vala: Compile and run using Meson

Author: Diego-Ivan

src/PanelCode.js

@@ -4,6 +4,7 @@ import GObject from "gi://GObject";
 import { makeDropdownFlat, settings as global_settings } from "./util.js";
 import { setupRustProject } from "./langs/rust/rust.js";
 import { setupTypeScriptProject } from "./langs/typescript/typescript.js";
+import { setupValaProject } from "./langs/vala/vala.js";
 
 export default function PanelCode({
   builder,
@@ -55,6 +56,10 @@ export default function PanelCode({
     stack_code.visible_child_name = panel.language;
     previewer.useInternal().catch(console.error);
 
+    if (panel.language.toLowerCase() === "vala") {
+      setupValaProject(file).catch(console.error);
+    }
+
     if (panel.language.toLowerCase() === "rust") {
       setupRustProject(file).catch(console.error);
     }

src/langs/vala/Compiler.js

@@ -1,49 +1,44 @@
 import Gio from "gi://Gio";
 import dbus_previewer from "../../Previewer/DBusPreviewer.js";
-import { decode } from "../../util.js";
 
 export default function ValaCompiler({ session }) {
   const { file } = session;
 
-  const module_file = file.get_child("libworkbenchcode.so");
-  const file_vala = file.get_child("main.vala");
+  const meson_builddir = "builddir";
+  const module_file = file
+    .get_child(meson_builddir)
+    .get_child("libworkbenchcode.so");
 
   async function compile() {
-    let args;
+    // TODO: Do not run setup if the build directory is already
+    // configured
+    const meson_launcher = new Gio.SubprocessLauncher();
+    meson_launcher.set_cwd(file.get_path());
+    const meson_setup = meson_launcher.spawnv([
+      "meson",
+      "setup",
+      meson_builddir,
+    ]);
 
-    try {
-      const [contents] = await file_vala.load_contents_async(null);
-      const code = decode(contents);
-      args = getValaCompilerArguments(code);
-    } catch (error) {
-      console.debug(error);
-      return;
+    await meson_setup.wait_async(null);
+    const setup_result = meson_setup.get_successful();
+    if (!setup_result) {
+      return false;
     }
 
-    const valac_launcher = new Gio.SubprocessLauncher();
-    valac_launcher.set_cwd(file.get_path());
-    const valac = valac_launcher.spawnv([
-      "valac",
-      file_vala.get_path(),
-      "--hide-internal",
-      "-X",
-      "-shared",
-      "-X",
-      "-fpic",
-      "--library",
-      "workbench",
-      "-o",
-      module_file.get_path(),
-      "--vapi",
-      "/dev/null",
-      ...args,
+    const meson_compile = meson_launcher.spawnv([
+      "meson",
+      "compile",
+      "-C",
+      meson_builddir,
     ]);
 
-    await valac.wait_async(null);
+    await meson_compile.wait_async(null);
+    const compile_result = meson_compile.get_successful();
 
-    const result = valac.get_successful();
-    valac_launcher.close();
-    return result;
+    meson_launcher.close();
+
+    return compile_result;
   }
 
   async function run() {
@@ -60,11 +55,3 @@ export default function ValaCompiler({ session }) {
 
   return { compile, run };
 }
-
-// Takes a string starting with the line
-// #!/usr/bin/env -S vala workbench.vala --pkg gtk4 --pkg libadwaita-1
-// and return ["--pkg", "gtk4", "--pkg", "libadwaita-1"]
-// FIXME: consider using https://docs.gtk.org/glib/struct.OptionContext.html instead
-function getValaCompilerArguments(text) {
-  return text.split("\n")[0]?.split("-S vala ")[1]?.split(" ") || [];
-}

src/langs/vala/template/meson.build

@@ -30,10 +30,10 @@ dependencies = [
     dependency('webkitgtk-6.0'),
     dependency('gstreamer-1.0'),
     dependency('gtksourceview-5'),
+    dependency('json-glib-1.0'),
 ]
 
-executable('demo', source_files,
-  objects: 'libworkbenchcode.so',
+library('workbenchcode', source_files,
   dependencies: dependencies,
        install: true,
 )

src/langs/vala/vala.js

@@ -2,7 +2,7 @@ import Gio from "gi://Gio";
 
 import { isValaEnabled } from "../../Extensions/Extensions.js";
 import { createLSPClient } from "../../common.js";
-import { getLanguage } from "../../util.js";
+import { getLanguage, copy } from "../../util.js";
 
 export function setup({ document }) {
   if (!isValaEnabled()) return;
@@ -44,3 +44,24 @@ export function setup({ document }) {
 
   return lspc;
 }
+
+const vala_template_dir = Gio.File.new_for_path(
+  pkg.pkgdatadir,
+).resolve_relative_path("langs/vala/template");
+
+export async function setupValaProject(destination) {
+  return Promise.all([
+    copy(
+      "meson.build",
+      vala_template_dir,
+      destination,
+      Gio.FileCopyFlags.OVERWRITE,
+    ),
+    copy(
+      "workbench.vala",
+      vala_template_dir,
+      destination,
+      Gio.FileCopyFlags.OVERWRITE,
+    ),
+  ]);
+}