Add bash trap article

content/articles/2022/bash_les_pieges/files/message.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+DATE_FMT="+%s"
+
+msg() {
+  local message="$*"
+  [ -z "$message" ] && return
+  if [ -t 1 ]
+  then
+    printf "%b\n" "$message"
+  else
+    log "$message"
+  fi
+}
+
+log() {
+   local message="${*-}"
+   [ -z "$message" ] && return
+   printf "%s %b\n" "$(date $DATE_FMT)" "$message"
+}
+
+debug() {
+  local message="$*"
+  [[ -z $DEBUG || $DEBUG -ne 1 ]] && return 
+  [ -z "$message" ] && return
+  message="DEBUG [${BASH_SOURCE[1]}:${FUNCNAME[1]}]: $message"
+  if [ -t 2 ]
+  then
+    >&2 msg "\e[34m$message\e[0m"
+  else
+    >&2 log "$message"
+  fi
+}
+
+error() {
+  local message="$*"
+  [ -z "$message" ] && return 
+  message="ERROR: $message"
+  if [[ -n $DEBUG && $DEBUG -eq 1 ]]
+  then
+    message="$message\n\tstack trace:\n"
+    for (( i=1; i<${#FUNCNAME[@]}; i++ ))
+    do
+      message="${message}\t  source:${BASH_SOURCE[i]}"
+      message="${message} function:${FUNCNAME[$i]}"
+      message="${message} line:${BASH_LINENO[$i-1]}\n" 
+    done
+  fi
+  if [ -t 2 ]
+  then
+    >&2 msg "\e[31m$message\e[0m"
+  else
+    >&2 log "$message"
+  fi
+}