spxdec: Use read_u16() from portable_io.h.
[paraslash.git] / interactive.c
1 /* Copyright (C) 2011 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file interactive.c Readline abstraction for interactive sessions. */
4
5 #include "para.h"
6
7 #include <regex.h>
8 #include <readline/readline.h>
9 #include <readline/history.h>
10 #include <sys/ioctl.h>
11 #include <signal.h>
12
13 #include "fd.h"
14 #include "buffer_tree.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "interactive.h"
18 #include "string.h"
19 #include "error.h"
20
21 struct i9e_private {
22 struct i9e_client_info *ici;
23 FILE *stderr_stream;
24 int num_columns;
25 int num_key_bindings;
26 char empty_line[1000];
27 char key_sequence[32];
28 unsigned key_sequence_length;
29 struct task *task;
30 struct btr_node *stdout_btrn;
31 bool last_write_was_status;
32 bool input_eof;
33 bool caught_sigint;
34 bool caught_sigterm;
35 Keymap standard_km;
36 Keymap bare_km;
37 int fd_flags[2];
38 };
39 static struct i9e_private i9e_private, *i9ep = &i9e_private;
40
41 /**
42 * Return the error state of the i9e task.
43 *
44 * This is mainly useful for other tasks to tell whether the i9e task is still
45 * running.
46 *
47 * \return A negative return value of zero means the i9e task terminated. Only
48 * in this case it is safe to call ie9_close().
49 */
50 int i9e_get_error(void)
51 {
52 return task_status(i9ep->task);
53 }
54
55 static bool is_prefix(const char *partial, const char *full, size_t len)
56 {
57 if (len == 0)
58 len = strlen(partial);
59 return !strncmp(partial, full, len);
60 }
61
62 /*
63 * Generator function for command completion. STATE lets us know whether
64 * to start from scratch; without any state (i.e. STATE == 0), then we
65 * start at the top of the list.
66 */
67 static char *command_generator(const char *text, int state)
68 {
69 static int list_index, len;
70 const char *name;
71 struct i9e_client_info *ici = i9ep->ici;
72
73 rl_attempted_completion_over = 1; /* disable filename completion */
74 /*
75 * If this is a new word to complete, initialize now. This includes
76 * saving the length of TEXT for efficiency, and initializing the index
77 * variable to 0.
78 */
79 if (state == 0) {
80 list_index = 0;
81 len = strlen(text);
82 }
83 /* Return the next name which partially matches from the command list. */
84 while ((name = ici->completers[list_index].name)) {
85 list_index++;
86 if (is_prefix(text, name, len))
87 return para_strdup(name);
88 }
89 return NULL; /* no names matched */
90 }
91
92 static void reset_completion_result(struct i9e_completion_result *cr)
93 {
94 cr->dont_append_space = false;
95 cr->filename_completion_desired = false;
96 cr->matches = NULL;
97 }
98
99 static void create_matches(struct i9e_completion_info *ci,
100 struct i9e_completer *completers,
101 struct i9e_completion_result *cr)
102 {
103 int i, ret;
104
105 reset_completion_result(cr);
106
107 ret = create_argv(ci->buffer, " ", &ci->argv);
108 if (ret < 0 || !ci->argv[0])
109 return;
110
111 ci->argc = ret;
112 ci->word_num = compute_word_num(ci->buffer, " ", ci->point);
113 for (i = 0; completers[i].name; i++) {
114 if (strcmp(completers[i].name, ci->argv[0]) != 0)
115 continue;
116 completers[i].completer(ci, cr);
117 break;
118 }
119 PARA_DEBUG_LOG("current word: %d (%s)\n", ci->word_num,
120 ci->argv[ci->word_num]);
121 if (cr->matches)
122 for (i = 0; cr->matches[i]; i++)
123 PARA_DEBUG_LOG("match %d: %s\n", i, cr->matches[i]);
124 }
125
126 static char *completion_generator(const char *word, int state)
127 {
128 static int list_index;
129 static char **argv, **matches;
130 struct i9e_completer *completers = i9ep->ici->completers;
