feat(legacy): +writeDash +helpers

legacy/helper/posix-shell/log.sh

@@ -0,0 +1,21 @@
+#!/bin/dash
+
+log() {
+    level="${1:?}"; shift
+    case "$level" in
+        trace)   color="$MAGENTA"  ;;
+        debug)   color="$BLUE"     ;;
+        info)    color="$GREEN"    ;;
+        notice)  color="$CYAN"     ;;
+        warn)    color="$YELLOW"   ;;
+        error)   color="$RED"      ;;
+        *)       color="$WHITE"    ;;
+    esac
+
+
+
+    # shellcheck disable=SC1003
+    fmt="$(printf "%s" "${1:?}" | sed 's/\\033\[0m/''\'"$color"'/g')"
+    shift
+    printf "%b\n" "$color$fmt$NC" "$@" >&2
+}