Support UTF-8 with choose-buffer, from Kosuke ASAMI. Also make

buffer_sample bigger to let it trim at window right edge.

cmd-choose-buffer.c

@@ -49,6 +49,7 @@ cmd_choose_buffer_exec(struct cmd *self, struct cmd_q *cmdq)
 	char				*action, *action_data;
 	const char			*template;
 	u_int				 idx;
+	int				 utf8flag;
 
 	if ((c = cmd_current_client(cmdq)) == NULL) {
 		cmdq_error(cmdq, "no client available");
@@ -60,6 +61,7 @@ cmd_choose_buffer_exec(struct cmd *self, struct cmd_q *cmdq)
 
 	if ((wl = cmd_find_window(cmdq, args_get(args, 't'), NULL)) == NULL)
 		return (CMD_RETURN_ERROR);
+	utf8flag = options_get_number(&wl->window->options, "utf8");
 
 	if (paste_get_top(&global_buffers) == NULL)
 		return (CMD_RETURN_NORMAL);
@@ -79,7 +81,7 @@ cmd_choose_buffer_exec(struct cmd *self, struct cmd_q *cmdq)
 
 		cdata->ft_template = xstrdup(template);
 		format_add(cdata->ft, "line", "%u", idx - 1);
-		format_paste_buffer(cdata->ft, pb);
+		format_paste_buffer(cdata->ft, pb, utf8flag);
 
 		xasprintf(&action_data, "%u", idx - 1);
 		cdata->command = cmd_template_replace(action, action_data, 1);

cmd-list-buffers.c

@@ -55,7 +55,7 @@ cmd_list_buffers_exec(unused struct cmd *self, struct cmd_q *cmdq)
 	while ((pb = paste_walk_stack(&global_buffers, &idx)) != NULL) {
 		ft = format_create();
 		format_add(ft, "line", "%u", idx - 1);
-		format_paste_buffer(ft, pb);
+		format_paste_buffer(ft, pb, 0);
 
 		line = format_expand(ft, template);
 		cmdq_print(cmdq, "%s", line);

format.c

@@ -601,12 +601,14 @@ format_window_pane(struct format_tree *ft, struct window_pane *wp)
 
 /* Set default format keys for paste buffer. */
 void
-format_paste_buffer(struct format_tree *ft, struct paste_buffer *pb)
+format_paste_buffer(struct format_tree *ft, struct paste_buffer *pb,
+    int utf8flag)
 {
-	char	*pb_print = paste_print(pb, 50);
+	char	*s;
 
 	format_add(ft, "buffer_size", "%zu", pb->size);
-	format_add(ft, "buffer_sample", "%s", pb_print);
 
-	free(pb_print);
+	s = paste_make_sample(pb, utf8flag);
+	format_add(ft, "buffer_sample", "%s", s);
+	free(s);
 }

paste.c

@@ -148,25 +148,26 @@ paste_replace(struct paste_stack *ps, u_int idx, char *data, size_t size)
 	return (0);
 }
 
-/* Convert a buffer into a visible string. */
+/* Convert start of buffer into a nice string. */
 char *
-paste_print(struct paste_buffer *pb, size_t width)
+paste_make_sample(struct paste_buffer *pb, int utf8flag)
 {
-	char	*buf;
-	size_t	 len, used;
-
-	if (width < 3)
-		width = 3;
-	buf = xmalloc(width * 4 + 1);
+	char		*buf;
+	size_t		 len, used;
+	const int	 flags = VIS_OCTAL|VIS_TAB|VIS_NL;
+	const size_t	 width = 200;
 
 	len = pb->size;
 	if (len > width)
 		len = width;
+	buf = xmalloc(len * 4 + 4);
 
