Bugfix: copy line binding never yanks newlines

This addresses a tmux/bash issue that occurs for commands with multiple
lines. When 'C-e' is pressed in a command, this confuses tmux so
newlines are yanked in copy-mode.

When a user wants to line-yank multiple-line command he is better off
when newlines aren't yanked.
This commit reliably enables this.

Fixes #13

CHANGELOG.md

@@ -7,6 +7,8 @@
 - fix bug when yank-line is used in the last line in buffer. New 'solution' is
   implemented for copying multiple lines.
 - code cleanup
+- yank-line never yanks 'newline' char for multiple-line commands in shell (this
+  is actually tmux/bash bug).
 
 ### v0.0.2, Jun 25, 2014
 

scripts/copy_line.sh

@@ -63,7 +63,7 @@ end_of_line_in_copy_mode() {
 }
 
 yank_to_clipboard() {
-	tmux send-key "$(yank_key)"
+	tmux send-key "$(yank_wo_newline_key)"
 }
 
 go_to_the_end_of_current_line() {

scripts/key_binding_helpers.sh

@@ -10,6 +10,9 @@ put_option="@copy_mode_put"
 yank_put_default="M-y"
 yank_put_option="@copy_mode_yank_put"
 
+yank_wo_newline_default="!"
+yank_wo_newline_option="@copy_mode_yank_wo_newline"
+
 # helper functions
 get_tmux_option() {
 	local option="$1"
@@ -38,6 +41,10 @@ yank_put_key() {
 	echo "$(get_tmux_option "$yank_put_option" "$yank_put_default")"
 }
 
+yank_wo_newline_key() {
+	echo "$(get_tmux_option "$yank_wo_newline_option" "$yank_wo_newline_default")"
+}
+
 # Ensures a message is displayed for 5 seconds in tmux prompt.
 # Does not override the 'display-time' tmux option.
 display_message() {

yank.tmux

@@ -18,6 +18,11 @@ clipboard_copy_command() {
 	fi
 }
 
+clipboard_copy_without_newline_command() {
+	local copy_command="$1"
+	echo "tr -d '\n' | $copy_command"
+}
+
 set_error_bindings() {
 	local key_bindings="$(yank_key) $(put_key) $(yank_put_key)"
 	local key
@@ -35,15 +40,20 @@ error_handling_if_command_not_present() {
 	fi
 }
 
+# `yank_without_newline` binding isn't intended to be used by the user. It is
+# a helper for `copy_line` command.
 set_copy_mode_bindings() {
 	local copy_command="$1"
+	local copy_wo_newline_command="$(clipboard_copy_without_newline_command "$copy_command")"
 	tmux bind-key -t vi-copy "$(yank_key)"     copy-pipe "$copy_command"
 	tmux bind-key -t vi-copy "$(put_key)"      copy-pipe "tmux paste-buffer"
 	tmux bind-key -t vi-copy "$(yank_put_key)" copy-pipe "$copy_command; tmux paste-buffer"
+	tmux bind-key -t vi-copy "$(yank_wo_newline_key)" copy-pipe "$copy_wo_newline_command"
 
 	tmux bind-key -t emacs-copy "$(yank_key)"     copy-pipe "$copy_command"
 	tmux bind-key -t emacs-copy "$(put_key)"      copy-pipe "tmux paste-buffer"
 	tmux bind-key -t emacs-copy "$(yank_put_key)" copy-pipe "$copy_command; tmux paste-buffer"
+	tmux bind-key -t emacs-copy "$(yank_wo_newline_key)" copy-pipe "$copy_wo_newline_command"
 }
 
 set_copy_line_bindings() {