~exec64/imv

ref: 4c0123bb3b449a2ea45b3e831db725d853bb03a1 imv/src/navigator.c -rw-r--r-- 7.4 KiB
4c0123bb — Harry Jeffery Release v4.0.1 3 years ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
#include "navigator.h"

#include <assert.h>
#include <dirent.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>

#include "list.h"

/* Some systems like GNU/Hurd don't define PATH_MAX */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif

struct nav_item {
  char *path;
};

struct imv_navigator {
  struct list *paths;
  size_t cur_path;
  time_t last_change;
  time_t last_check;
  int last_move_direction;
  int changed;
  int wrapped;
};

struct imv_navigator *imv_navigator_create(void)
{
  struct imv_navigator *nav = calloc(1, sizeof *nav);
  nav->last_move_direction = 1;
  nav->paths = list_create();
  return nav;
}

void imv_navigator_free(struct imv_navigator *nav)
{
  for (size_t i = 0; i < nav->paths->len; ++i) {
    struct nav_item *nav_item = nav->paths->items[i];
    free(nav_item->path);
  }
  list_deep_free(nav->paths);
  free(nav);
}

static int add_item(struct imv_navigator *nav, const char *path)
{
  struct nav_item *nav_item = calloc(1, sizeof *nav_item);

  nav_item->path = realpath(path, NULL);
  if (!nav_item->path) {
    nav_item->path = strdup(path);
  }

  list_append(nav->paths, nav_item);

  if (nav->paths->len == 1) {
    nav->cur_path = 0;
    nav->changed = 1;
  }

  return 0;
}

int imv_navigator_add(struct imv_navigator *nav, const char *path,
                       int recursive)
{
  char path_buf[PATH_MAX+1];
  struct stat path_info;
  if (stat(path, &path_info)) {
    return 1;
  }
  if (S_ISDIR(path_info.st_mode)) {
    int result = 0;
    DIR *d = opendir(path);
    if (d) {
      struct dirent *dir;
      while ((dir = readdir(d)) != NULL) {
        if (strcmp(dir->d_name, "..") == 0 || strcmp(dir->d_name, ".") == 0) {
          continue;
        }
        snprintf(path_buf, sizeof path_buf, "%s/%s", path, dir->d_name);
        struct stat new_path_info;
        if (stat(path_buf, &new_path_info)) {
          result = 1;
          break;
        }
        int is_dir = S_ISDIR(new_path_info.st_mode);
        if (is_dir && recursive) {
          if (imv_navigator_add(nav, path_buf, recursive) != 0) {
            result = 1;
            break;
          }
        } else if (!is_dir) {
          if (add_item(nav, path_buf) != 0) {
            result = 1;
            break;
          }
        }
      }
      closedir(d);
    }
    return result;
  } else {
    return add_item(nav, path);
  }

  return 0;
}

const char *imv_navigator_selection(struct imv_navigator *nav)
{
  const char *path = imv_navigator_at(nav, nav->cur_path);
  return path ? path : "";
}

size_t imv_navigator_index(struct imv_navigator *nav)
{
  return nav->cur_path;
}

void imv_navigator_select_rel(struct imv_navigator *nav, ssize_t direction)
{
  const ssize_t prev_path = nav->cur_path;
  if (nav->paths->len == 0) {
    return;
  }

  if (direction > 1) {
    direction = direction % nav->paths->len;
  } else if (direction < -1) {
    direction = direction % nav->paths->len;
  } else if (direction == 0) {
    return;
  }

  ssize_t new_path = nav->cur_path + direction;
  if (new_path >= (ssize_t)nav->paths->len) {
    /* Wrap after the end of the list */
    new_path -= (ssize_t)nav->paths->len;
    nav->wrapped = 1;
  } else if (new_path < 0) {
    /* Wrap before the start of the list */
    new_path += (ssize_t)nav->paths->len;
    nav->wrapped = 1;
  }
  nav->cur_path = (size_t)new_path;
  nav->last_move_direction = direction;
  nav->changed = prev_path != new_path;
  return;
}

void imv_navigator_select_abs(struct imv_navigator *nav, ssize_t index)
{
  /* allow -1 to indicate the last image */
  if (index < 0) {
    index += (ssize_t)nav->paths->len;

    /* but if they go farther back than the first image, stick to first image */
    if (index < 0) {
      index = 0;
    }
  }

