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-rw-r--r--src/wreadln.c339
1 files changed, 339 insertions, 0 deletions
diff --git a/src/wreadln.c b/src/wreadln.c
new file mode 100644
index 000000000..6ac94b7dc
--- /dev/null
+++ b/src/wreadln.c
@@ -0,0 +1,339 @@
+/*
+ * $Id$
+ *
+ * (c) 2004 by Kalle Wallin <kaw@linux.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ncurses.h>
+#include <glib.h>
+
+#include "wreadln.h"
+
+#define KEY_CTRL_A 1
+#define KEY_CTRL_D 4
+#define KEY_CTRL_E 5
+#define KEY_CTRL_G 7
+#define KEY_CTRL_K 11
+#define KEY_BCKSPC 8
+#define TAB 9
+
+#define WRLN_MAX_LINE_SIZE 1024
+#define WRLN_MAX_HISTORY_LENGTH 32
+
+unsigned int wrln_max_line_size = WRLN_MAX_LINE_SIZE;
+unsigned int wrln_max_history_length = WRLN_MAX_HISTORY_LENGTH;
+GVoidFunc wrln_resize_callback = NULL;
+
+
+char *
+wreadln(WINDOW *w,
+ char *prompt,
+ char *initial_value,
+ int x1,
+ GList **history,
+ GCompletion *gcmp)
+{
+ GList *hlist = NULL, *hcurrent = NULL;
+ char *line;
+ int x0, y, width;
+ int cursor = 0, start = 0;
+ int key = 0, i;
+
+ /* move the cursor one step to the right */
+ void cursor_move_right(void) {
+ if( cursor < strlen(line) && cursor<wrln_max_line_size-1 )
+ {
+ cursor++;
+ if( cursor+x0 >= x1 && start<cursor-width+1)
+ start++;
+ }
+ }
+ /* move the cursor one step to the left */
+ void cursor_move_left(void) {
+ if( cursor > 0 )
+ {
+ if( cursor==start && start > 0 )
+ start--;
+ cursor--;
+ }
+ }
+ /* move the cursor to the end of the line */
+ void cursor_move_to_eol(void) {
+ cursor = strlen(line);
+ if( cursor+x0 >= x1 )
+ start = cursor-width+1;
+ }
+ /* draw line buffer and update cursor position */
+ void drawline() {
+ wmove(w, y, x0);
+ /* clear input area */
+ whline(w, ' ', width);
+ /* print visible part of the line buffer */
+ waddnstr(w, line+start, width);
+ /* move the cursor to the correct position */
+ wmove(w, y, x0 + cursor-start);
+ /* tell ncurses to redraw the screen */
+ doupdate();
+ }
+
+
+ /* allocate a line buffer */
+ line = g_malloc0(wrln_max_line_size);
+ /* turn off echo */
+ noecho();
+ /* make shure the cursor is visible */
+ curs_set(1);
+ /* print prompt string */
+ if( prompt )
+ waddstr(w, prompt);
+ /* retrive y and x0 position */
+ getyx(w, y, x0);
+ /* check the x1 value */
+ if( x1<=x0 || x1>COLS )
+ x1 = COLS;
+ width = x1-x0;
+ /* clear input area */
+ mvwhline(w, y, x0, ' ', width);
+
+ if( history )
+ {
+ /* append the a new line to our history list */
+ *history = g_list_append(*history, g_malloc0(wrln_max_line_size));
+ /* hlist points to the current item in the history list */
+ hlist = g_list_last(*history);
+ hcurrent = hlist;
+ }
+
+ if( initial_value == (char *) -1 )
+ {
+ /* get previous history entry */
+ if( history && hlist->prev )
+ {
+ if( hlist==hcurrent )
+ {
+ /* save the current line */
+ strncpy(hlist->data, line, wrln_max_line_size);
+ }
+ /* get previous line */
+ hlist = hlist->prev;
+ strncpy(line, hlist->data, wrln_max_line_size);
+ }
+ cursor_move_to_eol();
+ drawline();
+ }
+ else if( initial_value )
+ {
+ /* copy the initial value to the line buffer */
+ strncpy(line, initial_value, wrln_max_line_size);
+ cursor_move_to_eol();
+ drawline();
+ }
+
+ while( key!=13 && key!='\n' )
+ {
+ key = wgetch(w);
+
+ /* check if key is a function key */
+ for(i=0; i<63; i++)
+ if( key==KEY_F(i) )
+ {
+ key=KEY_F(1);
+ i=64;
+ }
+
+ switch (key)
+ {
+ case ERR:
+ /* ingnore errors */