-	used = strvisx(buf, pb->data, len, VIS_OCTAL|VIS_TAB|VIS_NL);
+	if (utf8flag)
+		used = utf8_strvis(buf, pb->data, len, flags);
+	else
+		used = strvisx(buf, pb->data, len, flags);
 	if (pb->size > width || used > width)
-		strlcpy(buf + width - 3, "...", 4);
-
+		strlcpy(buf + width, "...", 4);
 	return (buf);
 }
 

tmux.1

@@ -3087,7 +3087,7 @@ The following variables are available, where appropriate:
 .It Li "alternate_on" Ta "" Ta "If pane is in alternate screen"
 .It Li "alternate_saved_x" Ta "" Ta "Saved cursor X in alternate screen"
 .It Li "alternate_saved_y" Ta "" Ta "Saved cursor Y in alternate screen"
-.It Li "buffer_sample" Ta "" Ta "First 50 characters from buffer"
+.It Li "buffer_sample" Ta "" Ta "Sample of start of buffer"
 .It Li "buffer_size" Ta "" Ta "Size of the specified buffer in bytes"
 .It Li "client_activity" Ta "" Ta "Integer time client last had activity"
 .It Li "client_activity_string" Ta "" Ta "String time client last had activity"

tmux.h

@@ -85,7 +85,7 @@ extern char   **environ;
 
 /* Default template for choose-buffer. */
 #define CHOOSE_BUFFER_TEMPLATE					\
-	"#{line}: #{buffer_size} bytes: \"#{buffer_sample}\""
+	"#{line}: #{buffer_size} bytes: #{buffer_sample}"
 
 /* Default template for choose-client. */
 #define CHOOSE_CLIENT_TEMPLATE					\
@@ -1544,7 +1544,7 @@ void		 format_winlink(struct format_tree *, struct session *,
 void		 format_window_pane(struct format_tree *,
 		     struct window_pane *);
 void		 format_paste_buffer(struct format_tree *,
-		     struct paste_buffer *);
+		     struct paste_buffer *, int);
 
 /* mode-key.c */
 extern const struct mode_key_table mode_key_tables[];
@@ -1714,7 +1714,7 @@ int		 paste_free_top(struct paste_stack *);
 int		 paste_free_index(struct paste_stack *, u_int);
 void		 paste_add(struct paste_stack *, char *, size_t, u_int);
 int		 paste_replace(struct paste_stack *, u_int, char *, size_t);
-char		*paste_print(struct paste_buffer *, size_t);
+char		*paste_make_sample(struct paste_buffer *, int);
 void		 paste_send_pane(struct paste_buffer *, struct window_pane *,
 		     const char *, int);
 
@@ -2326,6 +2326,7 @@ int	utf8_open(struct utf8_data *, u_char);
 int	utf8_append(struct utf8_data *, u_char);
 u_int	utf8_combine(const struct utf8_data *);
 u_int	utf8_split2(u_int, u_char *);
+int	utf8_strvis(char *, const char *, size_t, int);
 
 /* procname.c */
 char   *get_proc_name(int, char *);

utf8.c

@@ -19,6 +19,7 @@
 #include <sys/types.h>
 
 #include <string.h>
+#include <vis.h>
 
 #include "tmux.h"
 
@@ -350,3 +351,45 @@ utf8_width(const struct utf8_data *utf8data)
 	}
 	return (1);
 }
+
+/*
+ * Encode len characters from src into dst, which is guaranteed to have four
+ * bytes available for each character from src (for \abc or UTF-8) plus space
+ * for \0.
+ */
+int
+utf8_strvis(char *dst, const char *src, size_t len, int flag)
+{
+	struct utf8_data	 utf8data;
+	const char		*start, *end;
+	int			 more;
+	size_t			 i;
+
+	start = dst;
+	end = src + len;
+
+	while (src < end) {
+		if (utf8_open(&utf8data, *src)) {
+			more = 1;
+			while (++src < end && more)
+				more = utf8_append(&utf8data, *src);
+			if (!more) {
+				/* UTF-8 character finished. */
+				for (i = 0; i < utf8data.size; i++)
+					*dst++ = utf8data.data[i];
+				continue;
+			} else if (utf8data.have > 0) {
+				/* Not a complete UTF-8 character. */
+				src -= utf8data.have;
+			}
+		}
+		if (src < end - 1)
+			dst = vis(dst, src[0], flag, src[1]);
+		else if (src < end)
+			dst = vis(dst, src[0], flag, '\0');
+		src++;
+	}
+
+	*dst = '\0';
+	return (dst - start);
+}