source: viewwin.c

Last change on this file was 7dcef03, checked in by Anders Kaseorg <andersk@mit.edu>, 4 years ago
Use the Glib slice allocator for fixed-size objects The slice allocator, available since GLib 2.10, is more space-efficient than [g_]malloc. Since BarnOwl is obviously at the leading edge of space-efficient technology, this seems like a natural fit. Use it for every fixed-size object except owl_viewwin_search_data (which would need an extra destroy_cbdata function to g_slice_free it). Signed-off-by: Anders Kaseorg <andersk@mit.edu>
  • Property mode set to 100644
File size: 12.3 KB
Line 
1#include "owl.h"
2
3#define BOTTOM_OFFSET 1
4
5static void owl_viewwin_redraw_content(owl_window *w, WINDOW *curswin, void *user_data);
6static void owl_viewwin_redraw_status(owl_window *w, WINDOW *curswin, void *user_data);
7static void owl_viewwin_layout(owl_viewwin *v);
8static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w);
9
10/* Create a viewwin.  'win' is an already initialized owl_window that
11 * will be used by the viewwin
12 */
13CALLER_OWN owl_viewwin *owl_viewwin_new_text(owl_window *win, const char *text)
14{
15  owl_viewwin *v = g_slice_new0(owl_viewwin);
16  owl_fmtext_init_null(&(v->fmtext));
17  if (text) {
18    owl_fmtext_append_normal(&(v->fmtext), text);
19    if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
20      owl_fmtext_append_normal(&(v->fmtext), "\n");
21    }
22    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
23  }
24  v->topline=0;
25  v->rightshift=0;
26  v->onclose_hook = NULL;
27
28  owl_viewwin_set_window(v, win);
29  return v;
30}
31
32/* Create a viewwin.  'win' is an already initialized owl_window that
33 * will be used by the viewwin
34 */
35CALLER_OWN owl_viewwin *owl_viewwin_new_fmtext(owl_window *win, const owl_fmtext *fmtext)
36{
37  char *text;
38  owl_viewwin *v = g_slice_new0(owl_viewwin);
39
40  owl_fmtext_copy(&(v->fmtext), fmtext);
41  text = owl_fmtext_print_plain(fmtext);
42  if (text[0] != '\0' && text[strlen(text) - 1] != '\n') {
43      owl_fmtext_append_normal(&(v->fmtext), "\n");
44  }
45  g_free(text);
46  v->textlines=owl_fmtext_num_lines(&(v->fmtext));
47  v->topline=0;
48  v->rightshift=0;
49
50  owl_viewwin_set_window(v, win);
51  return v;
52}
53
54static void owl_viewwin_set_window(owl_viewwin *v, owl_window *w)
55{
56  v->window = g_object_ref(w);
57  v->content = owl_window_new(v->window);
58  v->status = owl_window_new(v->window);
59  v->cmdwin = NULL;
60
61  v->sig_content_redraw_id =
62    g_signal_connect(v->content, "redraw", G_CALLBACK(owl_viewwin_redraw_content), v);
63  v->sig_status_redraw_id =
64    g_signal_connect(v->status, "redraw", G_CALLBACK(owl_viewwin_redraw_status), v);
65  v->sig_resize_id =
66    g_signal_connect_swapped(v->window, "resized", G_CALLBACK(owl_viewwin_layout), v);
67  owl_viewwin_layout(v);
68
69  owl_window_show(v->content);
70  owl_window_show(v->status);
71}
72
73void owl_viewwin_set_onclose_hook(owl_viewwin *v, void (*onclose_hook) (owl_viewwin *vwin, void *data), void *onclose_hook_data) {
74  v->onclose_hook = onclose_hook;
75  v->onclose_hook_data = onclose_hook_data;
76}
77
78static void owl_viewwin_layout(owl_viewwin *v)
79{
80  int lines, cols;
81  owl_window_get_position(v->window, &lines, &cols, NULL, NULL);
82  owl_window_set_position(v->content, lines - BOTTOM_OFFSET, cols, 0, 0);
83  /* Only one of these will be visible at a time: */
84  owl_window_set_position(v->status, BOTTOM_OFFSET, cols, lines - BOTTOM_OFFSET, 0);
85  if (v->cmdwin)
86    owl_window_set_position(v->cmdwin, BOTTOM_OFFSET, cols, lines - BOTTOM_OFFSET, 0);
