@@ -135,12 +135,29 @@ elif [[ -f $RC_DIR/.localrc.auto ]]; then

     source $RC_DIR/.localrc.auto

 fi

+# Default for log coloring is based on interactive-or-not.

+# Baseline assumption is that non-interactive invocations are for CI,

+# where logs are to be presented as browsable text files; hence color

+# codes should be omitted.

+# Simply override LOG_COLOR if your environment is different.

+if [ -t 1 ]; then

+    _LOG_COLOR_DEFAULT=True

+else

+    _LOG_COLOR_DEFAULT=False

+fi

+

 # Use color for logging output (only available if syslog is not used)

-LOG_COLOR=$(trueorfalse True LOG_COLOR)

+LOG_COLOR=$(trueorfalse $_LOG_COLOR_DEFAULT LOG_COLOR)

 # Make tracing more educational

 if [[ "$LOG_COLOR" == "True" ]]; then

-    export PS4='+\[$(tput setaf 242)\]$(short_source)\[$(tput sgr0)\] '

+    # tput requires TERM or -T.  If neither is present, use vt100, a

+    # no-frills least common denominator supported everywhere.

+    TPUT_T=

+    if ! [ $TERM ]; then

+        TPUT_T='-T vt100'

+    fi

+    export PS4='+\[$(tput '$TPUT_T' setaf 242)\]$(short_source)\[$(tput '$TPUT_T' sgr0)\] '

 else

     export PS4='+ $(short_source):   '

 fi