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 "config.h"
27 #include "wreadln.h"
29 #define KEY_CTRL_A 1
30 #define KEY_CTRL_D 4
31 #define KEY_CTRL_E 5
32 #define KEY_CTRL_G 7
33 #define KEY_CTRL_K 11
34 #define KEY_BCKSPC 8
35 #define TAB 9
37 #define WRLN_MAX_LINE_SIZE 1024
38 #define WRLN_MAX_HISTORY_LENGTH 32
40 unsigned int wrln_max_line_size = WRLN_MAX_LINE_SIZE;
41 unsigned int wrln_max_history_length = WRLN_MAX_HISTORY_LENGTH;
42 GVoidFunc wrln_resize_callback = NULL;
43 wrln_gcmp_pre_cb_t wrln_pre_completion_callback = NULL;
44 wrln_gcmp_post_cb_t wrln_post_completion_callback = NULL;
46 extern void screen_bell(void);
48 char *
49 wreadln(WINDOW *w,
50 char *prompt,
51 char *initial_value,
52 int x1,
53 GList **history,
54 GCompletion *gcmp)
55 {
56 GList *hlist = NULL, *hcurrent = NULL;
57 char *line;
58 int x0, y, width;
59 int cursor = 0, start = 0;
60 int key = 0, i;
62 /* move the cursor one step to the right */
63 void cursor_move_right(void) {
64 if( cursor < strlen(line) && cursor<wrln_max_line_size-1 )
65 {
66 cursor++;
67 if( cursor+x0 >= x1 && start<cursor-width+1)
68 start++;
69 }
70 }
71 /* move the cursor one step to the left */
72 void cursor_move_left(void) {
73 if( cursor > 0 )
74 {
75 if( cursor==start && start > 0 )
76 start--;
77 cursor--;
78 }
79 }
80 /* move the cursor to the end of the line */
81 void cursor_move_to_eol(void) {
82 cursor = strlen(line);
83 if( cursor+x0 >= x1 )
84 start = cursor-width+1;
85 }
86 /* draw line buffer and update cursor position */
87 void drawline() {
88 wmove(w, y, x0);
89 /* clear input area */
90 whline(w, ' ', width);
91 /* print visible part of the line buffer */
92 waddnstr(w, line+start, width);
93 /* move the cursor to the correct position */
94 wmove(w, y, x0 + cursor-start);
95 /* tell ncurses to redraw the screen */
96 doupdate();
97 }
100 /* allocate a line buffer */
101 line = g_malloc0(wrln_max_line_size);
102 /* turn off echo */
103 noecho();
104 /* make shure the cursor is visible */
105 curs_set(1);
106 /* print prompt string */
107 if( prompt )
108 waddstr(w, prompt);
109 /* retrive y and x0 position */
110 getyx(w, y, x0);
111 /* check the x1 value */
112 if( x1<=x0 || x1>COLS )
113 x1 = COLS;
114 width = x1-x0;
115 /* clear input area */
116 mvwhline(w, y, x0, ' ', width);
118 if( history )
119 {
120 /* append the a new line to our history list */
121 *history = g_list_append(*history, g_malloc0(wrln_max_line_size));
122 /* hlist points to the current item in the history list */
123 hlist = g_list_last(*history);
124 hcurrent = hlist;
125 }
127 if( initial_value == (char *) -1 )
128 {
129 /* get previous history entry */
130 if( history && hlist->prev )
131 {
132 if( hlist==hcurrent )
133 {
134 /* save the current line */
135 strncpy(hlist->data, line, wrln_max_line_size);
136 }
137 /* get previous line */
138 hlist = hlist->prev;
139 strncpy(line, hlist->data, wrln_max_line_size);
140 }
141 cursor_move_to_eol();
142 drawline();
143 }
144 else if( initial_value )
145 {
146 /* copy the initial value to the line buffer */
147 strncpy(line, initial_value, wrln_max_line_size);
148 cursor_move_to_eol();
149 drawline();
150 }
152 while( key!=13 && key!='\n' )
153 {
154 key = wgetch(w);
156 /* check if key is a function key */
157 for(i=0; i<63; i++)
158 if( key==KEY_F(i) )
159 {
160 key=KEY_F(1);
161 i=64;
162 }
164 switch (key)
165 {
166 #ifdef HAVE_GETMOUSE
167 case KEY_MOUSE: /* ignore mouse events */
168 #endif
169 case ERR: /* ingnore errors */
170 break;
172 case KEY_RESIZE:
173 /* a resize event -> call an external callback function */
174 if( wrln_resize_callback )
175 wrln_resize_callback();
176 if( x1>COLS )
177 {
