Code

wreadln: import screen_bell() from screen_utils.h
[ncmpc.git] / src / wreadln.c
1 /*
2  * (c) 2004 by Kalle Wallin <kaw@linux.se>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16  *
17  */
19 #include "wreadln.h"
20 #include "charset.h"
21 #include "screen_utils.h"
22 #include "config.h"
24 #include <stdlib.h>
25 #include <string.h>
26 #include <glib.h>
28 #define KEY_CTRL_A   1
29 #define KEY_CTRL_B   2
30 #define KEY_CTRL_C   3
31 #define KEY_CTRL_D   4
32 #define KEY_CTRL_E   5
33 #define KEY_CTRL_F   6
34 #define KEY_CTRL_G   7
35 #define KEY_CTRL_K   11
36 #define KEY_CTRL_N   14
37 #define KEY_CTRL_P   16
38 #define KEY_CTRL_U   21
39 #define KEY_CTRL_Z   26
40 #define KEY_BCKSPC   8
41 #define TAB          9
43 #define WRLN_MAX_LINE_SIZE 1024
44 #define WRLN_MAX_HISTORY_LENGTH 32
45  
46 guint wrln_max_line_size = WRLN_MAX_LINE_SIZE;
47 guint wrln_max_history_length = WRLN_MAX_HISTORY_LENGTH;
48 void *wrln_completion_callback_data = NULL;
49 wrln_gcmp_pre_cb_t wrln_pre_completion_callback = NULL;
50 wrln_gcmp_post_cb_t wrln_post_completion_callback = NULL;
52 /* move the cursor one step to the right */
53 static inline void cursor_move_right(gint *cursor,
54                                      gint *start,
55                                      gint width,
56                                      gint x0,
57                                      gint x1,
58                                      gchar *line)
59 {
60         if (*cursor < (int)strlen(line) &&
61             *cursor < (int)wrln_max_line_size - 1) {
62                 (*cursor)++;
63                 if (*cursor + x0 >= x1 && *start < *cursor - width + 1)
64                         (*start)++;
65         }
66 }
68 /* move the cursor one step to the left */
69 static inline void cursor_move_left(gint *cursor,
70                                     gint *start)
71 {
72         if (*cursor > 0) {
73                 if (*cursor == *start && *start > 0)
74                         (*start)--;
75                 (*cursor)--;
76         }
77 }
79 /* move the cursor to the end of the line */
80 static inline void cursor_move_to_eol(gint *cursor,
81                                       gint *start,
82                                       gint width,
83                                       gint x0,
84                                       gint x1,
85                                       gchar *line)
86 {
87         *cursor = strlen(line);
88         if (*cursor + x0 >= x1)
89                 *start = *cursor - width + 1;
90 }
92 /* draw line buffer and update cursor position */
93 static inline void drawline(gint cursor,
94                             gint start,
95                             gint width,
96                             gint x0,
97                             gint y,
98                             gboolean masked,
99                             gchar *line,
100                             WINDOW *w)
102         wmove(w, y, x0);
103         /* clear input area */
104         whline(w, ' ', width);
105         /* print visible part of the line buffer */
106         if(masked == TRUE)
107                 whline(w, '*', utf8_width(line) - start);
108         else
109                 waddnstr(w, line+start, width);
110         /* move the cursor to the correct position */
111         wmove(w, y, x0 + cursor-start);
112         /* tell ncurses to redraw the screen */
113         doupdate();
116 /* libcurses version */
118 static gchar *
119 _wreadln(WINDOW *w,
120          const gchar *prompt,
121          const gchar *initial_value,
122          gint x1,
123          GList **history,
124          GCompletion *gcmp,
125          gboolean masked)
127         GList *hlist = NULL, *hcurrent = NULL;
128         gchar *line;
129         gint x0, y, width;
130         gint cursor = 0, start = 0;
131         gint key = 0, i;
133         /* allocate a line buffer */
134         line = g_malloc0(wrln_max_line_size);
135         /* turn off echo */
136         noecho();
137         /* make shure the cursor is visible */
138         curs_set(1);
139         /* print prompt string */
140         if (prompt)
141                 waddstr(w, prompt);
142         /* retrive y and x0 position */
143         getyx(w, y, x0);
144         /* check the x1 value */
145         if (x1 <= x0 || x1 > COLS)
146                 x1 = COLS;
147         width = x1 - x0;
148         /* clear input area */
149         mvwhline(w, y, x0, ' ', width);
151         if (history) {
152                 /* append the a new line to our history list */
153                 *history = g_list_append(*history, g_malloc0(wrln_max_line_size));
154                 /* hlist points to the current item in the history list */
155                 hlist = g_list_last(*history);
156                 hcurrent = hlist;
157         }
159         if (initial_value == (char *)-1) {
160                 /* get previous history entry */
161                 if (history && hlist->prev) {
