Add colorful PS4

PS4 can include functions, so when running in the LOG_COLORS=True mode
provide a grey function line so that it's easier to visually
distinguish the content from the location.

Also make it so the main prompt chunks off all the common path, which
means we can printf to 40 characters and have a pretty reasonable and
readable PS4.

Change-Id: I4a10a49db97d413349bcfceeb8c4164936fbcc40

functions

@@ -30,6 +30,19 @@ function function_exists {
     declare -f -F $1 > /dev/null
 }
 
+# short_source prints out the current location of the caller in a way
+# that strips redundant directories. This is useful for PS4 usage.
+function short_source {
+    saveIFS=$IFS
+    IFS=" "
+    called=($(caller 0))
+    IFS=$saveIFS
+    file=${called[2]}
+    file=${file#$RC_DIR/}
+    printf "%-40s " "$file:${called[1]}:${called[0]}"
+}
+
+
 # Retrieve an image from a URL and upload into Glance.
 # Uses the following variables:
 #

stackrc

@@ -14,9 +14,6 @@ unset LANGUAGE
 LC_ALL=C
 export LC_ALL
 
-# Make tracing more educational
-export PS4='+ ${BASH_SOURCE:-}:${FUNCNAME[0]:-}:L${LINENO:-}:   '
-
 # Find the other rc files
 RC_DIR=$(cd $(dirname "${BASH_SOURCE:-$0}") && pwd)
 
@@ -132,6 +129,16 @@ elif [[ -f $RC_DIR/.localrc.auto ]]; then
     source $RC_DIR/.localrc.auto
 fi
 
+# Use color for logging output (only available if syslog is not used)
+LOG_COLOR=$(trueorfalse True LOG_COLOR)
+
+# Make tracing more educational
+if [[ "$LOG_COLOR" == "True" ]]; then
+    export PS4='+\[$(tput setaf 242)\]$(short_source)\[$(tput sgr0)\] '
+else
+    export PS4='+ $(short_source):   '
+fi
+
 # Configure Identity API version: 2.0, 3
 IDENTITY_API_VERSION=${IDENTITY_API_VERSION:-2.0}
 
@@ -785,9 +792,6 @@ SYSLOG=$(trueorfalse False SYSLOG)
 SYSLOG_HOST=${SYSLOG_HOST:-$HOST_IP}
 SYSLOG_PORT=${SYSLOG_PORT:-516}
 
-# Use color for logging output (only available if syslog is not used)
-LOG_COLOR=$(trueorfalse True LOG_COLOR)
-
 # Set global ``GIT_DEPTH=<number>`` to limit the history depth of the git clone
 # Set to 0 to disable shallow cloning
 GIT_DEPTH=${GIT_DEPTH:-0}

tools/create_userrc.sh

@@ -7,6 +7,22 @@
 # Warning: This script just for development purposes
 
 set -o errexit
+
+# short_source prints out the current location of the caller in a way
+# that strips redundant directories. This is useful for PS4
+# usage. Needed before we start tracing due to how we set
+# PS4. Normally we'd pick this up from stackrc, but that's not sourced
+# here.
+function short_source {
+    saveIFS=$IFS
+    IFS=" "
+    called=($(caller 0))
+    IFS=$saveIFS
+    file=${called[2]}
+    file=${file#$RC_DIR/}
+    printf "%-40s " "$file:${called[1]}:${called[0]}"
+}
+
 set -o xtrace
 
 ACCOUNT_DIR=./accrc

tools/install_pip.sh

@@ -11,7 +11,6 @@
 # - if USE_PYTHON3=True, PYTHON3_VERSION refers to a version already installed
 
 set -o errexit
-set -o xtrace
 
 # Keep track of the current directory
 TOOLS_DIR=$(cd $(dirname "$0") && pwd)
@@ -23,6 +22,9 @@ cd $TOP_DIR
 # Import common functions
 source $TOP_DIR/stackrc
 
+# don't start tracing until after we've sourced the world
+set -o xtrace
+
 FILES=$TOP_DIR/files
 
 PIP_GET_PIP_URL=https://bootstrap.pypa.io/get-pip.py