87}
88
89/* regenerate text on the curses window. */
90static void owl_viewwin_redraw_content(owl_window *w, WINDOW *curswin, void *user_data)
91{
92  owl_fmtext fm1, fm2;
93  owl_viewwin *v = user_data;
94  int winlines, wincols;
95
96  owl_window_get_position(w, &winlines, &wincols, 0, 0);
97
98  werase(curswin);
99  wmove(curswin, 0, 0);
100
101  owl_fmtext_init_null(&fm1);
102  owl_fmtext_init_null(&fm2);
103
104  owl_fmtext_truncate_lines(&(v->fmtext), v->topline, winlines, &fm1);
105  owl_fmtext_truncate_cols(&fm1, v->rightshift, wincols-1+v->rightshift, &fm2);
106
107  owl_fmtext_curs_waddstr(&fm2, curswin, OWL_FMTEXT_ATTR_NONE, OWL_COLOR_DEFAULT, OWL_COLOR_DEFAULT);
108
109  owl_fmtext_cleanup(&fm1);
110  owl_fmtext_cleanup(&fm2);
111}
112
113static void owl_viewwin_redraw_status(owl_window *w, WINDOW *curswin, void *user_data)
114{
115  owl_viewwin *v = user_data;
116  int winlines, wincols;
117
118  owl_window_get_position(v->content, &winlines, &wincols, 0, 0);
119
120  werase(curswin);
121  wmove(curswin, 0, 0);
122  wattrset(curswin, A_REVERSE);
123  if (v->textlines - v->topline > winlines) {
124    waddstr(curswin, "--More-- (Space to see more, 'q' to quit)");
125  } else {
126    waddstr(curswin, "--End-- (Press 'q' to quit)");
127  }
128  wattroff(curswin, A_REVERSE);
129}
130
131char *owl_viewwin_command_search(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
132{
133  int direction, consider_current;
134  const char *buffstart;
135
136  direction=OWL_DIRECTION_DOWNWARDS;
137  buffstart=skiptokens(buff, 1);
138  if (argc>1 && !strcmp(argv[1], "-r")) {
139    direction=OWL_DIRECTION_UPWARDS;
140    buffstart=skiptokens(buff, 2);
141  }
142
143  if (argc==1 || (argc==2 && !strcmp(argv[1], "-r"))) {
144    consider_current = false;
145  } else {
146    owl_function_set_search(buffstart);
147    consider_current = true;
148  }
149
150  if (!owl_viewwin_search(v, owl_global_get_search_re(&g), consider_current, direction))
151    owl_function_makemsg("No more matches");
152  return NULL;
153}
154
155typedef struct _owl_viewwin_search_data { /*noproto*/
156  owl_viewwin *v;
157  int direction;
158} owl_viewwin_search_data;
159
160static void owl_viewwin_callback_search(owl_editwin *e, bool success)
161{
162  if (!success) return;
163  int consider_current = false;
164  const char *line = owl_editwin_get_text(e);
165  owl_viewwin_search_data *data = owl_editwin_get_cbdata(e);
166
167  /* Given an empty string, just continue the current search. */
168  if (line && *line) {
169    owl_function_set_search(line);
170    consider_current = true;
171  }
172  if (!owl_viewwin_search(data->v, owl_global_get_search_re(&g),
173                          consider_current, data->direction))
174    owl_function_makemsg("No matches");
175}
176
177char *owl_viewwin_command_start_search(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
178{
179  int direction;
180  const char *buffstart;
181  owl_editwin *tw;
182  owl_context *ctx;
183  owl_viewwin_search_data *data;
184
185  direction=OWL_DIRECTION_DOWNWARDS;
186  buffstart=skiptokens(buff, 1);
187  if (argc>1 && !strcmp(argv[1], "-r")) {
188    direction=OWL_DIRECTION_UPWARDS;
189    buffstart=skiptokens(buff, 2);
190  }
191
192  /* TODO: Add a search history? */
193  tw = owl_viewwin_set_typwin_active(v, NULL);
194  owl_editwin_set_locktext(tw, (direction == OWL_DIRECTION_DOWNWARDS) ? "/" : "?");
195  owl_editwin_insert_string(tw, buffstart);
196
197  data = g_new(owl_viewwin_search_data, 1);
198  data->v = v;
199  data->direction = direction;
200
201  ctx = owl_editcontext_new(OWL_CTX_EDITLINE, tw, "editline",
202                            owl_viewwin_deactivate_editcontext, v);
203  ctx->cbdata = v;
204  owl_global_push_context_obj(&g, ctx);
205  owl_editwin_set_callback(tw, owl_viewwin_callback_search);
206  owl_editwin_set_cbdata(tw, data, g_free);
207  /* We aren't saving tw, so release the reference we were given. */
208  owl_editwin_unref(tw);
209  return NULL;
210}
211
212char *owl_viewwin_start_command(owl_viewwin *v, int argc, const char *const *argv, const char *buff)
213{
214  owl_editwin *tw;
215  owl_context *ctx;
216
217  buff = skiptokens(buff, 1);
218
219  tw = owl_viewwin_set_typwin_active(v, owl_global_get_cmd_history(&g));
220  owl_editwin_set_locktext(tw, ":");
221
222  owl_editwin_insert_string(tw, buff);
223
224  ctx = owl_editcontext_new(OWL_CTX_EDITLINE, tw, "editline",
225                            owl_viewwin_deactivate_editcontext, v);
226  owl_global_push_context_obj(&g, ctx);
227  owl_editwin_set_callback(tw, owl_callback_command);
228  /* We aren't saving tw, so release the reference we were given. */
229  owl_editwin_unref(tw);
230
231  return NULL;
232}
233
234void owl_viewwin_deactivate_editcontext(owl_context *ctx) {
235  owl_viewwin *v = ctx->cbdata;
236  owl_viewwin_set_typwin_inactive(v);
237}
238
239CALLER_OWN owl_editwin *owl_viewwin_set_typwin_active(owl_viewwin *v, owl_history *hist) {
240  int lines, cols;
241  owl_editwin *cmdline;
242  if (v->cmdwin)
243    return NULL;
244  /* Create the command line. */
245  v->cmdwin = owl_window_new(v->window);
246  owl_viewwin_layout(v);
247  owl_window_get_position(v->cmdwin, &lines, &cols, NULL, NULL);
248  cmdline = owl_editwin_new(v->cmdwin, lines, cols, OWL_EDITWIN_STYLE_ONELINE, hist);
249  /* Swap out the bottom window. */
250  owl_window_hide(v->status);
251  owl_window_show(v->cmdwin);
252  return cmdline;
253}
254
255void owl_viewwin_set_typwin_inactive(owl_viewwin *v) {
256  if (v->cmdwin) {
257    /* Swap out the bottom window. */
258    owl_window_hide(v->cmdwin);
259    owl_window_show(v->status);
260    /* Destroy the window itself. */
261    owl_window_unlink(v->cmdwin);
262    g_object_unref(v->cmdwin);
263    v->cmdwin = NULL;
264  }
265}
266
267void owl_viewwin_append_text(owl_viewwin *v, const char *text) {
268    owl_fmtext_append_normal(&(v->fmtext), text);
269    v->textlines=owl_fmtext_num_lines(&(v->fmtext));
270    owl_viewwin_dirty(v);
271}
272
273/* Schedule a redraw of 'v'. Exported for hooking into the search
274   string; when we have some way of listening for changes, this can be
275   removed. */
276void owl_viewwin_dirty(owl_viewwin *v)
277{
278  owl_window_dirty(v->content);
279  owl_window_dirty(v->status);
280}
281
282void owl_viewwin_down(owl_viewwin *v, int amount) {
283  int winlines;
284  owl_window_get_position(v->content, &winlines, 0, 0, 0);
285  /* Don't scroll past the bottom. */
286  amount = MIN(amount, v->textlines - (v->topline + winlines));
287  /* But if we're already past the bottom, don't back up either. */
288  if (amount > 0) {
289    v->topline += amount;
290    owl_viewwin_dirty(v);
291  }
292}
293
294void owl_viewwin_up(owl_viewwin *v, int amount)
295{
296  v->topline -= amount;
297  if (v->topline<0) v->topline=0;
298  owl_viewwin_dirty(v);
299}
300
301void owl_viewwin_pagedown(owl_viewwin *v)
302{
303  int winlines;
304  owl_window_get_position(v->content, &winlines, 0, 0, 0);
305  owl_viewwin_down(v, winlines);
306}
307
308void owl_viewwin_linedown(owl_viewwin *v)
309{
310  owl_viewwin_down(v, 1);
311}
312
313void owl_viewwin_pageup(owl_viewwin *v)
314{
315  int winlines;