  /* stick to last image if we go beyond it */
  if (index >= (ssize_t)nav->paths->len) {
    index = (ssize_t)nav->paths->len - 1;
  }

  const size_t prev_path = nav->cur_path;
  nav->cur_path = (size_t)index;
  nav->changed = prev_path != nav->cur_path;
  nav->last_move_direction = (index >= (ssize_t)prev_path) ? 1 : -1;
}

void imv_navigator_remove(struct imv_navigator *nav, const char *path)
{
  bool found = false;
  size_t removed = 0;
  for (size_t i = 0; i < nav->paths->len; ++i) {
    struct nav_item *item = nav->paths->items[i];
    if (!strcmp(item->path, path)) {
      free(item->path);
      free(item);
      list_remove(nav->paths, i);
      removed = i;
      found = true;
      break;
    }
  }

  if (!found) {
    return;
  }

  if (nav->cur_path == removed) {
    /* We just removed the current path */
    if (nav->last_move_direction < 0) {
      /* Move left */
      imv_navigator_select_rel(nav, -1);
    } else {
      /* Try to stay where we are, unless we ran out of room */
      if (nav->cur_path == nav->paths->len) {
        nav->cur_path = 0;
        nav->wrapped = 1;
      }
    }
  }
  nav->changed = 1;
}

void imv_navigator_remove_at(struct imv_navigator *nav, size_t index)
{
  if (index >= nav->paths->len) {
    return;
  }
  struct nav_item *item = nav->paths->items[index];
  free(item->path);
  free(item);
  list_remove(nav->paths, index);

  if (nav->cur_path == index) {
    /* We just removed the current path */
    if (nav->last_move_direction < 0) {
      /* Move left */
      imv_navigator_select_rel(nav, -1);
    } else {
      /* Try to stay where we are, unless we ran out of room */
      if (nav->cur_path == nav->paths->len) {
        nav->cur_path = 0;
        nav->wrapped = 1;
      }
    }
  }
  nav->changed = 1;
}

void imv_navigator_remove_all(struct imv_navigator *nav)
{
  for (size_t i = 0; i < nav->paths->len; ++i) {
    struct nav_item *item = nav->paths->items[i];
    free(item->path);
    free(item);
  }
  list_clear(nav->paths);
  nav->cur_path = 0;
  nav->changed = 1;
}

ssize_t imv_navigator_find_path(struct imv_navigator *nav, const char *path)
{
  /* first try to match the exact path */
  for (size_t i = 0; i < nav->paths->len; ++i) {
    struct nav_item *item = nav->paths->items[i];
    if (!strcmp(item->path, path)) {
      return (ssize_t)i;
    }
  }

  /* no exact matches, try the final portion of the path */
  for (size_t i = 0; i < nav->paths->len; ++i) {
    struct nav_item *item = nav->paths->items[i];
    char *last_sep = strrchr(item->path, '/');
    if (last_sep && !strcmp(last_sep+1, path)) {
      return (ssize_t)i;
    }
  }

  /* no matches at all, give up */
  return -1;
}

int imv_navigator_poll_changed(struct imv_navigator *nav)
{
  if (nav->changed) {
    nav->changed = 0;
    nav->last_change = time(NULL);
    return 1;
  }

  if (nav->paths->len == 0) {
    return 0;
  };

  time_t cur_time = time(NULL);
  /* limit polling to once per second */
  if (nav->last_check < cur_time - 1) {
    nav->last_check = cur_time;

    struct stat file_info;
    struct nav_item *cur_item = nav->paths->items[nav->cur_path];
    if (stat(cur_item->path, &file_info) == -1) {
      return 0;
    }

    time_t file_changed = file_info.st_mtim.tv_sec;
    if (file_changed > nav->last_change) {
      nav->last_change = file_changed;
      return 1;
    }
  }
  return 0;
}

int imv_navigator_wrapped(struct imv_navigator *nav)
{
  return nav->wrapped;
}

size_t imv_navigator_length(struct imv_navigator *nav)
{
  return nav->paths->len;
}

char *imv_navigator_at(struct imv_navigator *nav, size_t index)
{
  if (index < nav->paths->len) {
    struct nav_item *item = nav->paths->items[index];
    return item->path;
  }
  return NULL;
}

/* vim:set ts=2 sts=2 sw=2 et: */