131 struct i9e_completion_info ci = {
132 .word = (char *)word,
133 .point = rl_point,
134 .buffer = rl_line_buffer,
135 };
136 struct i9e_completion_result cr = {.matches = NULL};
137
138 if (state != 0)
139 goto out;
140 /* clean up previous matches and set defaults */
141 free(matches);
142 matches = NULL;
143 free_argv(argv);
144 argv = NULL;
145 list_index = 0;
146 rl_completion_append_character = ' ';
147 rl_completion_suppress_append = false;
148 rl_attempted_completion_over = true;
149
150 create_matches(&ci, completers, &cr);
151
152 matches = cr.matches;
153 argv = ci.argv;
154 rl_completion_suppress_append = cr.dont_append_space;
155 rl_attempted_completion_over = !cr.filename_completion_desired;
156 out:
157 if (!matches)
158 return NULL;
159 return matches[list_index++];
160 }
161
162 /*
163 * Attempt to complete on the contents of TEXT. START and END bound the
164 * region of rl_line_buffer that contains the word to complete. TEXT is
165 * the word to complete. We can use the entire contents of rl_line_buffer
166 * in case we want to do some simple parsing. Return the array of matches,
167 * or NULL if there aren't any.
168 */
169 static char **i9e_completer(const char *text, int start, __a_unused int end)
170 {
171 struct i9e_client_info *ici = i9ep->ici;
172
173 if (!ici->completers)
174 return NULL;
175 /* Complete on command names if this is the first word in the line. */
176 if (start == 0)
177 return rl_completion_matches(text, command_generator);
178 return rl_completion_matches(text, completion_generator);
179 }
180
181 /**
182 * Prepare writing to stdout.
183 *
184 * \param producer The buffer tree node which produces output.
185 *
186 * The i9e subsystem maintains a buffer tree node which may be attached to
187 * another node which generates output (a "producer"). When attached, the i9e
188 * buffer tree node copies the buffers generated by the producer to stdout.
189 *
190 * This function attaches the i9e input queue to an output queue of \a
191 * producer.
192 *
193 * \return Standard.
194 */
195 void i9e_attach_to_stdout(struct btr_node *producer)
196 {
197 btr_remove_node(&i9ep->stdout_btrn);
198 i9ep->stdout_btrn = btr_new_node(&(struct btr_node_description)
199 EMBRACE(.name = "interactive_stdout", .parent = producer));
200 rl_set_keymap(i9ep->bare_km);
201 }
202
203 static void wipe_bottom_line(void)
204 {
205 fprintf(i9ep->stderr_stream, "\r%s\r", i9ep->empty_line);
206 }
207
208 #ifndef RL_FREE_KEYMAP_DECLARED
209 /**
210 * Free all storage associated with a keymap.
211 *
212 * This function is not declared in the readline headers although the symbol is
213 * exported and the function is documented in the readline info file. So we
214 * have to declare it here.
215 *
216 * \param keymap The keymap to deallocate.
217 */
218 void rl_free_keymap(Keymap keymap);
219 #endif
220
221 /**
222 * Reset the terminal and save the in-memory command line history.
223 *
224 * This should be called before the caller exits.
225 */
226 void i9e_close(void)
227 {
228 char *hf = i9ep->ici->history_file;
229
230 rl_free_keymap(i9ep->bare_km);
231 rl_callback_handler_remove();
232 if (hf)
233 write_history(hf);
234 wipe_bottom_line();
235 fcntl(i9ep->ici->fds[0], F_SETFL, i9ep->fd_flags[0]);
236 fcntl(i9ep->ici->fds[1], F_SETFL, i9ep->fd_flags[1]);
237 }
238
239 static void clear_bottom_line(void)
240 {
241 int point;
242 char *text;
243
244 if (rl_point == 0 && rl_end == 0)
245 return wipe_bottom_line();
246 /*
247 * We might have a multi-line input that needs to be wiped here, so the
248 * simple printf("\r<space>\r") is insufficient. To workaround this, we
249 * remove the whole line, redisplay and restore the killed text.
