b5caef7dd6ef72a636ecadbb89640f2ba2147f9f
1 /*
2 * $Id$
3 *
4 * (c) 2004 by Kalle Wallin <kaw@linux.se>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
21 #include <stdlib.h>
22 #include <string.h>
23 #include <ncurses.h>
24 #include <glib.h>
26 #include "wreadln.h"
28 #define KEY_CTRL_A 1
29 #define KEY_CTRL_D 4
30 #define KEY_CTRL_E 5
31 #define KEY_CTRL_G 7
32 #define KEY_CTRL_K 11
33 #define KEY_BCKSPC 8
34 #define TAB 9
36 #define WRLN_MAX_LINE_SIZE 1024
37 #define WRLN_MAX_HISTORY_LENGTH 32
39 unsigned int wrln_max_line_size = WRLN_MAX_LINE_SIZE;
40 unsigned int wrln_max_history_length = WRLN_MAX_HISTORY_LENGTH;
41 GVoidFunc wrln_resize_callback = NULL;
42 wrln_gcmp_pre_cb_t wrln_pre_completion_callback = NULL;
43 wrln_gcmp_post_cb_t wrln_post_completion_callback = NULL;
46 char *
47 wreadln(WINDOW *w,
48 char *prompt,
49 char *initial_value,
50 int x1,
51 GList **history,
52 GCompletion *gcmp)
53 {
54 GList *hlist = NULL, *hcurrent = NULL;
55 char *line;
56 int x0, y, width;
57 int cursor = 0, start = 0;
58 int key = 0, i;
60 /* move the cursor one step to the right */
61 void cursor_move_right(void) {
62 if( cursor < strlen(line) && cursor<wrln_max_line_size-1 )
63 {
64 cursor++;
65 if( cursor+x0 >= x1 && start<cursor-width+1)
66 start++;
67 }
68 }
69 /* move the cursor one step to the left */
70 void cursor_move_left(void) {
71 if( cursor > 0 )
72 {
73 if( cursor==start && start > 0 )
74 start--;
75 cursor--;
76 }
77 }
78 /* move the cursor to the end of the line */
79 void cursor_move_to_eol(void) {
80 cursor = strlen(line);
81 if( cursor+x0 >= x1 )
82 start = cursor-width+1;
83 }
84 /* draw line buffer and update cursor position */
85 void drawline() {
86 wmove(w, y, x0);
87 /* clear input area */
88 whline(w, ' ', width);
89 /* print visible part of the line buffer */
90 waddnstr(w, line+start, width);
91 /* move the cursor to the correct position */
92 wmove(w, y, x0 + cursor-start);
93 /* tell ncurses to redraw the screen */
94 doupdate();
95 }
98 /* allocate a line buffer */
99 line = g_malloc0(wrln_max_line_size);
100 /* turn off echo */
101 noecho();
102 /* make shure the cursor is visible */
103 curs_set(1);
104 /* print prompt string */
105 if( prompt )
106 waddstr(w, prompt);
107 /* retrive y and x0 position */
108 getyx(w, y, x0);
109 /* check the x1 value */
110 if( x1<=x0 || x1>COLS )
111 x1 = COLS;
112 width = x1-x0;
113 /* clear input area */
114 mvwhline(w, y, x0, ' ', width);
116 if( history )
117 {
118 /* append the a new line to our history list */
119 *history = g_list_append(*history, g_malloc0(wrln_max_line_size));
120 /* hlist points to the current item in the history list */
121 hlist = g_list_last(*history);
122 hcurrent = hlist;
123 }
125 if( initial_value == (char *) -1 )
126 {
127 /* get previous history entry */
128 if( history && hlist->prev )
129 {
130 if( hlist==hcurrent )
131 {
132 /* save the current line */
133 strncpy(hlist->data, line, wrln_max_line_size);
134 }
135 /* get previous line */
136 hlist = hlist->prev;
137 strncpy(line, hlist->data, wrln_max_line_size);
138 }
139 cursor_move_to_eol();
140 drawline();
141 }
142 else if( initial_value )
143 {
144 /* copy the initial value to the line buffer */
145 strncpy(line, initial_value, wrln_max_line_size);
146 cursor_move_to_eol();
147 drawline();
148 }
150 while( key!=13 && key!='\n' )
151 {
152 key = wgetch(w);
154 /* check if key is a function key */
155 for(i=0; i<63; i++)
156 if( key==KEY_F(i) )
157 {
158 key=KEY_F(1);
159 i=64;
160 }
162 switch (key)
163 {
164 case ERR:
165 /* ingnore errors */
166 break;
168 case KEY_RESIZE:
169 /* a resize event -> call an external callback function */
170 if( wrln_resize_callback )
171 wrln_resize_callback();
