ci: first cut of running tests on macOS

Get a simple version of our tests running against "latest" Go and
"latest" Vim on macOS. We can update this to be more specific later. For
now neither capture nor upload any artefacts post build.

To install Vim we follow the approach laid out in:

    https://blog.myitcv.io/2020/02/04/portable-ci-cd-with-pure-go-github-actions.html

to create a local pure Go GitHub action to install Vim, rather than
relying on a third-party NodeJS action.

Updates #481

.github/workflows/test.yml

@@ -59,3 +59,32 @@ jobs:
       with:
         path: /home/runner/.artefacts
         name: ${{ matrix.os }}_${{ matrix.go_version }}_${{ matrix.vim_flavor }}_${{ matrix.vim_version }}
+        name: artefacts
+
+  test-macos:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest]
+        go_version: ['1.14.x']
+        vim_version: ["master"]
+    runs-on: ${{ matrix.os }}
+    env:
+      VIM_FLAVOR: vim
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@722adc63f1aa60a57ec37892e133b1d319cae598
+    - name: Install Vim
+      uses: ./github/actions/setupvim
+      with:
+        version: ${{ matrix.vim_version }}
+    - name: Install Go
+      uses: actions/setup-go@9fbc767707c286e568c92927bbf57d76b73e0892
+      with:
+        go-version: ${{ matrix.go_version }}
+    - name: Vim version
+      run: vim --version
+    - name: Go version
+      run: go version
+    - name: Run tests
+      run: go run ./internal/cmd/dots go test -timeout 0s ./...

github/actions/setupvim/README.md

@@ -0,0 +1,3 @@
+### `github.com/govim/govim/github/actions/setupvim`
+
+`setupvim` is a pure Go GitHub Action for install Vim on various platforms. It is a work-in-progress.

github/actions/setupvim/action.yml

@@ -0,0 +1,13 @@
+name: 'Setup Vim'
+description: 'Setup Vim in your workflow'
+inputs:
+  version:
+    description: >
+      Version of Vim to install. Valid values are git refs (e.g. 'master', a branch name or commit hash)
+      or version tags (e.g. 'v8.2.0126')
+    required: false
+    default: 'master'
+
+runs:
+  using: 'node12'
+  main: 'index.js'

github/actions/setupvim/go.mod

@@ -0,0 +1,5 @@
+module github.com/govim/govim/github/actions/setupvim
+
+go 1.14
+
+require github.com/sethvargo/go-githubactions v0.1.1

github/actions/setupvim/go.sum

@@ -0,0 +1,2 @@
+github.com/sethvargo/go-githubactions v0.1.1 h1:u75rV0C+AvNjEUE4maSN844/U5eiy9Rlc3ahOU4EAfE=
+github.com/sethvargo/go-githubactions v0.1.1/go.mod h1:ugCoIFQjs7HxIwwYiY7ty6H9T+7Z4ey481HxqA3VRKE=

github/actions/setupvim/index.js

@@ -0,0 +1,22 @@
+"use strict";
+
+const spawn = require("child_process").spawn;
+
+async function run() {
+	var args = Array.prototype.slice.call(arguments);
+	const cmd = spawn(args[0], args.slice(1), {
+		stdio: "inherit",
+		cwd: __dirname
+	});
+	const exitCode = await new Promise((resolve, reject) => {
+		cmd.on("close", resolve);
+	});
+	if (exitCode != 0) {
+		process.exit(exitCode);
+	}
+}
+
+(async function() {
+	const path = require("path");
+	await run("go", "run", ".");
+})();

