When pasting, translate \n into \r. This matches xterm and putty's behaviour,

and makes emacs happy when pasting into some modes. A new -r (raw) flag to
paste-buffer pastes without the translation.

From Kalle Olavi Niemitalo, thanks!

cmd-generic.c

@@ -23,9 +23,9 @@
 
 #include "tmux.h"
 
-#define CMD_FLAGS "adDgkuU"
+#define CMD_FLAGS "adDgkruU"
 #define CMD_FLAGMASK (CMD_AFLAG|CMD_DFLAG|CMD_BIGDFLAG|CMD_GFLAG|CMD_KFLAG| \
-    CMD_UFLAG|CMD_BIGUFLAG)
+    CMD_RFLAG|CMD_UFLAG|CMD_BIGUFLAG)
 
 int	cmd_do_flags(int, int, int *);
 size_t	cmd_print_flags(char *, size_t, size_t, int);
@@ -73,6 +73,12 @@ cmd_do_flags(int opt, int iflags, int *oflags)
 			return (0);
 		}
 		return (-1);
+	case 'r':
+		if (iflags & CMD_RFLAG) {
+			(*oflags) |= CMD_RFLAG;
+			return (0);
+		}
+		return (-1);
 	case 'u':
 		if (iflags & CMD_UFLAG) {
 			(*oflags) |= CMD_UFLAG;
@@ -107,6 +113,8 @@ cmd_print_flags(char *buf, size_t len, size_t off, int flags)
 		off += xsnprintf(buf + off, len - off, "g");
 	if (off < len && flags & CMD_KFLAG)
 		off += xsnprintf(buf + off, len - off, "k");
+	if (off < len && flags & CMD_RFLAG)
+		off += xsnprintf(buf + off, len - off, "r");
 	if (off < len && flags & CMD_UFLAG)
 		off += xsnprintf(buf + off, len - off, "u");
 	if (off < len && flags & CMD_BIGUFLAG)

cmd-paste-buffer.c

@@ -27,11 +27,12 @@
  */
 
 int	cmd_paste_buffer_exec(struct cmd *, struct cmd_ctx *);
+void	cmd_paste_buffer_lf2cr(struct buffer *, const char *, size_t);
 
 const struct cmd_entry cmd_paste_buffer_entry = {
 	"paste-buffer", "pasteb",
-	"[-d] " CMD_BUFFER_WINDOW_USAGE,
-	CMD_DFLAG,
+	"[-dr] " CMD_BUFFER_WINDOW_USAGE,
+	CMD_DFLAG|CMD_RFLAG,
 	cmd_buffer_init,
 	cmd_buffer_parse,
 	cmd_paste_buffer_exec,
@@ -63,8 +64,16 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 		}
 	}
 
-	if (pb != NULL && *pb->data != '\0')
-		buffer_write(w->active->out, pb->data, strlen(pb->data));
+	if (pb != NULL && *pb->data != '\0') {
+		/* -r means raw data without LF->CR conversion. */
+		if (data->flags & CMD_RFLAG) {
+			buffer_write(
+			    w->active->out, pb->data, strlen(pb->data));
+		} else {
+			cmd_paste_buffer_lf2cr(
+			    w->active->out, pb->data, strlen(pb->data));
+		}
+	}
 
 	/* Delete the buffer if -d. */
 	if (data->flags & CMD_DFLAG) {
@@ -76,3 +85,21 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 
  	return (0);
 }
+
+/* Add bytes to a buffer but change every '\n' to '\r'. */
+void
+cmd_paste_buffer_lf2cr(struct buffer *b, const char *data, size_t size)
+{
+	const char	*end = data + size;
+	const char	*lf;
+
+	while ((lf = memchr(data, '\n', end - data)) != NULL) {
+		if (lf != data)
+			buffer_write(b, data, lf - data);
+		buffer_write8(b, '\r');
+		data = lf + 1;
+	}
+
+	if (end != data)
+		buffer_write(b, data, end - data);
+}

tmux.1

@@ -897,6 +897,11 @@ Insert the contents of a paste buffer into the current window.
 With
 .Fl d ,
 also delete the paste buffer from the stack.
+When output, any linefeed (LF) characters in the paste buffer are replaced with
+carriage returns (CR).
+This translation may be disabled with the
+.Fl r
+flag.
 .It Xo Ic previous-window
 .Op Fl a
 .Op Fl t Ar target-session

tmux.h

@@ -858,6 +858,7 @@ struct cmd_entry {
 #define CMD_UFLAG 0x100
 #define CMD_BIGDFLAG 0x200
 #define CMD_BIGUFLAG 0x400
+#define CMD_RFLAG 0x800
 
 	int		 flags;