internal/rosa: cmake abstraction

This is a helper for generating cure script for a cmake-based project.

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

internal/rosa/cmake.go

@@ -1,6 +1,12 @@
 package rosa
 
-import "hakurei.app/internal/pkg"
+import (
+	"slices"
+	"strings"
+
+	"hakurei.app/container/check"
+	"hakurei.app/internal/pkg"
+)
 
 // NewCMake returns a [pkg.Artifact] containing an installation of CMake.
 func (t Toolchain) NewCMake() pkg.Artifact {
@@ -29,3 +35,93 @@ make DESTDIR=/work install
 			pkg.TarGzip,
 		)))
 }
+
+// CMakeAttr holds the project-specific attributes that will be applied to a new
+// [pkg.Artifact] compiled via CMake.
+type CMakeAttr struct {
+	// Path elements joined with source.
+	Append []string
+	// Use source tree as scratch space.
+	Writable bool
+	// Dependencies concatenated with the build system itself.
+	Extra []pkg.Artifact
+
+	// CMake CACHE entries.
+	Cache [][2]string
+	// Additional environment variables.
+	Env []string
+	// Runs before cmake.
+	ScriptEarly string
+	// Runs after cmake.
+	Script string
+
+	// Override the default installation prefix [AbsSystem].
+	Prefix *check.Absolute
+}
+
+// NewViaCMake returns a [pkg.Artifact] for compiling and installing via CMake.
+func (t Toolchain) NewViaCMake(
+	name, version, variant string,
+	source pkg.Artifact,
+	attr *CMakeAttr,
+) pkg.Artifact {
+	if name == "" || version == "" || variant == "" {
+		panic("names must be non-empty")
+	}
+	if attr == nil {
+		attr = &CMakeAttr{
+			Cache: [][2]string{
+				{"CMAKE_BUILD_TYPE", "Release"},
+			},
+		}
+	}
+	if len(attr.Cache) == 0 {
+		panic("CACHE must be non-empty")
+	}
+
+	cmakeExtras := []pkg.Artifact{
+		t.NewCMake(),
+		t.NewNinja(),
+	}
+	if t == toolchainStage3 {
+		cmakeExtras = nil
+	}
+
+	scriptEarly := attr.ScriptEarly
+	if attr.Writable {
+		scriptEarly = `
+chmod -R +w "${ROSA_CMAKE_SOURCE}"
+` + scriptEarly
+	}
+
+	prefix := attr.Prefix
+	if prefix == nil {
+		prefix = AbsSystem
+	}
+
+	sourcePath := AbsUsrSrc.Append(name)
+	return t.New(name+"-"+variant+"-"+version, slices.Concat(
+		attr.Extra,
+		cmakeExtras,
+	), nil, slices.Concat([]string{
+		"ROSA_CMAKE_SOURCE=" + sourcePath.Append(attr.Append...).String(),
+		"ROSA_INSTALL_PREFIX=/work" + prefix.String(),
+	}, attr.Env), scriptEarly+`
+cd "$(mktemp -d)"
+cmake -G Ninja \
+	-DCMAKE_C_COMPILER_TARGET="${ROSA_TRIPLE}" \
+	-DCMAKE_CXX_COMPILER_TARGET="${ROSA_TRIPLE}" \
+	-DCMAKE_ASM_COMPILER_TARGET="${ROSA_TRIPLE}" \
+	`+strings.Join(slices.Collect(func(yield func(string) bool) {
+		for _, v := range attr.Cache {
+			if !yield("-D" + v[0] + "=" + v[1]) {
+				return
+			}
+		}
+	}), " \\\n\t")+` \
+	-DCMAKE_INSTALL_PREFIX="${ROSA_INSTALL_PREFIX}" \
+	"${ROSA_CMAKE_SOURCE}"
+cmake --build .
+cmake --install .
+`+attr.Script, pkg.Path(sourcePath, attr.Writable, source))
+}