Check for empty or whitespace PROMPT_COMMAND before appending preexec_invoke_cmd

2016-08-04 15:51:15 -05:00
parent 6060c87178
commit 3b56275ef6
1 changed files with 5 additions and 1 deletions
--- a/lib/preexec.bash
+++ b/lib/preexec.bash
@@ -122,7 +122,11 @@ function preexec_install () {
    shopt -s extdebug > /dev/null 2>&1

    # Finally, install the actual traps.
-    PROMPT_COMMAND="${PROMPT_COMMAND};preexec_invoke_cmd"
+    if [[ ! -z "${PROMPT_COMMAND// }" ]]; then
+      PROMPT_COMMAND="${PROMPT_COMMAND};preexec_invoke_cmd"
+    else
+      PROMPT_COMMAND="preexec_invoke_cmd"
+    fi
    trap 'preexec_invoke_exec' DEBUG
 }