add line kill and discard ability

src/chat.c

@@ -296,6 +296,18 @@ static void chat_onKey(ToxWindow *self, Tox *m, wint_t key)
             del_char_buf_frnt(ctx->line, &ctx->pos, &ctx->len);
     }
 
+    else if (key == T_KEY_DISCARD) {    /* CTRL-U: Delete entire line behind pos */
+        if (ctx->pos > 0) {
+            discard_buf(ctx->line, &ctx->pos, &ctx->len);
+            wmove(self->window, y2 - CURS_Y_OFFSET, 0);
+        }
+    }
+
+    else if (key == T_KEY_KILL) {    /* CTRL-K: Delete entire line in front of pos */
+        if (ctx->pos != ctx->len)
+            kill_buf(ctx->line, &ctx->pos, &ctx->len);
+    }
+
     else if (key == KEY_HOME) {    /* HOME key: Move cursor to beginning of line */
         if (ctx->pos > 0) {
             ctx->pos = 0;

src/groupchat.c

@@ -239,6 +239,18 @@ static void groupchat_onKey(ToxWindow *self, Tox *m, wint_t key)
             del_char_buf_frnt(ctx->line, &ctx->pos, &ctx->len);
     }
 
+    else if (key == T_KEY_DISCARD) {    /* CTRL-U: Delete entire line behind pos */
+        if (ctx->pos > 0) {
+            discard_buf(ctx->line, &ctx->pos, &ctx->len);
+            wmove(self->window, y2 - CURS_Y_OFFSET, 0);
+        }
+    }
+
+    else if (key == T_KEY_KILL) {    /* CTRL-K: Delete entire line in front of pos */
+        if (ctx->pos != ctx->len)
+            kill_buf(ctx->line, &ctx->pos, &ctx->len);
+    }
+
     else if (key == KEY_HOME) {    /* HOME key: Move cursor to beginning of line */
         if (ctx->pos > 0) {
             ctx->pos = 0;

src/main.c

@@ -439,6 +439,7 @@ void exit_toxic(Tox *m)
     free(DATA_FILE);
     free(SRVLIST_FILE);
     free(prompt->stb);
+    free(prompt->promptbuf);
     tox_kill(m);
     endwin();
     exit(EXIT_SUCCESS);

src/misc_tools.c

@@ -211,6 +211,32 @@ void del_char_buf_frnt(wchar_t *buf, size_t *pos, size_t *len)
     --(*len);
 }
 
+/* Deletes the entire line before pos */
+void discard_buf(wchar_t *buf, size_t *pos, size_t *len)
+{
+    if (*pos <= 0)
+        return;
+
+    int i;
+    int c = 0;
+
+    for (i = *pos; i <= *len; ++i)
+        buf[c++] = buf[i];
+
+    *pos = 0;
+    *len = c - 1;
+}
+
+/* Deletes the entire line in front of pos */
+void kill_buf(wchar_t *buf, size_t *pos, size_t *len)
+{
+    if (*len == *pos)
+        return;
+
+    buf[*pos] = L'\0';
+    *len = *pos;
+}
+
 /* nulls buf and sets pos and len to 0 */
 void reset_buf(wchar_t *buf, size_t *pos, size_t *len)
 {

src/prompt.c

@@ -93,6 +93,16 @@ static void prompt_onKey(ToxWindow *self, Tox *m, wint_t key)
         }
     }
 
+    else if (key == T_KEY_DISCARD) {    /* CTRL-U: Delete entire line behind pos */
+        if (prt->pos > 0)
+            discard_buf(prt->line, &prt->pos, &prt->len);
+    }
+
+    else if (key == T_KEY_KILL) {    /* CTRL-K: Delete entire line in front of pos */
+        if (prt->len != prt->pos)
+            kill_buf(prt->line, &prt->pos, &prt->len);
+    }
+
     else if (key == KEY_HOME) {    /* HOME key: Move cursor to beginning of line */
         if (prt->pos != 0)
             prt->pos = 0;
@@ -125,7 +135,7 @@ static void prompt_onKey(ToxWindow *self, Tox *m, wint_t key)
     }
     /* RETURN key: execute command */
     else if (key == '\n') {
-        wprintw(self->window, "\n"); 
+        wprintw(self->window, "\n");
         uint8_t *line = wcs_to_char(prt->line);
         execute(self->window, self, m, line, GLOBAL_COMMAND_MODE);
         reset_buf(prt->line, &prt->pos, &prt->len);
@@ -153,9 +163,8 @@ static void prompt_onDraw(ToxWindow *self, Tox *m)
 