250 */
251 point = rl_point;
252 text = rl_copy_text(0, rl_end);
253 rl_kill_full_line(0, 0);
254 rl_redisplay();
255 wipe_bottom_line(); /* wipe out the prompt */
256 rl_insert_text(text);
257 free(text);
258 rl_point = point;
259 }
260
261 static bool input_available(void)
262 {
263 fd_set rfds;
264 struct timeval tv = {0, 0};
265 int ret;
266
267 FD_ZERO(&rfds);
268 FD_SET(i9ep->ici->fds[0], &rfds);
269 ret = para_select(1, &rfds, NULL, &tv);
270 return ret > 0;
271 }
272
273 static void i9e_line_handler(char *line)
274 {
275 int ret;
276 struct btr_node *dummy;
277
278 if (!line) {
279 i9ep->input_eof = true;
280 return;
281 }
282 if (!*line)
283 goto free_line;
284 rl_set_prompt("");
285 dummy = btr_new_node(&(struct btr_node_description)
286 EMBRACE(.name = "dummy line handler"));
287 i9e_attach_to_stdout(dummy);
288 ret = i9ep->ici->line_handler(line);
289 if (ret < 0)
290 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
291 add_history(line);
292 btr_remove_node(&dummy);
293 free_line:
294 free(line);
295 }
296
297 static int i9e_post_select(__a_unused struct sched *s, __a_unused void *context)
298 {
299 int ret;
300 struct i9e_client_info *ici = i9ep->ici;
301 char *buf;
302 size_t sz, consumed = 0;
303
304 ret = -E_I9E_EOF;
305 if (i9ep->input_eof)
306 goto rm_btrn;
307 ret = -E_I9E_TERM_RQ;
308 if (i9ep->caught_sigterm)
309 goto rm_btrn;
310 ret = 0;
311 if (i9ep->caught_sigint)
312 goto rm_btrn;
313 while (input_available()) {
314 if (i9ep->stdout_btrn) {
315 unsigned len = i9ep->key_sequence_length;
316 assert(len < sizeof(i9ep->key_sequence) - 1);
317 buf = i9ep->key_sequence + len;
318 ret = read(i9ep->ici->fds[0], buf, 1);
319 if (ret < 0) {
320 ret = -ERRNO_TO_PARA_ERROR(errno);
321 goto rm_btrn;
322 }
323 ret = -E_I9E_EOF;
324 if (ret == 0)
325 goto rm_btrn;
326 buf[1] = '\0';
327 i9ep->key_sequence_length++;
328 rl_stuff_char((int)(unsigned char)*buf);
329 }
330 rl_callback_read_char();
331 ret = 0;
332 }
333 if (!i9ep->stdout_btrn)
334 goto out;
335 ret = btr_node_status(i9ep->stdout_btrn, 0, BTR_NT_LEAF);
336 if (ret < 0) {
337 ret = 0;
338 goto rm_btrn;
339 }
340 if (ret == 0)
341 goto out;
342 again:
343 sz = btr_next_buffer(i9ep->stdout_btrn, &buf);
344 if (sz == 0)
345 goto out;
346 if (i9ep->last_write_was_status)
347 fprintf(i9ep->stderr_stream, "\n");
348 i9ep->last_write_was_status = false;
349 ret = xwrite(ici->fds[1], buf, sz);
350 if (ret < 0)
351 goto rm_btrn;
352 btr_consume(i9ep->stdout_btrn, ret);
353 consumed += ret;
354 if (ret == sz && consumed < 10000)
355 goto again;
356 goto out;
357 rm_btrn:
358 if (i9ep->stdout_btrn) {
359 wipe_bottom_line();
