source: viewwin.c @ 4c0ac34

release-1.7release-1.8release-1.9
Last change on this file since 4c0ac34 was 4c0ac34, checked in by David Benjamin <davidben@mit.edu>, 11 years ago
Don't leak editwins in the viewwin All the objects we pass the editwin to take a reference, but no one ever claims the reference it was initially created with.
  • Property mode set to 100644
File size: 12.5 KB
Line 
1#include <string.h>
2#include "owl.h"
3
4#define BOTTOM_OFFSET 1
5#define EMPTY_INDICATOR "~"
6
7static void owl_viewwin_redraw_content(owl_window *w, WINDOW *curswin, void *user_data);
8static void owl_viewwin_redraw_status(owl_window *w, WINDOW *curswin, void *user_data);
9static void owl_viewwin_layout(owl_viewwin *v);
10static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w);
11
12/* Create a viewwin.  'win' is an already initialized owl_window that
13 * will be used by the viewwin
14 */
15owl_viewwin *owl_viewwin_new_text(owl_window *win, const char *text)
16{
17  owl_viewwin *v = owl_malloc(sizeof(owl_viewwin));
18  memset(v, 0, sizeof(*v));
19  owl_fmtext_init_null(&(v->fmtext));
20  if (text) {
21    owl_fmtext_append_normal(&(v->fmtext), text);
22    if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
23      owl_fmtext_append_normal(&(v->fmtext), "\n");
24    }
25    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
26  }
27  v->topline=0;
28  v->rightshift=0;
29  v->onclose_hook = NULL;
30
31  owl_viewwin_set_window(v, win);
32  return v;
33}
34
35/* Create a viewwin.  'win' is an already initialized owl_window that
36 * will be used by the viewwin
37 */
38owl_viewwin *owl_viewwin_new_fmtext(owl_window *win, const owl_fmtext *fmtext)
39{
40  char *text;
41  owl_viewwin *v = owl_malloc(sizeof(owl_viewwin));
42  memset(v, 0, sizeof(*v));
43
44  owl_fmtext_copy(&(v->fmtext), fmtext);
45  text = owl_fmtext_print_plain(fmtext);
46  if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
47      owl_fmtext_append_normal(&(v->fmtext), "\n");
48  }
49  owl_free(text);
50  v->textlines=owl_fmtext_num_lines(&(v->fmtext));
51  v->topline=0;
52  v->rightshift=0;
53
54  owl_viewwin_set_window(v, win);
55  return v;
56}
57
58static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w)
59{
60  v->window = g_object_ref(w);
61  v->content = owl_window_new(v->window);
62  v->status = owl_window_new(v->window);
63  v->cmdwin = NULL;
64
65  v->sig_content_redraw_id =
66    g_signal_connect(v->content, "redraw", G_CALLBACK(owl_viewwin_redraw_content), v);
67  v->sig_status_redraw_id =
68    g_signal_connect(v->status, "redraw", G_CALLBACK(owl_viewwin_redraw_status), v);
69  v->sig_resize_id =
70    g_signal_connect_swapped(v->window, "resized", G_CALLBACK(owl_viewwin_layout), v);
71  owl_viewwin_layout(v);
72
73  owl_window_show(v->content);
74  owl_window_show(v->status);
75}
76
77void owl_viewwin_set_onclose_hook(owl_viewwin *v, void (*onclose_hook) (owl_viewwin *vwin, void *data), void *onclose_hook_data) {
78  v->onclose_hook = onclose_hook;
79  v->onclose_hook_data = onclose_hook_data;
80}
81
82static void owl_viewwin_layout(owl_viewwin *v)
83{
84  int lines, cols;
85  owl_window_get_position(v->window, &lines, &cols, NULL, NULL);
86  owl_window_set_position(v->content, lines - BOTTOM_OFFSET, cols, 0, 0);
87  /* Only one of these will be visible at a time: */
88  owl_window_set_position(v->status, BOTTOM_OFFSET, cols, lines - BOTTOM_OFFSET, 0);
89  if (v->cmdwin)
90    owl_window_set_position(v->cmdwin, BOTTOM_OFFSET, cols, lines - BOTTOM_OFFSET, 0);
91}
92
93/* regenerate text on the curses window. */
94static void owl_viewwin_redraw_content(owl_window *w, WINDOW *curswin, void *user_data)
