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 /** max size allocated for a line */
44 static const size_t wrln_max_line_size = 1024;
46 /** max items stored in the history list */
47 static const guint wrln_max_history_length = 32;
49 void *wrln_completion_callback_data = NULL;
50 wrln_gcmp_pre_cb_t wrln_pre_completion_callback = NULL;
51 wrln_gcmp_post_cb_t wrln_post_completion_callback = NULL;
53 /* move the cursor one step to the right */
54 static inline void cursor_move_right(gint *cursor,
55 gint *start,
56 gint width,
57 gint x0,
58 gint x1,
59 gchar *line)
60 {
61 if (*cursor < (int)strlen(line) &&
62 *cursor < (int)wrln_max_line_size - 1) {
63 (*cursor)++;
64 if (*cursor + x0 >= x1 && *start < *cursor - width + 1)
65 (*start)++;
66 }
67 }
69 /* move the cursor one step to the left */
70 static inline void cursor_move_left(gint *cursor,
71 gint *start)
72 {
73 if (*cursor > 0) {
74 if (*cursor == *start && *start > 0)
75 (*start)--;
76 (*cursor)--;
77 }
78 }
80 /* move the cursor to the end of the line */
81 static inline void cursor_move_to_eol(gint *cursor,
82 gint *start,
83 gint width,
84 gint x0,
85 gint x1,
86 gchar *line)
87 {
88 *cursor = strlen(line);
89 if (*cursor + x0 >= x1)
90 *start = *cursor - width + 1;
91 }
93 /* draw line buffer and update cursor position */
94 static inline void drawline(gint cursor,
95 gint start,
96 gint width,
97 gint x0,
98 gint y,
99 gboolean masked,
100 gchar *line,
101 WINDOW *w)
102 {
103 wmove(w, y, x0);
104 /* clear input area */
105 whline(w, ' ', width);
106 /* print visible part of the line buffer */
107 if(masked == TRUE)
108 whline(w, '*', utf8_width(line) - start);
109 else
110 waddnstr(w, line+start, width);
111 /* move the cursor to the correct position */
112 wmove(w, y, x0 + cursor-start);
113 /* tell ncurses to redraw the screen */
114 doupdate();
115 }
117 /* libcurses version */
119 static gchar *
120 _wreadln(WINDOW *w,
121 const gchar *prompt,
122 const gchar *initial_value,
123 gint x1,
124 GList **history,
125 GCompletion *gcmp,
126 gboolean masked)
127 {
128 GList *hlist = NULL, *hcurrent = NULL;
129 gchar *line;
130 gint x0, y, width;
131 gint cursor = 0, start = 0;
132 gint key = 0, i;
134 /* allocate a line buffer */
135 line = g_malloc0(wrln_max_line_size);
136 /* turn off echo */
137 noecho();
138 /* make shure the cursor is visible */
139 curs_set(1);
140 /* print prompt string */
141 if (prompt)
142 waddstr(w, prompt);
143 /* retrive y and x0 position */
144 getyx(w, y, x0);
145 /* check the x1 value */
146 if (x1 <= x0 || x1 > COLS)
147 x1 = COLS;
148 width = x1 - x0;
149 /* clear input area */
150 mvwhline(w, y, x0, ' ', width);
152 if (history) {
153 /* append the a new line to our history list */
154 *history = g_list_append(*history, g_malloc0(wrln_max_line_size));
155 /* hlist points to the current item in the history list */
156 hlist = g_list_last(*history);
157 hcurrent = hlist;
158 }
160 if (initial_value == (char *)-1) {
161 /* get previous history entry */
162 if (history && hlist->prev) {
163 if (hlist == hcurrent)
164 /* save the current line */
165 g_strlcpy(hlist->data, line, wrln_max_line_size);
167 /* get previous line */
168 hlist = hlist->prev;
169 g_strlcpy(line, hlist->data, wrln_max_line_size);
170 }
171 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
172 drawline(cursor, start, width, x0, y, masked, line, w);
173 } else if (initial_value) {
174 /* copy the initial value to the line buffer */
175 g_strlcpy(line, initial_value, wrln_max_line_size);
176 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
177 drawline(cursor, start, width, x0, y, masked, line, w);
178 }
180 while (key != 13 && key != '\n') {
181 key = wgetch(w);
183 /* check if key is a function key */
184 for (i = 0; i < 63; i++)
185 if (key == KEY_F(i)) {
186 key = KEY_F(1);
187 i = 64;
188 }
190 switch (key) {
191 #ifdef HAVE_GETMOUSE
192 case KEY_MOUSE: /* ignore mouse events */
193 #endif
194 case ERR: /* ingnore errors */
195 break;
197 case TAB:
198 if (gcmp) {
199 char *prefix = NULL;
200 GList *list;
202 if (wrln_pre_completion_callback)
203 wrln_pre_completion_callback(gcmp, line,
204 wrln_completion_callback_data);
205 list = g_completion_complete(gcmp, line, &prefix);
206 if (prefix) {
