fix!: Switch from libsass to grass

Not perfect SASS compatibility

Fixes cobalt-org#1050

Cargo.toml

@@ -103,9 +103,8 @@ vimwiki = { version = "0.1", features = ["html"] }
 file-serve = { version = "0.2.1", path = "crates/file-serve", optional = true }
 notify = { version = "4", optional = true }
 
-sass-rs = { version = "0.2", optional = true }
-
 html-minifier = {version="3.0", optional = true }
+grass = { version = "0.11.2", default-features = false }
 
 [dev-dependencies]
 trycmd = "0.14"
@@ -118,7 +117,7 @@ preview_unstable = ["cobalt-config/preview_unstable"]
 
 serve = ["file-serve", "notify"]
 syntax-highlight = ["engarde/syntax"]
-sass = ['sass-rs']
+sass = []
 
 [profile.release]
 lto = "thin"

src/cobalt_model/sass.rs

@@ -1,8 +1,6 @@
 use std::ffi;
 use std::path;
 
-#[cfg(feature = "sass")]
-use sass_rs;
 use serde::{Deserialize, Serialize};
 
 use super::files;
@@ -13,19 +11,15 @@ pub use cobalt_config::SassOutputStyle;
 #[derive(Debug, Clone, PartialEq, Eq, Default, Serialize, Deserialize)]
 #[serde(deny_unknown_fields, default)]
 pub struct SassBuilder {
-    pub import_dir: Option<String>,
+    pub import_dir: std::path::PathBuf,
     pub style: SassOutputStyle,
 }
 
 impl SassBuilder {
     pub fn from_config(config: cobalt_config::Sass, source: &path::Path) -> Self {
         Self {
             style: config.style,
-            import_dir: source
-                .join(config.import_dir)
-                .into_os_string()
-                .into_string()
-                .ok(),
+            import_dir: source.join(config.import_dir),
         }
     }
 
@@ -37,7 +31,7 @@ impl SassBuilder {
 
 #[derive(Debug, PartialEq, Eq)]
 pub struct SassCompiler {
-    import_dir: Option<String>,
+    import_dir: std::path::PathBuf,
     style: SassOutputStyle,
 }
 
@@ -60,17 +54,16 @@ impl SassCompiler {
         file_path: &path::Path,
         minify: &Minify,
     ) -> Result<()> {
-        let sass_opts = sass_rs::Options {
-            include_paths: self.import_dir.iter().cloned().collect(),
-            output_style: match self.style {
-                SassOutputStyle::Nested => sass_rs::OutputStyle::Nested,
-                SassOutputStyle::Expanded => sass_rs::OutputStyle::Expanded,
-                SassOutputStyle::Compact => sass_rs::OutputStyle::Compact,
-                SassOutputStyle::Compressed => sass_rs::OutputStyle::Compressed,
-            },
-            ..Default::default()
-        };
-        let content = sass_rs::compile_file(file_path, sass_opts).map_err(failure::err_msg)?;
+        let sass_opts = grass::Options::default()
+            .style(match self.style {
+                SassOutputStyle::Nested | SassOutputStyle::Expanded => grass::OutputStyle::Expanded,
+                SassOutputStyle::Compact | SassOutputStyle::Compressed => {
+                    grass::OutputStyle::Compressed
+                }
+            })
+            .load_path(&self.import_dir);
+        let raw = std::fs::read_to_string(file_path)?;
+        let content = grass::from_string(raw, &sass_opts)?;
 
         let rel_src = file_path
             .strip_prefix(source)