360 btr_remove_node(&i9ep->stdout_btrn);
361 rl_set_keymap(i9ep->standard_km);
362 rl_set_prompt(i9ep->ici->prompt);
363 rl_redisplay();
364 }
365 if (ret < 0)
366 wipe_bottom_line();
367 out:
368 i9ep->caught_sigint = false;
369 return ret;
370 }
371
372 static void i9e_pre_select(struct sched *s, __a_unused void *context)
373 {
374 int ret;
375
376 if (i9ep->input_eof || i9ep->caught_sigint || i9ep->caught_sigterm) {
377 sched_min_delay(s);
378 return;
379 }
380 if (i9ep->stdout_btrn) {
381 ret = btr_node_status(i9ep->stdout_btrn, 0, BTR_NT_LEAF);
382 if (ret < 0) {
383 sched_min_delay(s);
384 return;
385 }
386 if (ret > 0)
387 para_fd_set(i9ep->ici->fds[1], &s->wfds, &s->max_fileno);
388 }
389 /*
390 * fd[0] might have been reset to blocking mode if our job was moved to
391 * the background due to CTRL-Z or SIGSTOP, so set the fd back to
392 * nonblocking mode.
393 */
394 ret = mark_fd_nonblocking(i9ep->ici->fds[0]);
395 if (ret < 0)
396 PARA_WARNING_LOG("set to nonblock failed: (fd0 %d, %s)\n",
397 i9ep->ici->fds[0], para_strerror(-ret));
398 para_fd_set(i9ep->ici->fds[0], &s->rfds, &s->max_fileno);
399 }
400
401 static void update_winsize(void)
402 {
403 struct winsize w;
404 int ret = ioctl(i9ep->ici->fds[2], TIOCGWINSZ, (char *)&w);
405
406 if (ret >= 0) {
407 assert(w.ws_col < sizeof(i9ep->empty_line));
408 i9ep->num_columns = w.ws_col;
409 } else
410 i9ep->num_columns = 80;
411
412 memset(i9ep->empty_line, ' ', i9ep->num_columns);
413 i9ep->empty_line[i9ep->num_columns] = '\0';
414 }
415
416 static int dispatch_key(__a_unused int count, __a_unused int key)
417 {
418 int i, ret;
419
420 again:
421 if (i9ep->key_sequence_length == 0)
422 return 0;
423 for (i = i9ep->num_key_bindings - 1; i >= 0; i--) {
424 if (strcmp(i9ep->key_sequence, i9ep->ici->bound_keyseqs[i]))
425 continue;
426 i9ep->key_sequence[0] = '\0';
427 i9ep->key_sequence_length = 0;
428 ret = i9ep->ici->key_handler(i);
429 return ret < 0? ret : 0;
430 }
431 PARA_WARNING_LOG("ignoring key %d\n", i9ep->key_sequence[0]);
432 /*
433 * We received an undefined key sequence. Throw away the first byte,
434 * and try to parse the remainder.
435 */
436 memmove(i9ep->key_sequence, i9ep->key_sequence + 1,
437 i9ep->key_sequence_length); /* move also terminating zero byte */
438 i9ep->key_sequence_length--;
439 goto again;
440 }
441
442 /**
443 * Register the i9e task and initialize readline.
444 *
445 * \param ici The i9e configuration parameters set by the caller.
446 * \param s The scheduler instance to add the i9e task to.
447 *
448 * The caller must allocate and initialize the structure \a ici points to.
449 *
450 * \return Standard.
