slackline: implement sl_move() to handle cursor movement - lchat - A line oriented chat front end for ii.
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---
(DIR) commit f7052595cdec83861c5f28bc5e579c6238b5aced
(DIR) parent 1971dd4cb092a1d603d41bc35cb5b6425394d194
(HTM) Author: Tom Schwindl <schwindl@posteo.de>
Date: Thu, 13 Oct 2022 16:23:21 +0200
slackline: implement sl_move() to handle cursor movement
Diffstat:
M slackline.c | 67 ++++++++++++++++++-------------
1 file changed, 39 insertions(+), 28 deletions(-)
---
(DIR) diff --git a/slackline.c b/slackline.c
@@ -24,6 +24,8 @@
#include "slackline.h"
+enum direction {LEFT, RIGHT, HOME, END};
+
struct slackline *
sl_init(void)
{
@@ -112,6 +114,35 @@ sl_backspace(struct slackline *sl)
sl->ptr = ncur;
}
+static void
+sl_move(struct slackline *sl, enum direction dir)
+{
+ switch (dir) {
+ case HOME:
+ sl->bcur = sl->rcur = 0;
+ sl->ptr = sl->buf;
+ return;
+ case END:
+ sl->rcur = sl->rlen;
+ sl->bcur = sl_postobyte(sl, sl->rcur);
+ sl->ptr = sl->buf + sl->bcur;
+ return;
+ case RIGHT:
+ if (sl->rcur < sl->rlen)
+ sl->rcur++;
+ break;
+ case LEFT:
+ if (sl->rcur > 0) {
+ sl->rcur--;
+ sl->bcur = sl_postobyte(sl, sl->rcur);
+ }
+ break;
+ }
+
+ sl->bcur = sl_postobyte(sl, sl->rcur);
+ sl->ptr = sl->buf + sl->bcur;
+}
+
int
sl_keystroke(struct slackline *sl, int key)
{
@@ -133,39 +164,22 @@ sl_keystroke(struct slackline *sl, int key)
case 'B': /* down */
break;
case 'C': /* right */
- if (sl->rcur < sl->rlen)
- sl->rcur++;
- sl->bcur = sl_postobyte(sl, sl->rcur);
- sl->ptr = sl->buf + sl->bcur;
+ sl_move(sl, RIGHT);
break;
case 'D': /* left */
- if (sl->rcur > 0)
- sl->rcur--;
- sl->bcur = sl_postobyte(sl, sl->rcur);
- sl->ptr = sl->buf + sl->bcur;
+ sl_move(sl, LEFT);
break;
case 'H': /* Home */
- sl->bcur = sl->rcur = 0;
- sl->ptr = sl->buf;
+ sl_move(sl, HOME);
break;
case 'F': /* End */
- sl->rcur = sl->rlen;
- sl->bcur = sl_postobyte(sl, sl->rcur);
- sl->ptr = sl->buf + sl->bcur;
+ sl_move(sl, END);
break;
case 'P': /* delete */
if (sl->rcur == sl->rlen)
break;
-
- char *ncur = sl_postoptr(sl, sl->rcur + 1);
-
- memmove(sl->ptr, ncur, sl->last - ncur);
-
- sl->rlen--;
- sl->blen = sl_postobyte(sl, sl->rlen);
-
- sl->last -= ncur - sl->ptr;
- *sl->last = '\0';
+ sl_move(sl, RIGHT);
+ sl_backspace(sl);
break;
case '0':
case '1':
@@ -188,13 +202,10 @@ sl_keystroke(struct slackline *sl, int key)
case '~':
switch(sl->nummod) {
case '7':
- sl->bcur = sl->rcur = 0;
- sl->ptr = sl->buf;
+ sl_move(sl, HOME);
break;
case '8':
- sl->rcur = sl->rlen;
- sl->bcur = sl_postobyte(sl, sl->rcur);
- sl->ptr = sl->buf + sl->bcur;
+ sl_move(sl, END);
break;
}
sl->esc = ESC_NONE;