+ break;
+
+ case KEY_RESIZE:
+ /* a resize event -> call an external callback function */
+ if( wrln_resize_callback )
+ wrln_resize_callback();
+ if( x1>COLS )
+ {
+ x1=COLS;
+ width = x1-x0;
+ cursor_move_to_eol();
+ }
+ /* make shure the cursor is visible */
+ curs_set(1);
+ break;
+
+ case TAB:
+ if( gcmp && strlen(line))
+ {
+ char *prefix = NULL;
+ GList *list;
+
+ list = g_completion_complete(gcmp, line, &prefix);
+ if( prefix )
+ {
+ int len = strlen(prefix);
+ strncpy(line, prefix, len);
+ cursor_move_to_eol();
+ g_free(prefix);
+ }
+ else
+ beep();
+ }
+ break;
+
+ case KEY_CTRL_G:
+ beep();
+ g_free(line);
+ if( history )
+ {
+ g_free(hcurrent->data);
+ hcurrent->data = NULL;
+ *history = g_list_delete_link(*history, hcurrent);
+ }
+ return NULL;
+
+ case KEY_LEFT:
+ cursor_move_left();
+ break;
+ case KEY_RIGHT:
+ cursor_move_right();
+ break;
+ case KEY_HOME:
+ case KEY_CTRL_A:
+ cursor = 0;
+ start = 0;
+ break;
+ case KEY_END:
+ case KEY_CTRL_E:
+ cursor_move_to_eol();
+ break;
+ case KEY_CTRL_K:
+ line[cursor] = 0;
+ break;
+ case 127:
+ case KEY_BCKSPC: /* handle backspace: copy all */
+ case KEY_BACKSPACE: /* chars starting from curpos */
+ if( cursor > 0 ) /* - 1 from buf[n+1] to buf */
+ {
+ for (i = cursor - 1; line[i] != 0; i++)
+ line[i] = line[i + 1];
+ cursor_move_left();
+ }
+ break;
+ case KEY_DC: /* handle delete key. As above */
+ case KEY_CTRL_D:
+ if( cursor <= strlen(line) - 1 )
+ {
+ for (i = cursor; line[i] != 0; i++)
+ line[i] = line[i + 1];
+ }
+ break;
+ case KEY_UP:
+ /* get previous history entry */
+ if( history && hlist->prev )
+ {
+ if( hlist==hcurrent )
+ {
+ /* save the current line */
+ strncpy(hlist->data, line, wrln_max_line_size);
+ }
+ /* get previous line */
+ hlist = hlist->prev;
+ strncpy(line, hlist->data, wrln_max_line_size);
+ }
+ // if (cursor > strlen(line))
+ cursor_move_to_eol();
+ break;
+ case KEY_DOWN:
+ /* get next history entry */
+ if( history && hlist->next )
+ {
+ /* get next line */
+ hlist = hlist->next;
+ strncpy(line, hlist->data, wrln_max_line_size);
+ }
+ cursor_move_to_eol();
+ break;
+
+ case '\n':
+ case 13:
+ case KEY_IC:
+ case KEY_PPAGE:
+ case KEY_NPAGE:
+ case KEY_F(1):
+ /* ignore char */
+ break;
+ default:
+ if (key >= 32)
+ {
+ if (strlen (line + cursor)) /* if the cursor is */
+ { /* not at the last pos */
+ char *tmp = 0;
+ tmp = g_malloc0(strlen (line + cursor) + 1);
+ strcpy (tmp, line + cursor);
+ line[cursor] = key;
+ line[cursor + 1] = 0;
+ strcat (&line[cursor + 1], tmp);
+ g_free(tmp);
+ cursor_move_right();
+ }
+ else
+ {
+ line[cursor + 1] = 0;
+ line[cursor] = key;
+ cursor_move_right();
+ }
+ }
+ }
+
+ drawline();
+ }
+
+ /* update history */
+ if( history )
+ {
+ if( strlen(line) )
+ {
+ /* update the current history entry */
+ size_t size = strlen(line)+1;
+ hcurrent->data = g_realloc(hcurrent->data, size);
+ strncpy(hcurrent->data, line, size);
+ }
+ else
+ {
+ /* the line was empty - remove the current history entry */
+ g_free(hcurrent->data);
+ hcurrent->data = NULL;
+ *history = g_list_delete_link(*history, hcurrent);
+ }
+
+ while( g_list_length(*history) > wrln_max_history_length )
+ {
+ GList *first = g_list_first(*history);
+
+ /* remove the oldest history entry */
+ g_free(first->data);
+ first->data = NULL;
+ *history = g_list_delete_link(*history, first);
+ }
+ }
+
+ return g_realloc(line, strlen(line)+1);
+}
+
+
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