95{
96  owl_fmtext fm1, fm2;
97  owl_viewwin *v = user_data;
98  int winlines, wincols;
99  int y;
100
101  owl_window_get_position(w, &winlines, &wincols, 0, 0);
102
103  werase(curswin);
104  wmove(curswin, 0, 0);
105
106  owl_fmtext_init_null(&fm1);
107  owl_fmtext_init_null(&fm2);
108
109  owl_fmtext_truncate_lines(&(v->fmtext), v->topline, winlines, &fm1);
110  owl_fmtext_truncate_cols(&fm1, v->rightshift, wincols-1+v->rightshift, &fm2);
111
112  owl_fmtext_curs_waddstr(&fm2, curswin);
113
114  /* Fill remaining lines with tildes. */
115  y = v->textlines - v->topline;
116  wmove(curswin, y, 0);
117  for (; y < winlines; y++) {
118    waddstr(curswin, EMPTY_INDICATOR);
119    waddstr(curswin, "\n");
120  }
121
122  owl_fmtext_cleanup(&fm1);
123  owl_fmtext_cleanup(&fm2);
124}
125
126static void owl_viewwin_redraw_status(owl_window *w, WINDOW *curswin, void *user_data)
127{
128  owl_viewwin *v = user_data;
129  int winlines, wincols;
130
131  owl_window_get_position(v->content, &winlines, &wincols, 0, 0);
132
133  werase(curswin);
134  wmove(curswin, 0, 0);
135  wattrset(curswin, A_REVERSE);
136  if (v->textlines - v->topline > winlines) {
137    waddstr(curswin, "--More-- (Space to see more, 'q' to quit)");
138  } else {
139    waddstr(curswin, "--End-- (Press 'q' to quit)");
140  }
141  wattroff(curswin, A_REVERSE);
142}
143
144char *owl_viewwin_command_search(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
145{
146  int direction, consider_current;
147  const char *buffstart;
148
149  direction=OWL_DIRECTION_DOWNWARDS;
150  buffstart=skiptokens(buff, 1);
151  if (argc>1 && !strcmp(argv[1], "-r")) {
152    direction=OWL_DIRECTION_UPWARDS;
153    buffstart=skiptokens(buff, 2);
154  }
155
156  if (argc==1 || (argc==2 && !strcmp(argv[1], "-r"))) {
157    consider_current = false;
158  } else {
159    owl_function_set_search(buffstart);
160    consider_current = true;
161  }
162
163  if (!owl_viewwin_search(v, owl_global_get_search_re(&g), consider_current, direction))
164    owl_function_error("No more matches");
165  return NULL;
166}
167
168typedef struct _owl_viewwin_search_data { /*noproto*/
169  owl_viewwin *v;
170  int direction;
171} owl_viewwin_search_data;
172
173static void owl_viewwin_callback_search(owl_editwin *e)
174{
175  int consider_current = false;
176  const char *line = owl_editwin_get_text(e);
177  owl_viewwin_search_data *data = owl_editwin_get_cbdata(e);
178
179  /* Given an empty string, just continue the current search. */
180  if (line && *line) {
181    owl_function_set_search(line);
182    consider_current = true;
183  }
184  if (!owl_viewwin_search(data->v, owl_global_get_search_re(&g),
185                          consider_current, data->direction))
186    owl_function_error("No matches");
187}
188
189char *owl_viewwin_command_start_search(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
190{
191  int direction;
192  const char *buffstart;
193  owl_editwin *tw;
194  owl_context *ctx;
195  owl_viewwin_search_data *data;
196
197  direction=OWL_DIRECTION_DOWNWARDS;
198  buffstart=skiptokens(buff, 1);
199  if (argc>1 && !strcmp(argv[1], "-r")) {
200    direction=OWL_DIRECTION_UPWARDS;
201    buffstart=skiptokens(buff, 2);
202  }
203
204  /* TODO: Add a search history? */
205  tw = owl_viewwin_set_typwin_active(v, NULL);
206  owl_editwin_set_locktext(tw, (direction == OWL_DIRECTION_DOWNWARDS) ? "/" : "?");
207  owl_editwin_insert_string(tw, buffstart);
208
209  data = owl_malloc(sizeof(owl_viewwin_search_data));
210  data->v = v;
211  data->direction = direction;
212
