Add workflow to create source releases (#563)

- add release workflow to generate source archives
- add workflow and script to automatically create single source file

.github/workflows/release.yml

@@ -0,0 +1,129 @@
+name: Release
+
+on:
+  push:
+  pull_request:
+  release:
+    types: [published]
+
+jobs:
+  source-archive:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        format: [zip]
+    env:
+      FORMAT: ${{ matrix.format }}
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Get version number
+      run: |
+        VERSION=$(git describe --tags --match 'v*' --always | tr -d 'v')
+        echo "VERSION=${VERSION}" >> $GITHUB_ENV
+
+    - name: Create archive
+      run: |
+        echo "OUTPUT=${{ env.OUTPUT }}" >> $GITHUB_ENV
+        git archive --prefix ${{ env.PREFIX }} --format ${{ env.FORMAT }} HEAD > ${{ env.OUTPUT }}
+      env:
+        OUTPUT: fpm-${{ env.VERSION }}.${{ env.FORMAT }}
+        PREFIX: fpm-${{ env.VERSION }}/
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: ${{ env.OUTPUT }}
+        path: ${{ env.OUTPUT }}
+
+  source-single-file:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Get version number
+      run: |
+        VERSION=$(git describe --tags --match 'v*' --always | tr -d 'v')
+        echo "VERSION=${VERSION}" >> $GITHUB_ENV
+
+    # Note: this step is meant to remove the test targets from the package manifest,
+    #       a change in the package manifest might require to regenerate the patch file.
+    - name: Remove tests
+      run: |
+        patch -p1 < ./ci/single-file.patch
+
+    - name: Install fpm
+      uses: fortran-lang/setup-fpm@v3
+      with:
+        fpm-version: 'v0.4.0'
+
+    - name: Create single file version
+      run: |
+        echo "OUTPUT=${{ env.OUTPUT }}" >> $GITHUB_ENV
+        echo "#define FPM_BOOTSTRAP" > fpm-${{ env.VERSION }}.F90
+        fpm build --compiler ./ci/single-file-gfortran.sh
+      env:
+        OUTPUT: fpm-${{ env.VERSION }}.F90
+        OMP_NUM_THREADS: 1
+
+    # Building the bootstrap version from the single source version is the most expensive
+    # step in this workflow, since we have to compile several thousand lines of source.
+    - name: Build single source version
+      run: |
+        echo "EXE=${{ env.BUILD_DIR }}/fpm" >> $GITHUB_ENV
+        mkdir ${{ env.BUILD_DIR }}
+        gfortran ${{ env.OUTPUT }} -J ${{ env.BUILD_DIR }} -o ${{ env.BUILD_DIR }}/fpm
+      env:
+        BUILD_DIR: build/bootstrap
+
+    - name: Undo patch
+      run: |
+        patch -p1 -R < ./ci/single-file.patch
+
+    - name: Build fpm with bootstrap version
+      run: |
+        ${{ env.EXE }} build
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: ${{ env.OUTPUT }}
+        path: ${{ env.OUTPUT }}
+
+  upload-artifacts:
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    needs:
+      - source-archive
+      - source-single-file
+
+    steps:
+    - name: Download Artifacts
+      uses: actions/download-artifact@v2
+      with:
+        path: ${{ github.workspace }} # This will download all files
+
+    - name: Create SHA256 checksums
+      run: |
+        for output in fpm-*/fpm-*; do
+          pushd $(dirname "$output")
+          sha256sum $(basename "$output") | tee $(basename "$output").sha256
+          popd
+        done
+
+    - name: Upload assets
+      if: ${{ github.event_name == 'release' }}
+      uses: svenstaro/upload-release-action@v2
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        file: fpm-*/fpm-*
+        file_glob: true
+        tag: ${{ github.ref }}
+        overwrite: true

ci/single-file-gfortran.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+output="${OUTPUT:-fpm-single-file.F90}"
+
+args=("$@")
+file=$(printf "%s\n" "${args[@]}" | grep -P '^.+\.[fF]90$')
+if [ $? = 0 ]; then
+  echo " + Appending source file '$file' to '${output}'"
+  cat $file >> "${output}"
+fi
+exec gfortran "${args[@]}"

ci/single-file.patch

@@ -0,0 +1,29 @@
+diff --git a/fpm.toml b/fpm.toml
+index 12ec05aa..20425dfd 100644
+--- a/fpm.toml
++++ b/fpm.toml
+@@ -14,22 +14,5 @@ rev = "2f5eaba864ff630ba0c3791126a3f811b6e437f3"
+ git = "https://github.com/urbanjost/M_CLI2.git"
+ rev = "ea6bbffc1c2fb0885e994d37ccf0029c99b19f24"
+
+-[[test]]
+-name = "cli-test"
+-source-dir = "test/cli_test"
+-main = "cli_test.f90"
+-
+-[[test]]
+-name = "new-test"
+-source-dir = "test/new_test"
+-main = "new_test.f90"
+-
+-[[test]]
+-name = "fpm-test"
+-source-dir = "test/fpm_test"
+-main = "main.f90"
+-
+-[[test]]
+-name = "help-test"
+-source-dir = "test/help_test"
+-main = "help_test.f90"
++[build]
++auto-tests = false