Use flag to get buffer history size

CHANGELOG.md

@@ -3,6 +3,8 @@
 ### master
 - `capture-pane` gets a `-J` flag. It joins wrapped lines and preserves trailing
   spaces at each line's end.
+- when capturing whole history, do not guess its size, but get it from
+  `#{history_limit}` format flag
 
 ### v2.0.0, 2015-03-14
 - update readme

scripts/capture_pane_helpers.sh

@@ -18,8 +18,8 @@ capture_pane() {
 	local file="$(get_path)/$(get_filename)"
 	local capture_scope=$1
 	if [ $capture_scope == "History" ]; then
-		# copying 9M lines back will hopefully fetch the whole scrollback
-		tmux capture-pane -J -S -9000000 -p > "$file"
+		local history_limit="$(tmux display-message -p -F "#{history_limit}")"
+		tmux capture-pane -J -S "-${history_limit}" -p > "$file"
 	elif [[ $capture_scope == "Screen capture" ]]; then
 		tmux capture-pane -J -p > "$file"
 	else