178 x1=COLS;
179 width = x1-x0;
180 cursor_move_to_eol();
181 }
182 /* make shure the cursor is visible */
183 curs_set(1);
184 break;
186 case TAB:
187 if( gcmp )
188 {
189 char *prefix = NULL;
190 GList *list;
192 if(wrln_pre_completion_callback)
193 wrln_pre_completion_callback(gcmp, line);
194 list = g_completion_complete(gcmp, line, &prefix);
195 if( prefix )
196 {
197 int len = strlen(prefix);
198 strncpy(line, prefix, len);
199 cursor_move_to_eol();
200 g_free(prefix);
201 }
202 else
203 screen_bell();
204 if( wrln_post_completion_callback )
205 wrln_post_completion_callback(gcmp, line, list);
206 }
207 break;
209 case KEY_CTRL_G:
210 screen_bell();
211 g_free(line);
212 if( history )
213 {
214 g_free(hcurrent->data);
215 hcurrent->data = NULL;
216 *history = g_list_delete_link(*history, hcurrent);
217 }
218 return NULL;
220 case KEY_LEFT:
221 cursor_move_left();
222 break;
223 case KEY_RIGHT:
224 cursor_move_right();
225 break;
226 case KEY_HOME:
227 case KEY_CTRL_A:
228 cursor = 0;
229 start = 0;
230 break;
231 case KEY_END:
232 case KEY_CTRL_E:
233 cursor_move_to_eol();
234 break;
235 case KEY_CTRL_K:
236 line[cursor] = 0;
237 break;
238 case 127:
239 case KEY_BCKSPC: /* handle backspace: copy all */
240 case KEY_BACKSPACE: /* chars starting from curpos */
241 if( cursor > 0 ) /* - 1 from buf[n+1] to buf */
242 {
243 for (i = cursor - 1; line[i] != 0; i++)
244 line[i] = line[i + 1];
245 cursor_move_left();
246 }
247 break;
248 case KEY_DC: /* handle delete key. As above */
249 case KEY_CTRL_D:
250 if( cursor <= strlen(line) - 1 )
251 {
252 for (i = cursor; line[i] != 0; i++)
253 line[i] = line[i + 1];
254 }
255 break;
256 case KEY_UP:
257 /* get previous history entry */
258 if( history && hlist->prev )
259 {
260 if( hlist==hcurrent )
261 {
262 /* save the current line */
263 strncpy(hlist->data, line, wrln_max_line_size);
264 }
265 /* get previous line */
266 hlist = hlist->prev;
267 strncpy(line, hlist->data, wrln_max_line_size);
268 }
269 // if (cursor > strlen(line))
270 cursor_move_to_eol();
271 break;
272 case KEY_DOWN:
273 /* get next history entry */
274 if( history && hlist->next )
275 {
276 /* get next line */
277 hlist = hlist->next;
278 strncpy(line, hlist->data, wrln_max_line_size);
279 }
280 cursor_move_to_eol();
281 break;
283 case '\n':
284 case 13:
285 case KEY_IC:
286 case KEY_PPAGE:
287 case KEY_NPAGE:
288 case KEY_F(1):
289 /* ignore char */
290 break;
291 default:
292 if (key >= 32)
293 {
294 if (strlen (line + cursor)) /* if the cursor is */
295 { /* not at the last pos */
296 char *tmp = 0;
297 tmp = g_malloc0(strlen (line + cursor) + 1);
298 strcpy (tmp, line + cursor);
299 line[cursor] = key;
300 line[cursor + 1] = 0;
301 strcat (&line[cursor + 1], tmp);
302 g_free(tmp);
303 cursor_move_right();
304 }
305 else
306 {
307 line[cursor + 1] = 0;
308 line[cursor] = key;
309 cursor_move_right();
310 }
311 }
312 }
314 drawline();
315 }
317 /* update history */
318 if( history )
319 {
320 if( strlen(line) )
321 {
322 /* update the current history entry */
323 size_t size = strlen(line)+1;
324 hcurrent->data = g_realloc(hcurrent->data, size);
325 strncpy(hcurrent->data, line, size);
326 }
327 else
328 {
329 /* the line was empty - remove the current history entry */
330 g_free(hcurrent->data);
331 hcurrent->data = NULL;
332 *history = g_list_delete_link(*history, hcurrent);
333 }
335 while( g_list_length(*history) > wrln_max_history_length )
336 {
337 GList *first = g_list_first(*history);
339 /* remove the oldest history entry */
340 g_free(first->data);
341 first->data = NULL;
342 *history = g_list_delete_link(*history, first);
343 }
344 }
346 return g_realloc(line, strlen(line)+1);
347 }