From 1c8064ebf057e956b4d873fdaccaecbb4f67ca88 Mon Sep 17 00:00:00 2001
From: Tomas Mirchev <contact@tomastm.com>
Date: Mon, 3 Nov 2025 08:04:08 +0200
Subject: [PATCH] init

---
 parse_image_ref.sh | 110 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 parse_image_ref.sh

diff --git a/parse_image_ref.sh b/parse_image_ref.sh
new file mode 100644
index 0000000..0cd5f31
--- /dev/null
+++ b/parse_image_ref.sh
@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+# parse_image_ref.sh
+
+DEFAULT_REGISTRY="registry.tm0.app"
+DEFAULT_TAG="latest"
+
+parse_image_ref() {
+  local input="$1"
+
+  local image_ref registry repo tag label
+
+  if [[ $input == */* ]]; then
+    local prefix="${input%%/*}"
+    if [[ "$prefix" == "docker" ]]; then
+      input="docker.io/library/${input#*/}"
+    elif [[ "$prefix" == "tm0" ]]; then
+      input="${DEFAULT_REGISTRY}/${input#*/}"
+    fi
+
+    registry="${input%%/*}"
+    input=${input#*/}
+  else
+    registry="$DEFAULT_REGISTRY"
+  fi
+
+  if [[ "${input##*/}" == *:* ]]; then
+    tag="${input##*:}"
+    input="${input%:*}"
+  else
+    tag="$DEFAULT_TAG"
+  fi
+
+  repo="${registry}/${input}"
+  repo="${repo#*/}"
+  image_ref="${registry}/${repo}:${tag}"
+
+  label="${registry%.*}"
+  label="${label##*.}/${repo##*/}"
+
+  echo "$image_ref $repo $tag $label"
+}
+
+# -------------------------------------------------------------------
+# Test harness
+# -------------------------------------------------------------------
+test_case() {
+  local input="$1"
+  local expected="$2"
+  local output
+  output="$(parse_image_ref "$input")"
+
+  if [[ "$output" == "$expected" ]]; then
+    printf "✅ PASS: %-35s => %s\n" "$input" "$output"
+  else
+    printf "❌ FAIL: %-35s\n" "$input"
+    printf "   expected: %s\n" "$expected"
+    printf "   got:      %s\n" "$output"
+  fi
+}
+
+run_tests() {
+  echo "Running test cases..."
+  echo
+
+  test_case "tm0/nginx" \
+    "registry.tm0.app/nginx:latest nginx latest tm0/nginx"
+
+  test_case "tm0/dev/api" \
+    "registry.tm0.app/dev/api:latest dev/api latest tm0/api"
+
+  test_case "registry.tm0.app/nginx" \
+    "registry.tm0.app/nginx:latest nginx latest tm0/nginx"
+
+  test_case "registry.tm0.app:2525/nginx" \
+    "registry.tm0.app:2525/nginx:latest nginx latest tm0/nginx"
+
+  test_case "registry.tm0.app/dev/api" \
+    "registry.tm0.app/dev/api:latest dev/api latest tm0/api"
+
+  test_case "a.b.c.registry.tm0.app/dev/api" \
+    "a.b.c.registry.tm0.app/dev/api:latest dev/api latest tm0/api"
+
+  test_case "docker/nginx" \
+    "docker.io/library/nginx:latest library/nginx latest docker/nginx"
+
+  test_case "docker/nginx:1.25" \
+    "docker.io/library/nginx:1.25 library/nginx 1.25 docker/nginx"
+
+  test_case "docker.io/library/nginx:1.25" \
+    "docker.io/library/nginx:1.25 library/nginx 1.25 docker/nginx"
+
+  test_case "docker/redis" \
+    "docker.io/library/redis:latest library/redis latest docker/redis"
+
+  test_case "custom-registry.io/team/api:2.3.1" \
+    "custom-registry.io/team/api:2.3.1 team/api 2.3.1 custom-registry/api"
+
+  test_case "custom-registry.io:2525/team/api:2.3.1" \
+    "custom-registry.io:2525/team/api:2.3.1 team/api 2.3.1 custom-registry/api"
+
+  test_case "custom-registry.io:2525/api:2.3.1" \
+    "custom-registry.io:2525/api:2.3.1 api 2.3.1 custom-registry/api"
+
+  test_case "custom-registry.io/app" \
+    "custom-registry.io/app:latest app latest custom-registry/app"
+}
+
+if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
+  run_tests
+fi