meson: add script to fix up sourcemap by adding sourceRoot

scripts/fix-sourcemap.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+import json
+from argparse import ArgumentParser, FileType
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument(
+        "sourcemap",
+        type=FileType("r+", encoding="utf-8"),
+        help="The sourcemap to modify",
+    )
+    parser.add_argument("base_url", help="The sourceRoot URL")
+    args = parser.parse_args()
+
+    content = json.load(args.sourcemap)
+    if content["version"] < 3:
+        raise ValueError("Sourcemap version 2 and lower is not supported")
+    content["sourceRoot"] = args.base_url
+    args.sourcemap.seek(0)
+    json.dump(content, args.sourcemap)
+
+
+if __name__ == "__main__":
+    main()

scripts/meson.build

@@ -7,5 +7,6 @@ if host_machine.system() == 'windows'
 elif host_machine.system() == 'emscripten'
     python_exe = find_program('python3', 'python')
     wasm_bundler_exe = [python_exe, meson.current_source_dir() / 'generate-wasm-bundle.py']
+    sourcemap_fixer_exe = [python_exe, meson.current_source_dir() / 'fix-sourcemap.py']
 endif
 

src/meson.build

@@ -87,6 +87,7 @@ lite_exe = executable('lite-xl',
 )
 
 if get_option('wasm_debug') == 'sourcemap'
+    python_exe = find_program('python3', 'python')
     emstrip_exe = find_program('emstrip')
     custom_target(
         'lite-xl-stripped',
@@ -101,7 +102,7 @@ if get_option('wasm_debug') == 'sourcemap'
 
     custom_target(
         'lite-xl.wasm.map',
-        command: [emstrip_exe, '--version'],
+        command: [sourcemap_fixer_exe, '@OUTPUT0@', get_option('wasm_sourcemap_base')],
         input: 'meson.build',
         output: 'lite-xl.wasm.map',
         depends: [lite_exe],