316  owl_window_get_position(v->content, &winlines, 0, 0, 0);
317  owl_viewwin_up(v, winlines);
318}
319
320void owl_viewwin_lineup(owl_viewwin *v)
321{
322  owl_viewwin_up(v, 1);
323}
324
325void owl_viewwin_right(owl_viewwin *v, int n)
326{
327  v->rightshift+=n;
328  owl_viewwin_dirty(v);
329}
330
331void owl_viewwin_left(owl_viewwin *v, int n)
332{
333  v->rightshift-=n;
334  if (v->rightshift<0) v->rightshift=0;
335  owl_viewwin_dirty(v);
336}
337
338void owl_viewwin_top(owl_viewwin *v)
339{
340  v->topline=0;
341  v->rightshift=0;
342  owl_viewwin_dirty(v);
343}
344
345void owl_viewwin_bottom(owl_viewwin *v)
346{
347  int winlines;
348  owl_window_get_position(v->content, &winlines, 0, 0, 0);
349  v->topline = v->textlines - winlines;
350  owl_viewwin_dirty(v);
351}
352
353/* This is a bit of a hack, because regexec doesn't have an 'n'
354 * version. */
355static int _re_memcompare(const owl_regex *re, const char *string, int start, int end)
356{
357  int ans;
358  char *tmp = g_strndup(string + start, end - start);
359  ans = owl_regex_compare(re, tmp, NULL, NULL);
360  g_free(tmp);
361  return !ans;
362}
363
364/* Scroll in 'direction' to the next line containing 're' in 'v',
365 * starting from the current line. Returns 0 if no occurrence is
366 * found.
367 *
368 * If consider_current is true then stay on the current line
369 * if it matches.
370 */
371int owl_viewwin_search(owl_viewwin *v, const owl_regex *re, int consider_current, int direction)
372{
373  int start, end, offset;
374  int lineend, linestart;
375  const char *buf, *linestartp;
376  owl_fmtext_line_extents(&v->fmtext, v->topline, &start, &end);
377  if (direction == OWL_DIRECTION_DOWNWARDS) {
378    offset = owl_fmtext_search(&v->fmtext, re,
379                               consider_current ? start : end);
380    if (offset < 0)
381      return 0;
382    v->topline = owl_fmtext_line_number(&v->fmtext, offset);
383    owl_viewwin_dirty(v);
384    return 1;
385  } else {
386    /* TODO: This is a hack. Really, we should have an owl_fmlines or
387     * something containing an array of owl_fmtext split into
388     * lines. Also, it cannot handle multi-line regex, if we ever care about
389     * them. */
390    buf = owl_fmtext_get_text(&v->fmtext);
391    lineend = consider_current ? end : start;
392    while (lineend > 0) {
393      linestartp = memrchr(buf, '\n', lineend - 1);
394      linestart = linestartp ? linestartp - buf + 1 : 0;
395      if (_re_memcompare(re, buf, linestart, lineend)) {
396        v->topline = owl_fmtext_line_number(&v->fmtext, linestart);
397        owl_viewwin_dirty(v);
398        return 1;
399      }
400      lineend = linestart;
401    }
402    return 0;
403  }
404}
405
406void owl_viewwin_delete(owl_viewwin *v)
407{
408  if (v->onclose_hook) {
409    v->onclose_hook(v, v->onclose_hook_data);
410    v->onclose_hook = NULL;
411    v->onclose_hook_data = NULL;
412  }
413  owl_viewwin_set_typwin_inactive(v);
414  /* TODO: This is far too tedious. owl_viewwin should own v->window
415   * and just unlink it in one go. Signals should also go away for
416   * free. */
417  g_signal_handler_disconnect(v->window, v->sig_resize_id);
418  g_signal_handler_disconnect(v->content, v->sig_content_redraw_id);
419  g_signal_handler_disconnect(v->status, v->sig_status_redraw_id);
420  owl_window_unlink(v->content);
421  owl_window_unlink(v->status);
422  g_object_unref(v->window);
423  g_object_unref(v->content);
424  g_object_unref(v->status);
425  owl_fmtext_cleanup(&(v->fmtext));
426  g_slice_free(owl_viewwin, v);
427}
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