451 */
452 int i9e_open(struct i9e_client_info *ici, struct sched *s)
453 {
454 int ret;
455
456 memset(i9ep, 0, sizeof(struct i9e_private));
457 if (!isatty(ici->fds[0]))
458 return -E_I9E_SETUPTERM;
459 ret = fcntl(ici->fds[0], F_GETFL);
460 if (ret < 0)
461 return -E_I9E_SETUPTERM;
462 i9ep->fd_flags[0] = ret;
463 ret = fcntl(ici->fds[1], F_GETFL);
464 if (ret < 0)
465 return -E_I9E_SETUPTERM;
466 i9ep->fd_flags[1] = ret;
467 ret = mark_fd_nonblocking(ici->fds[0]);
468 if (ret < 0)
469 return ret;
470 ret = mark_fd_nonblocking(ici->fds[1]);
471 if (ret < 0)
472 return ret;
473 i9ep->task = task_register(&(struct task_info) {
474 .name = "i9e",
475 .pre_select = i9e_pre_select,
476 .post_select = i9e_post_select,
477 .context = i9ep,
478 }, s);
479
480 rl_readline_name = "para_i9e";
481 rl_basic_word_break_characters = " ";
482 rl_attempted_completion_function = i9e_completer;
483 i9ep->ici = ici;
484 i9ep->stderr_stream = fdopen(ici->fds[2], "w");
485 setvbuf(i9ep->stderr_stream, NULL, _IONBF, 0);
486
487 i9ep->standard_km = rl_get_keymap();
488 i9ep->bare_km = rl_make_bare_keymap();
489 if (ici->bound_keyseqs) {
490 char *seq;
491 int i;
492 /* bind each key sequence to our dispatcher */
493 for (i = 0; (seq = ici->bound_keyseqs[i]); i++) {
494 if (strlen(seq) >= sizeof(i9ep->key_sequence) - 1) {
495 PARA_WARNING_LOG("ignoring overlong key %s\n",
496 seq);
497 continue;
498 }
499 if (rl_bind_keyseq_in_map(seq,
500 dispatch_key, i9ep->bare_km) != 0)
501 PARA_WARNING_LOG("could not bind #%d: %s\n", i, seq);
502 }
503 i9ep->num_key_bindings = i;
504 }
505 if (ici->history_file)
506 read_history(ici->history_file);
507 update_winsize();
508 if (ici->producer) {
509 rl_callback_handler_install("", i9e_line_handler);
510 i9e_attach_to_stdout(ici->producer);
511 } else
512 rl_callback_handler_install(i9ep->ici->prompt, i9e_line_handler);
513 return 1;
514 }
515
516 static void reset_line_state(void)
517 {
518 if (i9ep->stdout_btrn)
519 return;
520 rl_on_new_line();
521 rl_reset_line_state();
522 rl_forced_update_display();
523 }
524
525 /**
526 * The log function of the i9e subsystem.
527 *
528 * \param ll Severity log level.
529 * \param fmt Printf-like format string.
530 *
531 * This clears the bottom line of the terminal if necessary and writes the
532 * string given by \a fmt to fd[2], where fd[] is the array provided earlier in
533 * \ref i9e_open().
534 */
535 __printf_2_3 void i9e_log(int ll, const char* fmt,...)
536 {
537 va_list argp;
538
539 if (ll < i9ep->ici->loglevel)
540 return;
541 clear_bottom_line();
542 va_start(argp, fmt);
543 vfprintf(i9ep->stderr_stream, fmt, argp);
544 va_end(argp);
545 reset_line_state();
546 i9ep->last_write_was_status = false;
547 }
548
549 /**
550 * Print the current status to stderr.
551 *
552 * \param buf The text to print.
553 * \param len The number of bytes in \a buf.
554 *
555 * This clears the bottom line, moves to the beginning of the line and prints
556 * the given text. If the length of this text exceeds the width of the
557 * terminal, the text is shortened by leaving out a part in the middle.