github/actions/setupvim/main.go

@@ -0,0 +1,56 @@
+// setupvim is a pure Go GitHub Action for install Vim on various platforms. It
+// is a work-in-progress.
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strconv"
+
+	"github.com/sethvargo/go-githubactions"
+)
+
+const debug = true
+
+func main() {
+	os.Exit(main1())
+}
+
+func main1() int {
+	if err := mainerr(); err != nil {
+		switch err := err.(type) {
+		case runCmdErr:
+			ee := err.error.(*exec.ExitError)
+			return ee.ProcessState.ExitCode()
+		default:
+			fmt.Fprintln(os.Stderr, err)
+			return 1
+		}
+	}
+	return 0
+}
+
+func mainerr() error {
+	td := tempDir("", "")
+	if !debug {
+		defer os.RemoveAll(td)
+	}
+	version := "master"
+	if v := githubactions.GetInput("version"); v != "" {
+		version = v
+	}
+	cmd("git", "clone", "-q", "--depth=1", "--single-branch", "--branch", version, "https://github.com/vim/vim", td).run()
+	id := tempDir("", "")
+	if !debug {
+		defer os.RemoveAll(id)
+	}
+	cmd("./configure", "--prefix="+id, "--with-features=huge", "--enable-fail-if-missing").runInDir(td)
+	cmd("make", "-j", strconv.Itoa(runtime.NumCPU())).runInDir(td)
+	cmd("make", "install").runInDir(td)
+	bin := filepath.Join(id, "bin")
+	githubactions.SetEnv("PATH", bin+string(os.PathListSeparator)+os.Getenv("PATH"))
+	return nil
+}

github/actions/setupvim/util.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+type command struct {
+	cmd *exec.Cmd
+}
+
+type runCmdErr struct {
+	error
+}
+
+func cmd(cmdname string, args ...string) *command {
+	cmd := exec.Command(cmdname, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return &command{
+		cmd: cmd,
+	}
+}
+
+func (c *command) run() {
+	format := "> "
+	wd, err := os.Getwd()
+	check(err, "failed to get working directory: %v", err)
+	runDir := wd
+	if d := c.cmd.Dir; d != "" {
+		rd, err := filepath.Abs(d)
+		check(err, "failed to make %v absolute: %v", d, err)
+		runDir = rd
+	}
+	if wd != runDir {
+		format += fmt.Sprintf("cd %v; ", runDir)
+	}
+	format += "%v\n"
+	fmt.Printf(format, strings.Join(c.cmd.Args, " "))
+	if err := c.cmd.Run(); err != nil {
+		panic(runCmdErr{err})
+	}
+}
+
+func (c *command) runInDir(dir string) {
+	c.cmd.Dir = dir
+	c.run()
+}
+
+func tempDir(dir, pattern string) string {
+	td, err := ioutil.TempDir(dir, pattern)
+	check(err, "failed to create temp dir: %v", err)
+	return td
+}
+
+func check(err error, format string, args ...interface{}) {
+	if err != nil {
+		panic(fmt.Errorf(format, args...))
+	}
+}

internal/cmd/genconfig/genconfig.go

@@ -303,6 +303,35 @@ jobs:
       with:
         path: /home/runner/.artefacts
         name: ${{ matrix.os }}_${{ matrix.go_version }}_${{ matrix.vim_flavor }}_${{ matrix.vim_version }}
+        name: artefacts
+
+  test-macos:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest]
+        go_version: ['1.14.x']
+        vim_version: ["master"]
+    runs-on: ${{ matrix.os }}
+    env:
+      VIM_FLAVOR: vim
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@722adc63f1aa60a57ec37892e133b1d319cae598
+    - name: Install Vim
+      uses: ./github/actions/setupvim
+      with:
+        version: ${{ matrix.vim_version }}
+    - name: Install Go
+      uses: actions/setup-go@9fbc767707c286e568c92927bbf57d76b73e0892
+      with:
+        go-version: ${{ matrix.go_version }}
+    - name: Vim version
+      run: vim --version
+    - name: Go version
+      run: go version
+    - name: Run tests
+      run: go run ./internal/cmd/dots go test -timeout 0s ./...
 `
 
 const maxVersions = `# Code generated by genconfig. DO NOT EDIT.