162                         if (hlist == hcurrent)
163                                 /* save the current line */
164                                 g_strlcpy(hlist->data, line, wrln_max_line_size);
166                         /* get previous line */
167                         hlist = hlist->prev;
168                         g_strlcpy(line, hlist->data, wrln_max_line_size);
169                 }
170                 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
171                 drawline(cursor, start, width, x0, y, masked, line, w);
172         } else if (initial_value) {
173                 /* copy the initial value to the line buffer */
174                 g_strlcpy(line, initial_value, wrln_max_line_size);
175                 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
176                 drawline(cursor, start, width, x0, y, masked, line, w);
177         }
179         while (key != 13 && key != '\n') {
180                 key = wgetch(w);
182                 /* check if key is a function key */
183                 for (i = 0; i < 63; i++)
184                         if (key == KEY_F(i)) {
185                                 key = KEY_F(1);
186                                 i = 64;
187                         }
189                 switch (key) {
190 #ifdef HAVE_GETMOUSE
191                 case KEY_MOUSE: /* ignore mouse events */
192 #endif
193                 case ERR: /* ingnore errors */
194                         break;
196                 case TAB:
197                         if (gcmp) {
198                                 char *prefix = NULL;
199                                 GList *list;
201                                 if (wrln_pre_completion_callback)
202                                         wrln_pre_completion_callback(gcmp, line,
203                                                                      wrln_completion_callback_data);
204                                 list = g_completion_complete(gcmp, line, &prefix);
205                                 if (prefix) {
206                                         g_strlcpy(line, prefix, wrln_max_line_size);
207                                         cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
208                                         g_free(prefix);
209                                 } else
210                                         screen_bell();
212                                 if (wrln_post_completion_callback)
213                                         wrln_post_completion_callback(gcmp, line, list,
214                                                                       wrln_completion_callback_data);
215                         }
216                         break;
218                 case KEY_CTRL_G:
219                         screen_bell();
220                         g_free(line);
221                         if (history) {
222                                 g_free(hcurrent->data);
223                                 hcurrent->data = NULL;
224                                 *history = g_list_delete_link(*history, hcurrent);
225                         }
226                         return NULL;
228                 case KEY_LEFT:
229                 case KEY_CTRL_B:
230                         cursor_move_left(&cursor, &start);
231                         break;
232                 case KEY_RIGHT:
233                 case KEY_CTRL_F:
234                         cursor_move_right(&cursor, &start, width, x0, x1, line);
235                         break;
236                 case KEY_HOME:
237                 case KEY_CTRL_A:
238                         cursor = 0;
239                         start = 0;
240                         break;
241                 case KEY_END:
242                 case KEY_CTRL_E:
243                         cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
244                         break;
245                 case KEY_CTRL_K:
246                         line[cursor] = 0;
247                         break;
248                 case KEY_CTRL_U:
249                         cursor = utf8_width(line);
250                         for (i = 0;i < cursor; i++)
251                                 line[i] = '\0';
252                         cursor = 0;
253                         break;
254                 case 127:
255                 case KEY_BCKSPC:        /* handle backspace: copy all */
256                 case KEY_BACKSPACE:     /* chars starting from curpos */
257                         if( cursor > 0 ) {/* - 1 from buf[n+1] to buf   */
258                                 for (i = cursor - 1; line[i] != 0; i++)
259                                         line[i] = line[i + 1];
260                                 cursor_move_left(&cursor, &start);
261                         }
262                         break;
263                 case KEY_DC:            /* handle delete key. As above */
264                 case KEY_CTRL_D:
265                         if (cursor <= (gint)utf8_width(line) - 1) {
266                                 for (i = cursor; line[i] != 0; i++)
267                                         line[i] = line[i + 1];
268                         }
269                         break;
270                 case KEY_UP:
271                 case KEY_CTRL_P:
272                         /* get previous history entry */
273                         if (history && hlist->prev) {
274                                 if (hlist == hcurrent)
275                                         /* save the current line */
276                                         g_strlcpy(hlist->data, line, wrln_max_line_size);
278                                 /* get previous line */
279                                 hlist = hlist->prev;
280                                 g_strlcpy(line, hlist->data, wrln_max_line_size);
281                         }
282                         cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
283                         break;
284                 case KEY_DOWN:
285                 case KEY_CTRL_N:
286                         /* get next history entry */
287                         if (history && hlist->next) {
288                                 /* get next line */
289                                 hlist = hlist->next;
290                                 g_strlcpy(line, hlist->data, wrln_max_line_size);
291                         }
292                         cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
293                         break;
295                 case '\n':
296                 case 13:
297                 case KEY_IC:
298                 case KEY_PPAGE:
299                 case KEY_NPAGE:
300                 case KEY_F(1):
301                         /* ignore char */
302                         break;
303                 default:
304                         if (key >= 32) {
305                                 if (strlen (line + cursor)) { /* if the cursor is */
306                                         /* not at the last pos */
307                                         gchar *tmp = NULL;
308                                         gsize size = strlen(line + cursor) + 1;
310                                         tmp = g_malloc0(size);
311                                         g_strlcpy (tmp, line + cursor, size);
312                                         line[cursor] = key;
313                                         line[cursor + 1] = 0;
314                                         g_strlcat (&line[cursor + 1], tmp, size);
315                                         g_free(tmp);
316                                         cursor_move_right(&cursor, &start, width, x0, x1, line);
317                                 } else {
318                                         line[cursor + 1] = 0;
319                                         line[cursor] = key;
320                                         cursor_move_right(&cursor, &start, width, x0, x1, line);
321                                 }
322                         }
323                 }
325                 drawline(cursor, start, width, x0, y, masked, line, w);
326         }
328         /* update history */
329         if (history) {
330                 if (strlen(line)) {
331                         /* update the current history entry */
332                         size_t size = strlen(line)+1;
333                         hcurrent->data = g_realloc(hcurrent->data, size);
334                         g_strlcpy(hcurrent->data, line, size);
335                 } else {
336                         /* the line was empty - remove the current history entry */
337                         g_free(hcurrent->data);
338                         hcurrent->data = NULL;
339                         *history = g_list_delete_link(*history, hcurrent);
340                 }
342                 while (g_list_length(*history) > wrln_max_history_length) {
343                         GList *first = g_list_first(*history);
345                         /* remove the oldest history entry  */
346                         g_free(first->data);
347                         first->data = NULL;
348                         *history = g_list_delete_link(*history, first);
349                 }
350         }
352         return g_realloc(line, strlen(line)+1);
355 gchar *
356 wreadln(WINDOW *w,
357         const gchar *prompt,
358         const gchar *initial_value,
359         gint x1,
360         GList **history,
361         GCompletion *gcmp)
363         return  _wreadln(w, prompt, initial_value, x1, history, gcmp, FALSE);
366 gchar *
367 wreadln_masked(WINDOW *w,
368                const gchar *prompt,
369                const gchar *initial_value,
370                gint x1,
371                GList **history,
372                GCompletion *gcmp)
374         return  _wreadln(w, prompt, initial_value, x1, history, gcmp, TRUE);