213  ctx = owl_editcontext_new(OWL_CTX_EDITLINE, tw, "editline",
214                            owl_viewwin_deactivate_editcontext, v);
215  ctx->cbdata = v;
216  owl_global_push_context_obj(&g, ctx);
217  owl_editwin_set_callback(tw, owl_viewwin_callback_search);
218  owl_editwin_set_cbdata(tw, data, owl_free);
219  /* We aren't saving tw, so release the reference we were given. */
220  owl_editwin_unref(tw);
221  return NULL;
222}
223
224char *owl_viewwin_start_command(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
225{
226  owl_editwin *tw;
227  owl_context *ctx;
228
229  buff = skiptokens(buff, 1);
230
231  tw = owl_viewwin_set_typwin_active(v, owl_global_get_cmd_history(&g));
232  owl_editwin_set_locktext(tw, ":");
233
234  owl_editwin_insert_string(tw, buff);
235
236  ctx = owl_editcontext_new(OWL_CTX_EDITLINE, tw, "editline",
237                            owl_viewwin_deactivate_editcontext, v);
238  owl_global_push_context_obj(&g, ctx);
239  owl_editwin_set_callback(tw, owl_callback_command);
240  /* We aren't saving tw, so release the reference we were given. */
241  owl_editwin_unref(tw);
242
243  return NULL;
244}
245
246void owl_viewwin_deactivate_editcontext(owl_context *ctx) {
247  owl_viewwin *v = ctx->cbdata;
248  owl_viewwin_set_typwin_inactive(v);
249}
250
251owl_editwin *owl_viewwin_set_typwin_active(owl_viewwin *v, owl_history *hist) {
252  int lines, cols;
253  owl_editwin *cmdline;
254  if (v->cmdwin)
255    return NULL;
256  /* Create the command line. */
257  v->cmdwin = owl_window_new(v->window);
258  owl_viewwin_layout(v);
259  owl_window_get_position(v->cmdwin, &lines, &cols, NULL, NULL);
260  cmdline = owl_editwin_new(v->cmdwin, lines, cols, OWL_EDITWIN_STYLE_ONELINE, hist);
261  /* Swap out the bottom window. */
262  owl_window_hide(v->status);
263  owl_window_show(v->cmdwin);
264  return cmdline;
265}
266
267void owl_viewwin_set_typwin_inactive(owl_viewwin *v) {
268  if (v->cmdwin) {
269    /* Swap out the bottom window. */
270    owl_window_hide(v->cmdwin);
271    owl_window_show(v->status);
272    /* Destroy the window itself. */
273    owl_window_unlink(v->cmdwin);
274    g_object_unref(v->cmdwin);
275    v->cmdwin = NULL;
276  }
277}
278
279void owl_viewwin_append_text(owl_viewwin *v, const char *text) {
280    owl_fmtext_append_normal(&(v->fmtext), text);
281    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
282    owl_viewwin_dirty(v);
283}
284
285/* Schedule a redraw of 'v'. Exported for hooking into the search
286   string; when we have some way of listening for changes, this can be
287   removed. */
288void owl_viewwin_dirty(owl_viewwin *v)
289{
290  owl_window_dirty(v->content);
291  owl_window_dirty(v->status);
292}
293
294void owl_viewwin_down(owl_viewwin *v, int amount) {
295  int winlines;
296  owl_window_get_position(v->content, &winlines, 0, 0, 0);
297  /* Don't scroll past the bottom. */
298  amount = MIN(amount, v->textlines - (v->topline + winlines));
299  /* But if we're already past the bottom, don't back up either. */
300  if (amount > 0) {
301    v->topline += amount;
302    owl_viewwin_dirty(v);
303  }
304}
305
306void owl_viewwin_up(owl_viewwin *v, int amount)
307{
308  v->topline -= amount;
309  if (v->topline<0) v->topline=0;
310  owl_viewwin_dirty(v);
311}
312
313void owl_viewwin_pagedown(owl_viewwin *v)
314{
315  int winlines;
316  owl_window_get_position(v->content, &winlines, 0, 0, 0);
317  owl_viewwin_down(v, winlines);
318}
319
320void owl_viewwin_linedown(owl_viewwin *v)
321{
322  owl_viewwin_down(v, 1);
323}
324
325void owl_viewwin_pageup(owl_viewwin *v)
326{
327  int winlines;