558 */
559 void ie9_print_status_bar(char *buf, unsigned len)
560 {
561 size_t x = i9ep->num_columns, y = (x - 4) / 2;
562
563 assert(x >= 6);
564 if (len > x) {
565 buf[y] = '\0';
566 fprintf(i9ep->stderr_stream, "\r%s", buf);
567 fprintf(i9ep->stderr_stream, " .. ");
568 fprintf(i9ep->stderr_stream, "%s", buf + len - y);
569 } else {
570 char scratch[1000];
571
572 y = x - len;
573 scratch[0] = '\r';
574 strcpy(scratch + 1, buf);
575 memset(scratch + 1 + len, ' ', y);
576 scratch[1 + len + y] = '\r';
577 scratch[2 + len + y] = '\0';
578 fprintf(i9ep->stderr_stream, "\r%s", scratch);
579 }
580 i9ep->last_write_was_status = true;
581 }
582
583 /**
584 * Tell i9e that the caller received a signal.
585 *
586 * \param sig_num The number of the signal received.
587 */
588 void i9e_signal_dispatch(int sig_num)
589 {
590 if (sig_num == SIGWINCH)
591 return update_winsize();
592 if (sig_num == SIGINT) {
593 fprintf(i9ep->stderr_stream, "\n");
594 rl_replace_line ("", false /* clear_undo */);
595 reset_line_state();
596 i9ep->caught_sigint = true;
597 }
598 if (sig_num == SIGTERM)
599 i9ep->caught_sigterm = true;
600 }
601
602 /**
603 * Wrapper for select(2) which does not restart on interrupts.
604 *
605 * \param n \sa \ref para_select().
606 * \param readfds \sa \ref para_select().
607 * \param writefds \sa \ref para_select().
608 * \param timeout_tv \sa \ref para_select().
609 *
610 * \return \sa \ref para_select().
611 *
612 * The only difference between this function and \ref para_select() is that
613 * \ref i9e_select() returns zero if the select call returned \p EINTR.
614 */
615 int i9e_select(int n, fd_set *readfds, fd_set *writefds,
616 struct timeval *timeout_tv)
617 {
618 int ret = select(n, readfds, writefds, NULL, timeout_tv);
619
620 if (ret < 0) {
621 if (errno == EINTR)
622 ret = 0;
623 else
624 ret = -ERRNO_TO_PARA_ERROR(errno);
625 }
626 return ret;
627 }
628
629 /**
630 * Return the possible completions for a given word.
631 *
632 * \param word The word to complete.
633 * \param string_list All possible words in this context.
634 * \param result String list is returned here.
635 *
636 * This function never fails. If no completion was found, a string list of
637 * length zero is returned. In any case, the result must be freed by the caller
638 * using \ref free_argv().
639 *
640 * This function is independent of readline and may be called before
641 * i9e_open().
642 *
643 * \return The number of possible completions.
644 */
645 int i9e_extract_completions(const char *word, char **string_list,
646 char ***result)
647 {
648 char **matches = para_malloc(sizeof(char *));
649 int match_count = 0, matches_len = 1;
650 char **p;
651 int len = strlen(word);
652
653 for (p = string_list; *p; p++) {
654 if (!is_prefix(word, *p, len))
655 continue;
656 match_count++;
657 if (match_count >= matches_len) {
658 matches_len *= 2;
659 matches = para_realloc(matches,
660 matches_len * sizeof(char *));
661 }
662 matches[match_count - 1] = para_strdup(*p);
663 }
664 matches[match_count] = NULL;
665 *result = matches;
666 return match_count;
667 }
668
669 /**
670 * Return the list of partially matching words.
671 *
672 * \param word The command to complete.
673 * \param completers The array containing all command names.
674 *
675 * This is similar to \ref i9e_extract_completions(), but completes on the
676 * command names in \a completers.
677 *
678 * \return See \ref i9e_extract_completions().
679 */
680 char **i9e_complete_commands(const char *word, struct i9e_completer *completers)
681 {
682 char **matches;
683 const char *cmd;
684 int i, match_count, len = strlen(word);
685
686 /*
687 * In contrast to completing against an arbitrary string list, here we
688 * know all possible completions and expect that there will not be many
689 * of them. So it should be OK to iterate twice over all commands which
690 * simplifies the code a bit.
