ci: Optimize CI/CD workflows and add changelog generation script

.github/scripts/changelog.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Resolve the previous nightly tag position for incremental changelog.
+# Falls back to the latest stable (v*) tag if nightly tag does not exist.
+prev_sha=""
+compare_base=""
+
+if git rev-parse nightly >/dev/null 2>&1; then
+    prev_sha=$(git rev-parse nightly)
+fi
+
+if [ -n "$prev_sha" ] && [ "$prev_sha" != "$GITHUB_SHA" ]; then
+    compare_base="$prev_sha"
+else
+    last_tag=$(git describe --tags --abbrev=0 --match='v*' 2>/dev/null || true)
+    if [ -n "$last_tag" ]; then
+        compare_base="$last_tag"
+    fi
+fi
+
+if [ -n "$compare_base" ]; then
+    changelog=$(git log --pretty=format:"- %s (%h)" "${compare_base}..HEAD")
+    compare_url="https://github.com/${GITHUB_REPOSITORY}/compare/${compare_base}...${GITHUB_SHA}"
+else
+    changelog="- Initial nightly build"
+    compare_url=""
+fi
+
+{
+    echo "body<<BODY_EOF"
+    echo "## Nightly \`${SHORT_SHA}\`"
+    echo ""
+    echo "**Date:** $(date -u '+%Y-%m-%d %H:%M UTC')"
+    echo "**Commit:** ${GITHUB_SHA}"
+    [ -n "$compare_url" ] && echo "**Changes:** [compare](${compare_url})"
+    echo ""
+    echo "### What's Changed"
+    echo "$changelog"
+    echo "BODY_EOF"
+} >> "$GITHUB_OUTPUT"

.github/templates/start.bat.in

@@ -9,4 +9,8 @@ if errorlevel 1 (
 )
 
 java -jar packwiz-installer-bootstrap.jar -g -s server "@PACK_URL@"
+if errorlevel 1 (
+  echo Pack update failed.
+  exit /b 1
+)
 java -jar "@FORGE_JAR@" nogui

.github/workflows/nightly.yml

@@ -4,6 +4,13 @@ on:
   push:
     branches:
       - 'main'
+    paths-ignore:
+      - 'docs/**'
+      - 'README.md'
+      - 'LICENSE'
+      - 'NOTICE.md'
+      - 'CLAUDE.md'
+      - '.github/ISSUE_TEMPLATE/**'
 
 env:
   MANIFEST_REPO: GregTechLite/gregtechlite.github.io
@@ -29,7 +36,13 @@ jobs:
           ref: ${{ github.ref_name }}
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31
+        uses: nixbuild/nix-quick-install-action@v34
+
+      - name: Cache Nix store
+        uses: nix-community/cache-nix-action@v7
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
 
       - name: Load devShell
         uses: rrbutani/use-nix-shell-action@v1
@@ -62,6 +75,10 @@ jobs:
           user_email: 'github-actions[bot]@users.noreply.github.com'
           commit_message: "Nightly ${{ env.SHORT_SHA }}"
 
+      - name: Generate changelog
+        id: changelog
+        run: bash .github/scripts/changelog.sh
+
       - name: Update nightly tag
         run: |
           git tag -f nightly
@@ -72,13 +89,14 @@ jobs:
         with:
           tag: nightly
           name: Nightly ${{ env.SHORT_SHA }}
+          body: ${{ steps.changelog.outputs.body }}
           prerelease: true
           artifacts: |
             ${{ steps.package.outputs.curseforge_zip }}
             ${{ steps.package_server.outputs.server_zip }}
           allowUpdates: true
           updateOnlyUnreleased: true
-          generateReleaseNotes: true
+          removeArtifacts: true
 
       - name: Upload nightly artifacts
         uses: actions/upload-artifact@v4
@@ -87,4 +105,5 @@ jobs:
           path: |
             ${{ steps.package.outputs.curseforge_zip }}
             ${{ steps.package_server.outputs.server_zip }}
+          retention-days: 7
           if-no-files-found: error

