From 9c06ad608be1a8bc840e8bf0583bfce36b6c813c Mon Sep 17 00:00:00 2001
From: jfreegman <jfreegman@gmail.com>
Date: Sat, 10 Oct 2020 11:21:15 -0400
Subject: [PATCH] Add ability to skip words in input field with ctrl-left/right
 arrow

---
 src/input.c     | 62 +++++++++++++++++++++++++++++++++++++++++++++----
 src/osx_video.m |  2 +-
 src/toxic.h     |  2 ++
 3 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/src/input.c b/src/input.c
index 677cf8d..845f138 100644
--- a/src/input.c
+++ b/src/input.c
@@ -100,7 +100,6 @@ static void input_del_word(ToxWindow *self)
 
     if (del_word_buf(ctx) == -1) {
         sound_notify(self, notif_error, 0, NULL);
-        return;
     }
 }
 
@@ -172,17 +171,41 @@ static void input_mv_left(ToxWindow *self, int x, int mx_x)
     }
 
     int cur_len = ctx->pos > 0 ? wcwidth(ctx->line[ctx->pos - 1]) : 0;
-    int s_len = ctx->start > 0 ? wcwidth(ctx->line[ctx->start - 1]) : 0;
 
     --ctx->pos;
 
-    if (ctx->start && (x >= mx_x - cur_len)) {
+    if (ctx->start > 0 && (x >= mx_x - cur_len)) {
+        int s_len = wcwidth(ctx->line[ctx->start - 1]);
         ctx->start = MAX(0, ctx->start - 1 + (s_len - cur_len));
-    } else if (ctx->start) {
+    } else if (ctx->start > 0) {
         ctx->start = MAX(0, ctx->start - cur_len);
     }
 }
 
+/* moves the cursor to the beginning of the previous word in input field and buffer */
+static void input_skip_left(ToxWindow *self, int x, int mx_x)
+{
+    ChatContext *ctx = self->chatwin;
+
+    if (ctx->pos <= 0) {
+        return;
+    }
+
+    int count = 0;
+
+    do {
+        --ctx->pos;
+        count += wcwidth(ctx->line[ctx->pos]);
+    } while (ctx->pos > 0 && (ctx->line[ctx->pos - 1] != L' ' || ctx->line[ctx->pos] == L' '));
+
+    if (ctx->start > 0 && (x >= mx_x - count)) {
+        int s_len = wcwidth(ctx->line[ctx->start - 1]);
+        ctx->start = MAX(0, ctx->start - 1 + (s_len - count));
+    } else if (ctx->start > 0) {
+        ctx->start = MAX(0, ctx->start - count);
+    }
+}
+
 /* moves cursor/line position right in input field and buffer */
 static void input_mv_right(ToxWindow *self, int x, int mx_x)
 {
@@ -202,6 +225,29 @@ static void input_mv_right(ToxWindow *self, int x, int mx_x)
     }
 }
 
+/* moves the cursor to the end of the next word in input field and buffer */
+static void input_skip_right(ToxWindow *self, int x, int mx_x)
+{
+    ChatContext *ctx = self->chatwin;
+
+    if (ctx->pos >= ctx->len) {
+        return;
+    }
+
+    int count = 0;
+
+    do {
+        count += wcwidth(ctx->line[ctx->pos]);
+        ++ctx->pos;
+    } while (ctx->pos < ctx->len && !(ctx->line[ctx->pos] == L' ' && ctx->line[ctx->pos - 1] != L' '));
+
+    int newpos = x + count;
+
+    if (newpos >= mx_x) {
+        ctx->start += (1 + (newpos - mx_x));
+    }
+}
+
 /* puts a line history item in input field and buffer */
 static void input_history(ToxWindow *self, wint_t key, int mx_x)
 {
@@ -271,6 +317,14 @@ bool input_handle(ToxWindow *self, wint_t key, int x, int mx_x)
             force_refresh(self->chatwin->history);
             break;
 
+        case T_KEY_C_LEFT:
+            input_skip_left(self, x, mx_x);
+            break;
+
+        case T_KEY_C_RIGHT:
+            input_skip_right(self, x, mx_x);
+            break;
+
         default:
             match = false;
             break;
diff --git a/src/osx_video.m b/src/osx_video.m
index 379e394..457e905 100644
--- a/src/osx_video.m
+++ b/src/osx_video.m
@@ -343,4 +343,4 @@ int osx_video_read_device(uint8_t *y, uint8_t *u, uint8_t *v, uint16_t *width, u
  * End of C-interface for OSXVideo
  */
 
-#endif /* __OBJC__ */
\ No newline at end of file
+#endif /* __OBJC__ */
diff --git a/src/toxic.h b/src/toxic.h
index 82c6cc9..569401b 100644
--- a/src/toxic.h
+++ b/src/toxic.h
@@ -71,6 +71,8 @@
 #define T_KEY_C_W        0x17     /* ctrl-w */
 #define T_KEY_C_B        0x02     /* ctrl-b */
 #define T_KEY_C_T        0x14     /* ctrl-t */
+#define T_KEY_C_LEFT     0x221    /* ctrl-left arrow */
+#define T_KEY_C_RIGHT    0x230    /* ctrl-right arrow */
 #define T_KEY_TAB        0x09     /* TAB key */
 
 #define ONLINE_CHAR "*"