Consolidate

do

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
+set -o errexit -o nounset -o pipefail
 
-source .plsdo.sh
+declare -A help
 
 binary() {
     mkdir -p dist
@@ -13,18 +14,7 @@ binary-static() {
 }
 
 update-golden() {
-    #_update-golden
-    if ldd ./dist/gotestsum > /dev/null 2>&1; then
-        binary-static
-    fi
-    GOLANG_VERSION=1.13-alpine ./do shell ./do _update-golden
-    GOLANG_VERSION=1.14.6-alpine ./do shell ./do _update-golden
-}
-
-_update-golden() {
-    PATH="$PWD/dist:$PATH" gotestsum -- \
-        ./cmd ./testjson ./internal/junitxml ./cmd/tool/slowest \
-        -test.update-golden
+    gotestsum -- ./... -update
 }
 
 lint() {
@@ -83,4 +73,38 @@ godoc() {
     command godoc -http=:6060
 }
 
+help[list]="Print the list of tasks"
+list() {
+    declare -F | awk '{print $3}' | grep -v '^_'
+}
+
+_plsdo_help() {
+    local topic="${1-}"
+    # print help for the topic
+    if [ -n "$topic" ]; then
+        if ! command -v "$topic" > /dev/null ; then
+            >&2 echo "No such task: $topic"
+            return 1
+        fi
+
+        printf "\nUsage:\n  %s %s\n\n%s\n" "$0" "$topic" "${help[$topic]-}"
+        return 0
+    fi
+
+    # print list of tasks and their help line.
+    [ -n "${banner-}" ] && echo "$banner" && echo
+    for i in $(list); do
+        printf "%-12s\t%s\n" "$i" "${help[$i]-}" | head -1
+    done
+}
+
+_plsdo_run() {
+    case "${1-}" in
+    ""|help)
+        _plsdo_help "${2-}" ;;
+    *)
+        "$@" ;;
+    esac
+}
+
 _plsdo_run "$@"