691 */
692 for (i = 0, match_count = 0; (cmd = completers[i].name); i++) {
693 if (is_prefix(word, cmd, len))
694 match_count++;
695 }
696 matches = para_malloc((match_count + 1) * sizeof(*matches));
697 for (i = 0, match_count = 0; (cmd = completers[i].name); i++)
698 if (is_prefix(word, cmd, len))
699 matches[match_count++] = para_strdup(cmd);
700 matches[match_count] = NULL;
701 return matches;
702 }
703
704 /**
705 * Complete according to the given options.
706 *
707 * \param opts All available options.
708 * \param ci Information which was passed to the completer.
709 * \param cr Result pointer.
710 *
711 * This convenience helper can be used to complete an option. The array of all
712 * possible options is passed as the first argument. Flags, i.e. options
713 * without an argument, are expected to be listed as strings of type "-X" in \a
714 * opts while options which require an argument should be passed with a
715 * trailing "=" character like "-X=".
716 *
717 * If the word can be uniquely completed to a flag option, an additional space
718 * character is appended to the output. For non-flag options no space character
719 * is appended.
720 */
721 void i9e_complete_option(char **opts, struct i9e_completion_info *ci,
722 struct i9e_completion_result *cr)
723 {
724 int num_matches;
725
726 num_matches = i9e_extract_completions(ci->word, opts, &cr->matches);
727 if (num_matches == 1) {
728 char *opt = cr->matches[0];
729 char c = opt[strlen(opt) - 1];
730 if (c == '=')
731 cr->dont_append_space = true;
732 }
733 }
734
735 /**
736 * Print possible completions to stdout.
737 *
738 * \param completers The array of completion functions.
739 *
740 * At the end of the output a line starting with "-o=", followed by the
741 * (possibly empty) list of completion options is printed. Currently, the only
742 * two completion options are "nospace" and "filenames". The former indicates
743 * that no space should be appended even for a unique match while the latter
744 * indicates that usual filename completion should be performed in addition to
745 * the previously printed options.
746 *
747 * \return Standard.
748 */
749 int i9e_print_completions(struct i9e_completer *completers)
750 {
751 struct i9e_completion_result cr;
752 struct i9e_completion_info ci;
753 char *buf;
754 const char *end, *p;
755 int i, n, ret;
756
757 reset_completion_result(&cr);
758 buf = getenv("COMP_POINT");
759 ci.point = buf? atoi(buf) : 0;
760 ci.buffer = para_strdup(getenv("COMP_LINE"));
761
762 ci.argc = create_argv(ci.buffer, " ", &ci.argv);
763 ci.word_num = compute_word_num(ci.buffer, " ", ci.point);
764
765 end = ci.buffer + ci.point;
766 for (p = end; p > ci.buffer && *p != ' '; p--)
767 ; /* nothing */
768 if (*p == ' ')
769 p++;
770
771 n = end - p + 1;
772 ci.word = para_malloc(n + 1);
773 strncpy(ci.word, p, n);
774 ci.word[n] = '\0';
775
776 PARA_DEBUG_LOG("line: %s, point: %d (%c), wordnum: %d, word: %s\n",
777 ci.buffer, ci.point, ci.buffer[ci.point], ci.word_num, ci.word);
778 if (ci.word_num == 0)
779 cr.matches = i9e_complete_commands(ci.word, completers);
780 else
781 create_matches(&ci, completers, &cr);
782 ret = 0;
783 if (cr.matches && cr.matches[0]) {
784 for (i = 0; cr.matches[i]; i++)
785 printf("%s\n", cr.matches[i]);
786 ret = 1;
787 }
788 printf("-o=");
789 if (cr.dont_append_space)
790 printf("nospace");
791 if (cr.filename_completion_desired)
792 printf(",filenames");
793 printf("\n");
794 free_argv(cr.matches);
795 free_argv(ci.argv);
796 free(ci.buffer);
797 free(ci.word);
798 return ret;
799 }