328  owl_window_get_position(v->content, &winlines, 0, 0, 0);
329  owl_viewwin_up(v, winlines);
330}
331
332void owl_viewwin_lineup(owl_viewwin *v)
333{
334  owl_viewwin_up(v, 1);
335}
336
337void owl_viewwin_right(owl_viewwin *v, int n)
338{
339  v->rightshift+=n;
340  owl_viewwin_dirty(v);
341}
342
343void owl_viewwin_left(owl_viewwin *v, int n)
344{
345  v->rightshift-=n;
346  if (v->rightshift<0) v->rightshift=0;
347  owl_viewwin_dirty(v);
348}
349
350void owl_viewwin_top(owl_viewwin *v)
351{
352  v->topline=0;
353  v->rightshift=0;
354  owl_viewwin_dirty(v);
355}
356
357void owl_viewwin_bottom(owl_viewwin *v)
358{
359  int winlines;
360  owl_window_get_position(v->content, &winlines, 0, 0, 0);
361  v->topline = v->textlines - winlines;
362  owl_viewwin_dirty(v);
363}
364
365/* This is a bit of a hack, because regexec doesn't have an 'n'
366 * version. */
367static int _re_memcompare(const owl_regex *re, const char *string, int start, int end)
368{
369  int ans;
370  char *tmp = g_strndup(string + start, end - start);
371  ans = owl_regex_compare(re, tmp, NULL, NULL);
372  g_free(tmp);
373  return !ans;
374}
375
376/* Scroll in 'direction' to the next line containing 're' in 'v',
377 * starting from the current line. Returns 0 if no occurrence is
378 * found.
379 *
380 * If consider_current is true then stay on the current line
381 * if it matches.
382 */
383int owl_viewwin_search(owl_viewwin *v, const owl_regex *re, int consider_current, int direction)
384{
385  int start, end, offset;
386  int lineend, linestart;
387  const char *buf, *linestartp;
388  owl_fmtext_line_extents(&v->fmtext, v->topline, &start, &end);
389  if (direction == OWL_DIRECTION_DOWNWARDS) {
390    offset = owl_fmtext_search(&v->fmtext, re,
391                               consider_current ? start : end);
392    if (offset < 0)
393      return 0;
394    v->topline = owl_fmtext_line_number(&v->fmtext, offset);
395    owl_viewwin_dirty(v);
396    return 1;
397  } else {
398    /* TODO: This is a hack. Really, we should have an owl_fmlines or
399     * something containing an array of owl_fmtext split into
400     * lines. Also, it cannot handle multi-line regex, if we ever care about
401     * them. */
402    buf = owl_fmtext_get_text(&v->fmtext);
403    lineend = consider_current ? end : start;
404    while (lineend > 0) {
405      linestartp = memrchr(buf, '\n', lineend - 1);
406      linestart = linestartp ? linestartp - buf + 1 : 0;
407      if (_re_memcompare(re, buf, linestart, lineend)) {
408        v->topline = owl_fmtext_line_number(&v->fmtext, linestart);
409        owl_viewwin_dirty(v);
410        return 1;
411      }
412      lineend = linestart;
413    }
414    return 0;
415  }
416}
417
418void owl_viewwin_delete(owl_viewwin *v)
419{
420  if (v->onclose_hook) {
421    v->onclose_hook(v, v->onclose_hook_data);
422    v->onclose_hook = NULL;
423    v->onclose_hook_data = NULL;
424  }
425  owl_viewwin_set_typwin_inactive(v);
426  /* TODO: This is far too tedious. owl_viewwin should own v->window
427   * and just unlink it in one go. Signals should also go away for
428   * free. */
429  g_signal_handler_disconnect(v->window, v->sig_resize_id);
430  g_signal_handler_disconnect(v->content, v->sig_content_redraw_id);
431  g_signal_handler_disconnect(v->status, v->sig_status_redraw_id);
432  owl_window_unlink(v->content);
433  owl_window_unlink(v->status);
434  g_object_unref(v->window);
435  g_object_unref(v->content);
436  g_object_unref(v->status);
437  owl_fmtext_cleanup(&(v->fmtext));
438  owl_free(v);
439}
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