Add verbose output option: -v.

Three levels of verbosity are provided from simple unexpanded commands to
full set -x output.

Change-Id: I04f14e15a138690468dba76f98f6e8cccd94c838

1 files changed, 26 insertions, 2 deletions

diff --git a/tcwg-release.sh b/tcwg-release.sh
index 6fa7e9f..2b41a20 100755
--- a/tcwg-release.sh
+++ b/tcwg-release.sh
@@ -17,7 +17,7 @@ usage() {
     cat << EOF
   ${release_script} [-a FILE] [-b BRANCH] [-d DATE] [-h] [-e REMOTE]
                   [-f FILESERVER] [-n] [-r [RC] [SPIN]] [-R [SPIN]] [-S [SPIN]]
-                  [-t TAG]  [-u]
+                  [-t TAG] [-u] [-v]
 EOF
     return 0
 }
@@ -185,6 +185,10 @@ ${bold}OPTIONS${NC}"
                 and not use a TAG.  Using -t with -b is not allowed since
                 -t and -b are both aliases for a single commit.
 
+  -v
+                Emit verbose output.  Use more than once to increase output
+                further.
+
   -u
 EOF
 echo -e "\
@@ -332,9 +336,15 @@ die() {
 }
 
 handle_ctrl_c() {
+    # set -x is not well handled by trap and cleanup, so turning it off.
+    (( VERBOSITY >= 2 )) && set +x
     clean_and_die "User hit ctrl-c.  Operation aborted."
 }
 
+debug_handler() {
+    echo "$BASH_COMMAND" | grep -v "echo\|ask\|print\|exec\|eval\|\[\|\]"
+}
+
 # arg1: a date in any format
 # print a sanitized version of the date, or the error
 # as generated by `date` if the input is invalid.  The
@@ -542,6 +552,7 @@ hint() {
 dirs -c
 
 GIT_REPO="$PWD"
+VERBOSITY=0
 
 # Leave these unset by default!
 SPIN=
@@ -561,7 +572,7 @@ release_script="$(basename "$0")"
 
 # Arguments.  The first colon puts getopts into silent error reporting mode
 # which sets $OPTARG to the unknown option if one is encountered.
-while getopts ":a:b:d:e:f:hnrRSt:u" options
+while getopts ":a:b:d:e:f:hnrRSt:uv" options
 do
     case $options in
 	a ) gitlog_amend="--amend $OPTARG"
@@ -613,6 +624,8 @@ do
 	    ;;
 	u ) extended_usage; exit 1;
 	    ;;
+	v ) (( VERBOSITY=VERBOSITY+1 ))
+	    ;;
 	\?) print_info "Option -${BOLD}$OPTARG${NC} Unsupported."
 	    ;;
 	: ) extended_usage; die "Option \"-$OPTARG\" requires an argument."
@@ -672,6 +685,17 @@ if [[ "${TAG:+t}" = "t" && "${BRANCH:+b}" = "b" ]]; then
     die "Using -t and -b together is not allowed."
 fi
 
+# Handle verbosity mode
+if (( VERBOSITY == 1 )); then
+    trap "debug_handler" DEBUG;
+elif (( VERBOSITY == 2 )); then
+    exec 4> >( grep -v "^++\|echo\|ask\|print\|exec\|eval\|\[\|\]" >&2)
+    BASH_XTRACEFD=4
+    set -x;
+elif (( VERBOSITY >= 3 )); then
+    set -x;
+fi
+
 # Track either the BRANCH or the TAG
 track="${BRANCH:+${BRANCH}}${TAG:+${TAG}}"