Add a "delete line" key when editing in the status line or the search up/down

prompt. C-u with emacs keys, d with vi.

mode-key.c

@@ -47,6 +47,7 @@ struct mode_key_cmdstr mode_key_cmdstr_edit[] = {
 	{ MODEKEYEDIT_CURSORLEFT, "cursor-left" },
 	{ MODEKEYEDIT_CURSORRIGHT, "cursor-right" },
 	{ MODEKEYEDIT_DELETE, "delete" },
+	{ MODEKEYEDIT_DELETELINE, "delete-line" },
 	{ MODEKEYEDIT_DELETETOENDOFLINE, "delete-end-of-line" },
 	{ MODEKEYEDIT_ENDOFLINE, "end-of-line" },
 	{ MODEKEYEDIT_ENTER, "enter" },
@@ -109,6 +110,7 @@ const struct mode_key_entry mode_key_vi_edit[] = {
 
 	{ '$',			1, MODEKEYEDIT_ENDOFLINE },
 	{ '0',			1, MODEKEYEDIT_STARTOFLINE },
+	{ 'd',			1, MODEKEYEDIT_DELETELINE },
 	{ 'D',			1, MODEKEYEDIT_DELETETOENDOFLINE },
 	{ '\003' /* C-c */,	1, MODEKEYEDIT_CANCEL },
 	{ '\010' /* C-h */, 	1, MODEKEYEDIT_BACKSPACE },
@@ -194,10 +196,11 @@ const struct mode_key_entry mode_key_emacs_edit[] = {
 	{ '\005' /* C-e	*/,	0, MODEKEYEDIT_ENDOFLINE },
 	{ '\006' /* C-f */,	0, MODEKEYEDIT_CURSORRIGHT },
 	{ '\010' /* C-H */, 	0, MODEKEYEDIT_BACKSPACE },
-	{ '\011' /* Tab */,	0, MODEKEYEDIT_COMPLETE },
+	{ '\011' /* Tab */,     0, MODEKEYEDIT_COMPLETE },
 	{ '\013' /* C-k	*/,	0, MODEKEYEDIT_DELETETOENDOFLINE },
 	{ '\016' /* C-n */,	0, MODEKEYEDIT_HISTORYDOWN },
 	{ '\020' /* C-p */,	0, MODEKEYEDIT_HISTORYUP },
+	{ '\025' /* C-u	*/,	0, MODEKEYEDIT_DELETELINE },
 	{ '\031' /* C-y */,	0, MODEKEYEDIT_PASTE },
 	{ '\033' /* Escape */,	0, MODEKEYEDIT_CANCEL },
 	{ '\r',			0, MODEKEYEDIT_ENTER },

status.c

@@ -854,6 +854,11 @@ status_prompt_key(struct client *c, int key)
 			c->flags |= CLIENT_STATUS;
 		}
 		break;
+	case MODEKEYEDIT_DELETELINE:
+		*c->prompt_buffer = '\0';
+		c->prompt_index = 0;
+		c->flags |= CLIENT_STATUS;
+		break;
 	case MODEKEYEDIT_DELETETOENDOFLINE:
 		if (c->prompt_index < size) {
 			c->prompt_buffer[c->prompt_index] = '\0';

tmux.1

@@ -482,6 +482,7 @@ The following keys are supported as appropriate for the mode:
 .It Li "Cursor left" Ta "h" Ta "Left"
 .It Li "Cursor right" Ta "l" Ta "Right"
 .It Li "Cursor up" Ta "k" Ta "Up"
+.It Li "Delete entire line" Ta "d" Ta "C-u"
 .It Li "Delete to end of line" Ta "D" Ta "C-k"
 .It Li "End of line" Ta "$" Ta "C-e"
 .It Li "Goto line" Ta "g" Ta "g"

tmux.h

@@ -369,6 +369,7 @@ enum mode_key_cmd {
 	MODEKEYEDIT_CURSORLEFT,
 	MODEKEYEDIT_CURSORRIGHT,
 	MODEKEYEDIT_DELETE,
+	MODEKEYEDIT_DELETELINE,
 	MODEKEYEDIT_DELETETOENDOFLINE,
 	MODEKEYEDIT_ENDOFLINE,
 	MODEKEYEDIT_ENTER,

window-copy.c

@@ -365,6 +365,9 @@ window_copy_key_input(struct window_pane *wp, int key)
 		if (inputlen > 0)
 			data->inputstr[inputlen - 1] = '\0';
 		break;
+	case MODEKEYEDIT_DELETELINE:
+		*data->inputstr = '\0';
+		break;
 	case MODEKEYEDIT_ENTER:
 		switch (data->inputtype) {
 		case WINDOW_COPY_OFF: