implement word deletion via ^W

src/groupchat.c

@@ -482,9 +482,9 @@ static void groupchat_onDraw(ToxWindow *self, Tox *m)
 
         /* truncate nick to fit in side panel without modifying list */
         char tmpnck[TOX_MAX_NAME_LENGTH];
-        memcpy(tmpnck, &groupchats[self->num].peer_names[peer * N], SIDEBAR_WIDTH - 2);
-        int len = SIDEBAR_WIDTH - 2;
-        tmpnck[len] = '\0';
+        int maxlen = SIDEBAR_WIDTH - 2;
+        memcpy(tmpnck, &groupchats[self->num].peer_names[peer * N], maxlen);
+        tmpnck[maxlen] = '\0';
 
         wprintw(ctx->sidebar, "%s\n", tmpnck);
     }

src/input.c

@@ -83,6 +83,17 @@ static void input_delete(ToxWindow *self)
         sound_notify(self, error, 0, NULL);
 }
 
+/* delete last typed word */
+static void input_del_word(ToxWindow *self, int x, int mx_x)
+{
+    ChatContext *ctx = self->chatwin;
+
+    if (del_word_buf(ctx) == -1) {
+        sound_notify(self, error, 0, NULL);
+        return;
+    }
+}
+
 /* deletes entire line before cursor from input field and buffer */
 static void input_discard(ToxWindow *self)
 {
@@ -213,6 +224,10 @@ bool input_handle(ToxWindow *self, wint_t key, int x, int y, int mx_x, int mx_y)
             input_yank(self, x, mx_x);
             break;
 
+        case T_KEY_C_W:
+            input_del_word(self, x, mx_x);
+            break;
+
         case KEY_HOME:
         case T_KEY_C_A:
             input_mv_home(self);

src/toxic.h

@@ -63,6 +63,7 @@
 #define T_KEY_C_H        0x08     /* ctrl-h */
 #define T_KEY_C_Y        0x19     /* ctrl-y */
 #define T_KEY_C_L        0x0C     /* ctrl-l */
+#define T_KEY_C_W        0x17     /* ctrl-w */
 #define T_KEY_TAB        0x09     /* TAB key */
 
 #define ONLINE_CHAR "*"

src/toxic_strings.c

@@ -121,6 +121,39 @@ int yank_buf(ChatContext *ctx)
     ctx->pos += ctx->yank_len;
     ctx->len += ctx->yank_len;
     ctx->line[ctx->len] = L'\0';
+
+    return 0;
+}
+
+/* Deletes all characters from line starting at pos and going backwards 
+   until we find a space or run out of characters.
+   Return 0 on success, -1 if nothing to delete */
+int del_word_buf(ChatContext *ctx)
+{
+    if (ctx->len == 0 || ctx->pos == 0)
+        return -1;
+
+    int i = ctx->pos, count = 0;
+
+    /* traverse past empty space */
+    while (i > 0 && ctx->line[i-1] == L' ') {
+        ++count;
+        --i;
+    }
+
+    /* traverse past last entered word */
+    while (i > 0 && ctx->line[i-1] != L' ') {
+        ++count;
+        --i;
+    }
+
+    wmemmove(&ctx->line[i], &ctx->line[ctx->pos], ctx->len - ctx->pos);
+
+    ctx->start = MAX(0, ctx->start - count);   /* TODO: take into account widechar */
+    ctx->len -= count;
+    ctx->pos -= count;
+    ctx->line[ctx->len] = L'\0';
+
     return 0;
 }
 

src/toxic_strings.h

@@ -49,6 +49,11 @@ void reset_buf(ChatContext *ctx);
    Return 0 on success, -1 if yank buffer is empty or too long */
 int yank_buf(ChatContext *ctx);
 
+/* Deletes all characters from line starting at pos and going backwards 
+   until we find a space or run out of characters.
+   Return 0 on success, -1 if no line or already at the beginning */
+int del_word_buf(ChatContext *ctx);
+
 /* Removes trailing spaces from line. */
 void rm_trailing_spaces_buf(ChatContext *ctx);