172 if( x1>COLS )
173 {
174 x1=COLS;
175 width = x1-x0;
176 cursor_move_to_eol();
177 }
178 /* make shure the cursor is visible */
179 curs_set(1);
180 break;
182 case TAB:
183 if( gcmp && strlen(line))
184 {
185 char *prefix = NULL;
186 GList *list;
188 if(wrln_pre_completion_callback)
189 wrln_pre_completion_callback(gcmp, line);
190 list = g_completion_complete(gcmp, line, &prefix);
191 if( prefix )
192 {
193 int len = strlen(prefix);
194 strncpy(line, prefix, len);
195 cursor_move_to_eol();
196 g_free(prefix);
197 }
198 else
199 beep();
200 if( wrln_post_completion_callback )
201 wrln_post_completion_callback(gcmp, line, list);
202 }
203 break;
205 case KEY_CTRL_G:
206 beep();
207 g_free(line);
208 if( history )
209 {
210 g_free(hcurrent->data);
211 hcurrent->data = NULL;
212 *history = g_list_delete_link(*history, hcurrent);
213 }
214 return NULL;
216 case KEY_LEFT:
217 cursor_move_left();
218 break;
219 case KEY_RIGHT:
220 cursor_move_right();
221 break;
222 case KEY_HOME:
223 case KEY_CTRL_A:
224 cursor = 0;
225 start = 0;
226 break;
227 case KEY_END:
228 case KEY_CTRL_E:
229 cursor_move_to_eol();
230 break;
231 case KEY_CTRL_K:
232 line[cursor] = 0;
233 break;
234 case 127:
235 case KEY_BCKSPC: /* handle backspace: copy all */
236 case KEY_BACKSPACE: /* chars starting from curpos */
237 if( cursor > 0 ) /* - 1 from buf[n+1] to buf */
238 {
239 for (i = cursor - 1; line[i] != 0; i++)
240 line[i] = line[i + 1];
241 cursor_move_left();
242 }
243 break;
244 case KEY_DC: /* handle delete key. As above */
245 case KEY_CTRL_D:
246 if( cursor <= strlen(line) - 1 )
247 {
248 for (i = cursor; line[i] != 0; i++)
249 line[i] = line[i + 1];
250 }
251 break;
252 case KEY_UP:
253 /* get previous history entry */
254 if( history && hlist->prev )
255 {
256 if( hlist==hcurrent )
257 {
258 /* save the current line */
259 strncpy(hlist->data, line, wrln_max_line_size);
260 }
261 /* get previous line */
262 hlist = hlist->prev;
263 strncpy(line, hlist->data, wrln_max_line_size);
264 }
265 // if (cursor > strlen(line))
266 cursor_move_to_eol();
267 break;
268 case KEY_DOWN:
269 /* get next history entry */
270 if( history && hlist->next )
271 {
272 /* get next line */
273 hlist = hlist->next;
274 strncpy(line, hlist->data, wrln_max_line_size);
275 }
276 cursor_move_to_eol();
277 break;
279 case '\n':
280 case 13:
281 case KEY_IC:
282 case KEY_PPAGE:
283 case KEY_NPAGE:
284 case KEY_F(1):
285 /* ignore char */
286 break;
287 default:
288 if (key >= 32)
289 {
290 if (strlen (line + cursor)) /* if the cursor is */
291 { /* not at the last pos */
292 char *tmp = 0;
293 tmp = g_malloc0(strlen (line + cursor) + 1);
294 strcpy (tmp, line + cursor);
295 line[cursor] = key;
296 line[cursor + 1] = 0;
297 strcat (&line[cursor + 1], tmp);
298 g_free(tmp);
299 cursor_move_right();
300 }
301 else
302 {
303 line[cursor + 1] = 0;
304 line[cursor] = key;
305 cursor_move_right();
306 }
307 }
308 }
310 drawline();
311 }
313 /* update history */
314 if( history )
315 {
316 if( strlen(line) )
317 {
318 /* update the current history entry */
319 size_t size = strlen(line)+1;
320 hcurrent->data = g_realloc(hcurrent->data, size);
321 strncpy(hcurrent->data, line, size);
322 }
323 else
324 {
325 /* the line was empty - remove the current history entry */
326 g_free(hcurrent->data);
327 hcurrent->data = NULL;
328 *history = g_list_delete_link(*history, hcurrent);
329 }
331 while( g_list_length(*history) > wrln_max_history_length )
332 {
333 GList *first = g_list_first(*history);
335 /* remove the oldest history entry */
336 g_free(first->data);
337 first->data = NULL;
338 *history = g_list_delete_link(*history, first);
339 }
340 }
342 return g_realloc(line, strlen(line)+1);
343 }