internal/rosa: meson helper

This is used by quite a few projects.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/meson.go

@@ -1,6 +1,11 @@
 package rosa
 
-import "hakurei.app/internal/pkg"
+import (
+	"slices"
+	"strings"
+
+	"hakurei.app/internal/pkg"
+)
 
 func (t Toolchain) newMeson() pkg.Artifact {
 	const (
@@ -25,3 +30,96 @@ python3 setup.py \
 	)))
 }
 func init() { artifactsF[Meson] = Toolchain.newMeson }
+
+// MesonAttr holds the project-specific attributes that will be applied to a new
+// [pkg.Artifact] compiled via [Meson].
+type MesonAttr struct {
+	// Mount the source tree writable.
+	Writable bool
+
+	// Additional environment variables.
+	Env []string
+	// Runs before setup.
+	ScriptEarly string
+	// Runs after configure.
+	ScriptCompiled string
+	// Runs after install.
+	Script string
+
+	// Flags passed to the setup command.
+	Configure [][2]string
+	// Whether to skip meson test.
+	SkipCheck bool
+	// Appended after the test command.
+	AppendTest string
+
+	// Suffix appended to the source pathname.
+	SourceSuffix string
+
+	// Passed through to [Toolchain.New], before source.
+	Paths []pkg.ExecPath
+	// Passed through to [Toolchain.New].
+	Flag int
+}
+
+// NewViaMeson returns a [pkg.Artifact] for compiling and installing via [Meson].
+func (t Toolchain) NewViaMeson(
+	name, version string,
+	source pkg.Artifact,
+	attr *MesonAttr,
+	extra ...pkg.Artifact,
+) pkg.Artifact {
+	if name == "" || version == "" {
+		panic("names must be non-empty")
+	}
+	if attr == nil {
+		attr = new(MesonAttr)
+	}
+
+	scriptCompiled := attr.ScriptCompiled
+	if len(scriptCompiled) > 0 && scriptCompiled[0] != '\n' {
+		scriptCompiled = "\n" + scriptCompiled
+	}
+
+	var check string
+	if !attr.SkipCheck {
+		check = "\nmeson test \\\n\t--print-errorlogs" + attr.AppendTest
+	}
+
+	return t.New(name+"-"+version, attr.Flag, slices.Concat([]pkg.Artifact{
+		t.Load(Python),
+		t.Load(Meson),
+		t.Load(Ninja),
+
+		t.Load(PkgConfig),
+		t.Load(CMake),
+	}, extra), nil, attr.Env, attr.ScriptEarly+`
+cd "$(mktemp -d)"
+meson setup \
+	`+strings.Join(slices.Collect(func(yield func(string) bool) {
+		for _, v := range append([][2]string{
+			{"prefix", "/system"},
+			{"buildtype", "release"},
+		}, attr.Configure...) {
+			s := "-" + v[0]
+			if len(v[0]) > 0 && v[0][0] != 'D' {
+				s = "-" + s
+			}
+			if v[1] != "" {
+				s += "=" + v[1]
+			}
+			if !yield(s) {
+				return
+			}
+		}
+	}), " \\\n\t")+` \
+	. /usr/src/`+name+`
+meson compile`+scriptCompiled+check+`
+meson install \
+	--destdir=/work
+`+attr.Script, slices.Concat(attr.Paths, []pkg.ExecPath{
+		pkg.Path(AbsUsrSrc.Append(
+			name+attr.SourceSuffix,
+		), attr.Writable, source),
+	})...)
+}