207 g_strlcpy(line, prefix, wrln_max_line_size);
208 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
209 g_free(prefix);
210 } else
211 screen_bell();
213 if (wrln_post_completion_callback)
214 wrln_post_completion_callback(gcmp, line, list,
215 wrln_completion_callback_data);
216 }
217 break;
219 case KEY_CTRL_G:
220 screen_bell();
221 g_free(line);
222 if (history) {
223 g_free(hcurrent->data);
224 hcurrent->data = NULL;
225 *history = g_list_delete_link(*history, hcurrent);
226 }
227 return NULL;
229 case KEY_LEFT:
230 case KEY_CTRL_B:
231 cursor_move_left(&cursor, &start);
232 break;
233 case KEY_RIGHT:
234 case KEY_CTRL_F:
235 cursor_move_right(&cursor, &start, width, x0, x1, line);
236 break;
237 case KEY_HOME:
238 case KEY_CTRL_A:
239 cursor = 0;
240 start = 0;
241 break;
242 case KEY_END:
243 case KEY_CTRL_E:
244 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
245 break;
246 case KEY_CTRL_K:
247 line[cursor] = 0;
248 break;
249 case KEY_CTRL_U:
250 cursor = utf8_width(line);
251 for (i = 0;i < cursor; i++)
252 line[i] = '\0';
253 cursor = 0;
254 break;
255 case 127:
256 case KEY_BCKSPC: /* handle backspace: copy all */
257 case KEY_BACKSPACE: /* chars starting from curpos */
258 if( cursor > 0 ) {/* - 1 from buf[n+1] to buf */
259 for (i = cursor - 1; line[i] != 0; i++)
260 line[i] = line[i + 1];
261 cursor_move_left(&cursor, &start);
262 }
263 break;
264 case KEY_DC: /* handle delete key. As above */
265 case KEY_CTRL_D:
266 if (cursor <= (gint)utf8_width(line) - 1) {
267 for (i = cursor; line[i] != 0; i++)
268 line[i] = line[i + 1];
269 }
270 break;
271 case KEY_UP:
272 case KEY_CTRL_P:
273 /* get previous history entry */
274 if (history && hlist->prev) {
275 if (hlist == hcurrent)
276 /* save the current line */
277 g_strlcpy(hlist->data, line, wrln_max_line_size);
279 /* get previous line */
280 hlist = hlist->prev;
281 g_strlcpy(line, hlist->data, wrln_max_line_size);
282 }
283 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
284 break;
285 case KEY_DOWN:
286 case KEY_CTRL_N:
287 /* get next history entry */
288 if (history && hlist->next) {
289 /* get next line */
290 hlist = hlist->next;
291 g_strlcpy(line, hlist->data, wrln_max_line_size);
292 }
293 cursor_move_to_eol(&cursor, &start, width, x0, x1, line);
294 break;
296 case '\n':
297 case 13:
298 case KEY_IC:
299 case KEY_PPAGE:
300 case KEY_NPAGE:
301 case KEY_F(1):
302 /* ignore char */
303 break;
304 default:
305 if (key >= 32) {
306 if (strlen (line + cursor)) { /* if the cursor is */
307 /* not at the last pos */
308 gchar *tmp = NULL;
309 gsize size = strlen(line + cursor) + 1;
311 tmp = g_malloc0(size);
312 g_strlcpy (tmp, line + cursor, size);
313 line[cursor] = key;
314 line[cursor + 1] = 0;
315 g_strlcat (&line[cursor + 1], tmp, size);
316 g_free(tmp);
317 cursor_move_right(&cursor, &start, width, x0, x1, line);
318 } else {
319 line[cursor + 1] = 0;
320 line[cursor] = key;
321 cursor_move_right(&cursor, &start, width, x0, x1, line);
322 }
323 }
324 }
326 drawline(cursor, start, width, x0, y, masked, line, w);
327 }
329 /* update history */
330 if (history) {
331 if (strlen(line)) {
332 /* update the current history entry */
333 size_t size = strlen(line)+1;
334 hcurrent->data = g_realloc(hcurrent->data, size);
335 g_strlcpy(hcurrent->data, line, size);
336 } else {
337 /* the line was empty - remove the current history entry */
338 g_free(hcurrent->data);
339 hcurrent->data = NULL;
340 *history = g_list_delete_link(*history, hcurrent);
341 }
343 while (g_list_length(*history) > wrln_max_history_length) {
344 GList *first = g_list_first(*history);
346 /* remove the oldest history entry */
347 g_free(first->data);
348 first->data = NULL;
349 *history = g_list_delete_link(*history, first);
350 }
351 }
353 return g_realloc(line, strlen(line)+1);
354 }
356 gchar *
357 wreadln(WINDOW *w,
358 const gchar *prompt,
359 const gchar *initial_value,
360 gint x1,
361 GList **history,
362 GCompletion *gcmp)
363 {
364 return _wreadln(w, prompt, initial_value, x1, history, gcmp, FALSE);
365 }
367 gchar *
368 wreadln_masked(WINDOW *w,
369 const gchar *prompt,
370 const gchar *initial_value,
371 gint x1,
372 GList **history,
373 GCompletion *gcmp)
374 {
375 return _wreadln(w, prompt, initial_value, x1, history, gcmp, TRUE);
376 }