroff(COLOR_PAIR(1));
283 //////////////////////////////////////////////////////////////////////
285 int main(int argc, char **argv) {
286 char buffer[buffer_size];
287 char *lines[nb_lines_max];
290 char input_filename[buffer_size], output_filename[buffer_size];
291 strcpy(input_filename, "/dev/stdin");
292 strcpy(output_filename, "/tmp/selector.out");
296 if(strcmp(argv[i], "-o") == 0) {
297 check_opt(argc, argv, i, 1, "<output filename>");
298 strncpy(output_filename, argv[i+1], buffer_size);
302 else if(strcmp(argv[i], "-s") == 0) {
303 check_opt(argc, argv, i, 1, "<pattern separator>");
304 pattern_separator = argv[i+1][0];
308 else if(strcmp(argv[i], "-v") == 0) {
309 output_to_vt_buffer = 1;
313 else if(strcmp(argv[i], "-f") == 0) {
314 check_opt(argc, argv, i, 1, "<input filename>");
315 strncpy(input_filename, argv[i+1], buffer_size);
319 else if(strcmp(argv[i], "-b") == 0) {
324 else if(strcmp(argv[i], "-l") == 0) {
325 check_opt(argc, argv, i, 1, "<maximum number of lines>");
326 nb_lines_max = atoi(argv[i+1]);
331 cerr << argv[0] << " [-h] [-o <output filename>] [-b] [-l <max number of lines>] [-s <pattern separator>] [-v]" << endl;
332 if(strcmp(argv[i], "-h") == 0) {
340 ifstream file(input_filename);
343 cerr << "Can not open \"" << input_filename << "\"" << endl;
348 while(nb_lines < nb_lines_max && !file.eof()) {
349 file.getline(buffer, buffer_size);
350 lines[nb_lines] = new char[strlen(buffer) + 1];
351 strcpy(lines[nb_lines], buffer);
355 char patterns[buffer_size];
363 cerr << "No colors." << endl;
369 keypad(stdscr, TRUE);
372 // init_pair(1, COLOR_WHITE, COLOR_BLACK);
373 init_pair(1, COLOR_WHITE, COLOR_GREEN);
374 init_pair(2, COLOR_BLACK, COLOR_YELLOW);
378 int current_line = 0, temporary_line = 0;
380 update_screen(¤t_line, &temporary_line, 0, nb_lines, lines, patterns, no_blink);
388 if(key >= ' ' && key <= 'z') {
389 patterns[patterns_point++] = key;
390 patterns[patterns_point] = '\0';
393 else if(key == KEY_BACKSPACE || key == KEY_DC || key == '
\b') {
394 if(patterns_point > 0) {
396 patterns[patterns_point] = '\0';
400 else if(key == KEY_HOME) {
404 else if(key == KEY_END) {
405 current_line = nb_lines - 1;
408 else if(key == KEY_NPAGE) {
412 else if(key == KEY_PPAGE) {
416 else if(key == KEY_UP || key == '
\10') {
420 else if(key == KEY_DOWN || key == '
\ e') {
424 update_screen(¤t_line, &temporary_line, motion,
425 nb_lines, lines, patterns, no_blink);
426 } while(key != '\n' && key != KEY_ENTER && key != '
\a');
432 if(output_to_vt_buffer) {
433 if((key == KEY_ENTER || key == '\n') && temporary_line >= 0 && temporary_line < nb_lines) {
434 char *tty = ttyname (STDIN_FILENO);
435 int fd = open(tty, O_WRONLY);
437 struct termios oldtio, newtio;
440 // Save current port settings
441 tcgetattr(fd,&oldtio);
442 bzero(&newtio, sizeof(newtio));
446 // Set input mode (non-canonical, *no echo*,...)
448 tcflush(fd, TCIFLUSH);
449 tcsetattr(fd,TCSANOW, &newtio);
450 for(char *k = lines[temporary_line]; *k; k++) {
451 ioctl(fd, TIOCSTI, k);
453 // Restore the old settings
454 tcsetattr(fd,TCSANOW, &oldtio);
457 cerr << "Can not open " << tty << endl;
463 ofstream out(output_filename);
465 cerr << "Can not open " << output_filename << " for writing." << endl;
468 if((key == KEY_ENTER || key == '\n') && temporary_line >= 0 && temporary_line < nb_lines) {
469 out << lines[temporary_line] << endl;
477 for(int l = 0; l < nb_lines; l++) {