.github/workflows/pr.yml

@@ -0,0 +1,65 @@
+name: PR Build
+
+on:
+  pull_request:
+    branches:
+      - 'main'
+    paths-ignore:
+      - 'docs/**'
+      - 'README.md'
+      - 'LICENSE'
+      - 'NOTICE.md'
+      - 'CLAUDE.md'
+      - '.github/ISSUE_TEMPLATE/**'
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install Nix
+        uses: nixbuild/nix-quick-install-action@v34
+
+      - name: Cache Nix store
+        uses: nix-community/cache-nix-action@v7
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
+
+      - name: Load devShell
+        uses: rrbutani/use-nix-shell-action@v1
+        with:
+          devShell: .#default
+
+      - name: Resolve metadata
+        run: bash .github/scripts/meta.sh
+
+      - name: Package client
+        id: package
+        run: bash .github/scripts/client.sh "${SLUG}-pr${{ github.event.pull_request.number }}-${SHORT_SHA}"
+
+      - name: Package server
+        id: package_server
+        run: bash .github/scripts/server.sh "${SLUG}-pr${{ github.event.pull_request.number }}-${SHORT_SHA}" "https://raw.githubusercontent.com/${{ github.event.pull_request.head.repo.full_name }}/${{ github.event.pull_request.head.sha }}/pack.toml"
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: "${{ env.SLUG }}-pr${{ github.event.pull_request.number }}-${{ env.SHORT_SHA }}"
+          path: |
+            ${{ steps.package.outputs.curseforge_zip }}
+            ${{ steps.package_server.outputs.server_zip }}
+          retention-days: 3
+          if-no-files-found: error

.github/workflows/release.yml

@@ -29,7 +29,13 @@ jobs:
           ref: ${{ github.ref_name }}
 
       - name: Install Nix
-        uses: cachix/install-nix-action@v31
+        uses: nixbuild/nix-quick-install-action@v34
+
+      - name: Restore Nix store cache
+        uses: nix-community/cache-nix-action/restore@v7
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
 
