ignis: improve patch

gui-apps/ignis/files/ignis-grass-sass.patch

@@ -49,57 +49,57 @@ index f3a2ed5..e803171 100644
  
  
 diff --git a/ignis/utils/sass.py b/ignis/utils/sass.py
-index 9bd829d..a25fb2e 100644
+index 9bd829d..a891d85 100644
 --- a/ignis/utils/sass.py
 +++ b/ignis/utils/sass.py
-@@ -1,14 +1,31 @@
+@@ -1,14 +1,26 @@
  import os
 +import shutil
  import subprocess
 -from ignis.exceptions import SassCompilationError, DartSassNotFoundError
++import typing
 +from ignis.exceptions import SassCompilationError, SassNotFoundError
  
  TEMP_DIR = "/tmp/ignis"
  COMPILED_CSS = f"{TEMP_DIR}/compiled.css"
  os.makedirs(TEMP_DIR, exist_ok=True)
  
-+# pick a Sass compiler
-+sass_compiler = None
-+
-+sass_compilers = [
-+    "sass", # dart-sass
-+    "grass" # grass-sass
-+]
-+
-+for compiler in sass_compilers:
-+    sass_compiler = shutil.which(compiler)
-+
-+    if sass_compiler:
-+        break
++# resolve Sass compiler paths and pick a default one
++# "sass" (dart-sass) is the default,
++# "grass" is an API-compatible drop-in replacement
++known_compilers = typing.Literal["sass", "grass"]
++sass_compilers = {}
++for cmd in typing.get_args(known_compilers):
++    path = shutil.which(cmd)
++    if path:
++        sass_compilers[cmd] = path
 +        
  
- def compile_file(path: str) -> str:
+-def compile_file(path: str) -> str:
 -    result = subprocess.run(["sass", path, COMPILED_CSS], capture_output=True)
-+    assert sass_compiler
-+
-+    result = subprocess.run([sass_compiler, path, COMPILED_CSS], capture_output=True)
++def compile_file(path: str, compiler_path: str) -> str:
++    result = subprocess.run([compiler_path, path, COMPILED_CSS], capture_output=True)
  
      if result.returncode != 0:
          raise SassCompilationError(result.stderr.decode())
-@@ -18,8 +35,10 @@ def compile_file(path: str) -> str:
+@@ -17,9 +29,9 @@ def compile_file(path: str) -> str:
+         return file.read()
  
  
- def compile_string(string: str) -> str:
-+    assert sass_compiler
-+
+-def compile_string(string: str) -> str:
++def compile_string(string: str, compiler_path: str) -> str:
      process = subprocess.Popen(
 -        ["sass", "--stdin"],
-+        [sass_compiler, "--stdin"],
++        [compiler_path, "--stdin"],
          stdin=subprocess.PIPE,
          stdout=subprocess.PIPE,
          stderr=subprocess.PIPE,
-@@ -35,7 +54,8 @@ def compile_string(string: str) -> str:
- def sass_compile(path: str | None = None, string: str | None = None) -> str:
+@@ -32,28 +44,38 @@ def compile_string(string: str) -> str:
+         return stdout.decode()
+ 
+ 
+-def sass_compile(path: str | None = None, string: str | None = None) -> str:
++def sass_compile(path: str | None = None, string: str | None = None, compiler: known_compilers | None = None) -> str:
      """
      Compile a SASS/SCSS file or string.
 -    Requires `Dart Sass <https://sass-lang.com/dart-sass/>`_.
@@ -108,7 +108,8 @@ index 9bd829d..a25fb2e 100644
  
      Args:
          path: The path to the SASS/SCSS file.
-@@ -43,11 +63,11 @@ def sass_compile(path: str | None = None, string: str | None = None) -> str:
+         string: A string with SASS/SCSS style.
++        compiler: The desired Sass compiler, either ``sass`` or ``grass``.
  
      Raises:
          TypeError: If neither of the arguments is provided.
@@ -118,8 +119,24 @@ index 9bd829d..a25fb2e 100644
      """
 -    if not os.path.exists("/bin/sass"):
 -        raise DartSassNotFoundError()
-+    if not sass_compiler:
++    if not sass_compilers:
 +        raise SassNotFoundError()
++
++    if compiler and compiler not in sass_compilers:
++        raise SassNotFoundError()
++
++    if compiler:
++        compiler_path = sass_compilers[compiler]
++    else:
++        compiler_path = next(iter(sass_compilers.values()))
  
      if string:
-         return compile_string(string)
+-        return compile_string(string)
++        return compile_string(string, compiler_path)
+ 
+     elif path:
+-        return compile_file(path)
++        return compile_file(path, compiler_path)
+ 
+     else:
+         raise TypeError("sass_compile() requires at least one positional argument")