Updated the err file

1 files changed, 11 insertions, 8 deletions

diff --git a/err b/err
index 5b501ce..97b3cc3 100755
--- a/err
+++ b/err
@@ -14,7 +14,6 @@
 # limitations under the License.
 
 
-
 # Commentary: Bash stack trace and error handling functions. This file
 # is meant to be sourced. It loads some functions which you may want to
 # call manually (see the comments at the start of each one), and then
@@ -24,6 +23,7 @@ err-allow() {
   # help: turn off exit and stack trace on error. undoes err-catch
   set +E +o pipefail; trap ERR
 }
+
 err-bash-trace() {
   # help: print stack trace
   #
@@ -46,7 +46,7 @@ err-bash-trace() {
     fi
     indent=$((frame-start+1))
     indent=$((indent < max_indent ? indent : max_indent))
-    printf "%${indent}s↳%sin \`%s" '' "$source" "${FUNCNAME[frame]}"
+    printf "%${indent}s↳%sin \`%s" '' "$source" "${FUNCNAME[frame]}"
     if $extdebug; then
       for ((i=argc_index-1; i >= argc_index-argc; i--)); do
         printf " %s" "${BASH_ARGV[i]}"
@@ -55,10 +55,11 @@ err-bash-trace() {
     echo \'
   done
 }
+
 err-catch() {
-  # help: print stack trace and exit on error.
+  # help: on errors: print stack trace and exit
   #
-  # Set "${_errcatch_cleanup[@]}" to set a command which will run before exiting.
+  # You can set "${_errcatch_cleanup[@]}" to a command and it will run before exiting.
   # This function depends on err-bash-trace.
 
   set -E; shopt -s extdebug
@@ -69,13 +70,14 @@ err-catch() {
     echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}:in \`$BASH_COMMAND' returned $err"
     # err trap does not work within an error trap, the following line:
     err-bash-trace 2; set -e
-    "${_errcatch_cleanup[@]}"
+    "${_errcatch_cleanup[@]:-}" # note :- is to be compatible with set -u
     echo "$0: exiting with code $err"
     exit $err
   }
   trap _err-trap ERR
   set -o pipefail
 }
+
 err-exit() {
   # usage: err-exit [EXIT_CODE] [MESSAGE]
   # help: exit and print stack trace.
@@ -87,14 +89,14 @@ err-exit() {
 
   exec >&2
   code=1
-  if [[ $* ]]; then
+  if [[ "$*" ]]; then
     if [[ ${1/[^0-9]/} == "$1" ]]; then
       code=$1
       if [[ $2 ]]; then
-        printf "%s\n" "$2"
+        printf '%s\n' "$2"
       fi
     else
-      printf "%s\n" "$0: $1"
+      printf '%s\n' "$0: $1"
     fi
   fi
   echo "${BASH_SOURCE[1]}:${BASH_LINENO[0]}"
@@ -102,4 +104,5 @@ err-exit() {
   echo "$0: exiting with code $code"
   exit $err
 }
+
 err-catch