From 161b57869e12a0fd8a95965e98b4866f6055f860 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 19 Mar 2019 19:01:50 +0000
Subject: [PATCH] Add a cursor_character format.

---
 format.c | 17 +++++++++++++++++
 tmux.1   |  1 +
 2 files changed, 18 insertions(+)

diff --git a/format.c b/format.c
index 30391da1..8fe0b55b 100644
--- a/format.c
+++ b/format.c
@@ -685,6 +685,21 @@ format_cb_pane_in_mode(struct format_tree *ft, struct format_entry *fe)
 	xasprintf(&fe->value, "%u", n);
 }
 
+/* Callback for cursor_character. */
+static void
+format_cb_cursor_character(struct format_tree *ft, struct format_entry *fe)
+{
+	struct window_pane	*wp = ft->wp;
+	struct grid_cell	 gc;
+
+	if (wp == NULL)
+		return;
+
+	grid_view_get_cell(wp->base.grid, wp->base.cx, wp->base.cy, &gc);
+	if (~gc.flags & GRID_FLAG_PADDING)
+		xasprintf(&fe->value, "%.*s", (int)gc.data.size, gc.data.data);
+}
+
 /* Merge a format tree. */
 static void
 format_merge(struct format_tree *ft, struct format_tree *from)
@@ -2031,6 +2046,8 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 
 	format_add(ft, "cursor_x", "%u", wp->base.cx);
 	format_add(ft, "cursor_y", "%u", wp->base.cy);
+	format_add_cb(ft, "cursor_character", format_cb_cursor_character);
+
 	format_add(ft, "scroll_region_upper", "%u", wp->base.rupper);
 	format_add(ft, "scroll_region_lower", "%u", wp->base.rlower);
 
diff --git a/tmux.1 b/tmux.1
index 1ff00bba..8d8c3c00 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3744,6 +3744,7 @@ The following variables are available, where appropriate:
 .It Li "command_list_alias" Ta "" Ta "Command alias if listing commands"
 .It Li "command_list_usage" Ta "" Ta "Command usage if listing commands"
 .It Li "cursor_flag" Ta "" Ta "Pane cursor flag"
+.It Li "cursor_character" Ta "Character at cursor in pane"
 .It Li "cursor_x" Ta "" Ta "Cursor X position in pane"
 .It Li "cursor_y" Ta "" Ta "Cursor Y position in pane"
 .It Li "history_bytes" Ta "" Ta "Number of bytes in window history"