From 5454b1ff7cfe1c2e8ebf081f2cdd51fb1e586cf4 Mon Sep 17 00:00:00 2001
From: Martin Winkler <efelon@winklerfamilie.eu>
Date: Tue, 10 May 2022 23:52:56 +0200
Subject: [PATCH] sequencer - Log function able to write to stderr

---
 sequencer.sh | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/sequencer.sh b/sequencer.sh
index 41a8799..7bafba3 100755
--- a/sequencer.sh
+++ b/sequencer.sh
@@ -59,7 +59,7 @@ set -o pipefail
   col_off= ;[ -t 1 ] && col_off='\033[0m' # No Color
 }
 
-# Logging
+## Logging
 {
   LOG_LEVEL="${LOG_LEVEL:-3}" # 4 = debug -> 0 = fatal (stop)
   LOG_TIME="${LOG_TIME:-}"    # 1 = show time stamps
@@ -70,6 +70,7 @@ set -o pipefail
   #  [OPTIONS]
   #    -a  :  append text (no info and timestamp)
   #           Uses color from last sqr::log call without -a
+  #    -e  :  Output to stderr
   #    --  :  End of options
   #
   sqr::log () {
@@ -77,6 +78,7 @@ set -o pipefail
     local appendText=
     local arg=
     local col_end="${col_off}"
+    local outp='/dev/stdout'
 
     local log_level="${1:-}"
     shift
@@ -89,6 +91,9 @@ set -o pipefail
         -a)
           appendText=1 
           shift ;;
+        -e)
+          outp='/dev/stderr'
+          shift ;;
       esac
     done
 
@@ -98,24 +103,25 @@ set -o pipefail
     local log_line=""
 
     while IFS=$'\n' read -r log_line ; do
-      printf '%b' "${log_color}"
+      color red
+      printf '%b' "${log_color}" >${outp}
       if [[ -n "${LOG_TIME}" ]] ; then
         if (( appendText )) ; then
-          printf '%24s' ""
+          printf '%24s' "" >${outp}
         else
-          printf '%s ' "$(date -u +"%Y-%m-%d %H:%M:%S UTC")"
+          printf '%s ' "$(date -u +"%Y-%m-%d %H:%M:%S UTC")" >${outp}
         fi
       fi
 
       if (( ! appendText )) ; then
-        printf " %3s " "[${log_level}]" 
-        printf "%s" "${log_line}" # 1>&2 # send to stderr
+        printf " %3s " "[${log_level}]" >${outp} 
+        printf "%s" "${log_line}" >${outp}
       else
         # +3 : "[] "
-        printf "%$((${#log_level} + 4))s%s" "" "${log_line}"
+        printf "%$((${#log_level} + 4))s%s" "" "${log_line}" >${outp}
       fi
 
-      printf '%b\n' "${col_end}" 
+      printf '%b\n' "${col_end}" >${outp}
     done <<< "${@:-}"
     sqr::debugContinue
   }
@@ -186,7 +192,7 @@ set -o pipefail
   }
 }
 
-# Traps
+## Traps
 {
   sqr::trap_exit () {
     exists -f seq_trapExit && seq_trapExit
@@ -338,6 +344,7 @@ ask() {
     answer="${2:-}"
   fi
   printf '%s\n' "${answer}"
+
   # return if answer is empty
   sqr::debugContinue
   if (( ! empty )) ; then
@@ -345,6 +352,7 @@ ask() {
   fi
 }
 
+# exe <COMMAND>
 # Handle dry run and verbose output for commands without pipe and/or redirects
 exe() {
   dry && printf -- '--'
@@ -357,8 +365,8 @@ exe() {
   fi
 }
 
-# Handle dry run and verbose output for commands containing pipe and/or redirects
 # exep <COMMAND AS STRING(S)>
+# Handle dry run and verbose output for commands containing pipe and/or redirects
 exep() {
   if dry ; then
     printf -- '--++ : %s\n' "$*"
@@ -409,3 +417,4 @@ sqr::main() {
 }
 
 sqr::main "$@"
+