     if (prt->len > 0) {
         mvwprintw(self->window, prt->orig_y, X_OFST, wcs_to_char(prt->line));
-
         /* y distance between pos and len */
-        int d = prt->pos < (prt->len - px2) ? (y2 - y - 1) : 0;
+        int d = y2 - y - 1;
 
         /* 1 if end of line is touching bottom of window, 0 otherwise */
         int bot = prt->orig_y + ((prt->len + p_ofst) / px2) == y2;
@@ -166,14 +175,14 @@ static void prompt_onDraw(ToxWindow *self, Tox *m)
             prt->scroll = false;
         }
 
-    } else {
-        prt->orig_y = y;    /* Mark point of origin for new line */
-
-        wattron(self->window, COLOR_PAIR(GREEN));
-        mvwprintw(self->window, y, 0, "$ ");
-        wattroff(self->window, COLOR_PAIR(GREEN));
+    } else {    /* Mark point of origin for new line */
+        prt->orig_y = y;    
     }
 
+    wattron(self->window, COLOR_PAIR(GREEN));
+    mvwprintw(self->window, prt->orig_y, 0, "$ ");
+    wattroff(self->window, COLOR_PAIR(GREEN));
+
     StatusBar *statusbar = self->stb;
     werase(statusbar->topline);
     mvwhline(statusbar->topline, 1, 0, ACS_HLINE, x2);
@@ -216,8 +225,8 @@ static void prompt_onDraw(ToxWindow *self, Tox *m)
     wattroff(statusbar->topline, A_BOLD);
 
     /* put cursor back in correct spot */
-    int y_m = prt->pos <= 0 ? prt->orig_y : prt->orig_y + ((prt->pos + p_ofst) / px2);
-    int x_m = prt->pos > 0 ? (prt->pos + X_OFST) % x2 : X_OFST;
+    int y_m = prt->orig_y + ((prt->pos + p_ofst) / px2);
+    int x_m = (prt->pos + X_OFST) % x2;
     wmove(self->window, y_m, x_m);
 }
 
@@ -256,7 +265,6 @@ static void prompt_onConnectionChange(ToxWindow *self, Tox *m, int friendnum , u
         wprintw(self->window, "has gone offline\n");
         wattroff(self->window, COLOR_PAIR(RED));
     }
-
 }
 
 static void prompt_onFriendRequest(ToxWindow *self, uint8_t *key, uint8_t *data, uint16_t length)

src/prompt.h

@@ -5,7 +5,7 @@
 #ifndef PROMPT_H_UZYGWFFL
 #define PROMPT_H_UZYGWFFL
 
-#define X_OFST 2    /* offset to account for prompt "# " */
+#define X_OFST 2    /* offset to account for prompt char */
 
 ToxWindow new_prompt(void);
 void prompt_init_statusbar(ToxWindow *self, Tox *m);

src/toxic_windows.h

@@ -29,6 +29,9 @@
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1
 
+#define T_KEY_KILL 0xB      /* ASCII code for ctrl-k */
+#define T_KEY_DISCARD 0x15  /* ASCII code for ctrl-u */
+
 /* Curses foreground colours (background is black) */
 enum {
     WHITE,
@@ -114,7 +117,7 @@ struct PromptBuf {
     wchar_t line[MAX_STR_SIZE];
     size_t pos;
     size_t len;
-    int orig_y;
+    int orig_y;    /* y axis point of origin for line */
     bool scroll;    /* used for prompt window hack to determine when to scroll down */
     WINDOW *linewin;
 };