       - name: Load devShell
         uses: rrbutani/use-nix-shell-action@v1

.packwizignore

@@ -54,3 +54,7 @@ flake.lock
 
 # GitHub
 /.github/
+
+# Claude
+CLAUDE.md
+/.claude/

CLAUDE.md

@@ -0,0 +1,96 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+GregTech Lite (GTLite) is a Minecraft 1.12.2 Forge modpack centered around GregTech CE Unofficial (GTCEu). It uses **PackWiz** for mod management and distribution, **GroovyScript** for recipe customization, and **BetterQuesting** for progression.
+
+- Pack metadata: `pack.toml` (name, version, Minecraft/Forge versions)
+- File manifest: `index.toml` (SHA256 hashes of all packed files)
+- Mod definitions: `mods/*.pw.toml` (PackWiz metadata referencing CurseForge)
+- Three local JARs in `mods/`: `gregtech-*.jar` (GTCEu), `gtlitecore-*.jar` (custom core mod), `morphismlib-*.jar` (dependency library)
+
+## Development Environment
+
+Requires Nix. Enter the dev shell with:
+```bash
+nix develop
+```
+This provides: JDK 8, tomlq (yq), packwiz, zip.
+
+## Common Commands
+
+```bash
+# Export CurseForge client package
+packwiz curseforge export -o dist/output.zip
+
+# Add a mod from CurseForge
+packwiz curseforge install <mod-slug>
+
+# Update a mod
+packwiz update <mod-name>
+
+# Refresh index.toml after file changes
+packwiz refresh
+```
+
+## Architecture
+
+### GroovyScript Recipes (`groovy/`)
+
+Recipe loading is configured in `groovy/runConfig.json` with two phases:
+- **preInit**: `event/` (MaterialEventHandler, TooltipEventHandler), `util/` (GroovyUtil)
+- **postInit**: `loader/` — OreDictionaryLoader, `loader/hooks/`, `loader/recipe/`
+
+Each file in `loader/recipe/` handles recipe modifications for a specific mod (e.g., `AppliedEnergistics2.groovy`, `EnderIO.groovy`, `GregTech.groovy`). All recipes are redesigned to follow GregTech's philosophy.
+
+**Recipe syntax patterns:**
+- Machine recipes: `recipemap('assembler').recipeBuilder().inputs(...).outputs(...).duration(...).EUt(VA[LV]).buildAndRegister()`
+- Crafting: `crafting.addShapeless(...)`, `crafting.shapedBuilder(...).key(...).build()`
+- Item references: `metaitem('circuit.good')`, `ore('plateSteel')`, `item('minecraft:stone')`, `fluid('water')`
+- Energy tiers: `VA[ULV]` through `VA[MAX]`, duration constants like `SECOND`
+
+### Quest System (`config/betterquesting/DefaultQuests/`)
+
+- `QuestLines/*.json` — Quest line definitions (20 lines covering LV through MAX voltage tiers)
+- `Quests/<questline-id>/<quest-id>.json` — Individual quest data
+
+Quest JSON uses a NBT-like format with type suffixes: `:2` = short, `:3` = int, `:7` = byte array, `:8` = string, `:9` = tag list, `:10` = compound tag, `:11` = int array.
+
+### Config (`config/`)
+
+Mod configuration files. Key ones:
+- `gregtech/gregtech.cfg` — GregTech balance and features
+- `AppliedEnergistics2/AppliedEnergistics2.cfg` — AE2 settings
+- `betterquesting.cfg` — Quest UI and behavior
+
+### Resources (`resources/`)
+
+Resource pack overrides: custom textures, lang files, and JEI integration. Organized by mod namespace (e.g., `gregtech/`, `appliedenergistics2/`, `minecraft/`).
+
+## CI/CD
+
+Three GitHub Actions workflows (all use Nix dev shell):
+
+- **pr.yml** ("PR Build"): Triggered on PRs to `main`. Ignores docs-only changes. Uses PR number and short SHA in artifact names (e.g., `gregtech-lite-pr42-a1b2c3d-curseforge.zip`). Concurrency groups by PR number to cancel stale builds. 3-day artifact retention.
+- **nightly.yml**: Triggered on push to `main` (+ `workflow_dispatch`). Builds artifacts, deploys manifest to `GregTechLite/gregtechlite.github.io` under `nightly/`, generates changelog from git history, force-updates `nightly` tag, publishes prerelease. 7-day artifact retention.
+- **release.yml**: Triggered by `v*` tags. Validates tag matches `pack.toml` version, builds artifacts, deploys manifest to `releases/{VERSION}/`, publishes GitHub Release.
+
+### Build Scripts (`.github/scripts/`)
+
+- `meta.sh` — Extracts metadata from `pack.toml` via `tomlq` and exports to `$GITHUB_ENV`: `NAME`, `SLUG`, `VERSION`, `MINECRAFT_VERSION`, `FORGE_VERSION`, `SHORT_SHA`
+- `client.sh` — Runs `packwiz curseforge export` into `dist/`
+- `server.sh` — Downloads Forge installer + packwiz-installer-bootstrap, runs Forge install, generates start scripts from `.github/templates/` (`start.sh.in`, `start.bat.in`, `eula.txt`, `README.txt.in`), creates server ZIP
+- `manifest.sh` — Copies `pack.toml`, `index.toml`, and all indexed files to `dist/manifest/` for deployment
+- `changelog.sh` — Generates incremental nightly changelog by diffing from previous `nightly` tag or latest `v*` tag
+
+## File Exclusions
+
+`.packwizignore` excludes development-only files (docs/, .github/, flake.nix, CLAUDE.md, logo.png, IDE metadata, etc.) from pack exports. Only game-relevant files ship to players.
+
+## Licensing
+
+- Modpack code: GNU AGPL 3.0
+- Assets: CC BY-NC-SA 3.0
+- Questbook content: CC BY-NC-ND 3.0