initial os release. I really expect SO much bugs, guys. good luck =)

sabry_build/src/buildmagic.rs

@@ -0,0 +1,305 @@
+use std::{
+    collections::HashSet,
+    convert::Infallible,
+    fs::{self, OpenOptions},
+    io::{self, Write},
+    path::PathBuf,
+    str::FromStr, vec,
+};
+
+use sabry_intrnl::{
+    compiler::{CompilerAdapter, SabryCompilerError},
+    config::{
+        manifest::ManifestError,
+        BehavHashCollision, BehavSassModCollision, SabryConfig,
+    },
+    scoper::{hash::ScopeHash, ArbitraryScope, ScopeError},
+};
+use sabry_procmacro_impl::impls::styly;
+use walkdir::WalkDir;
+
+use crate::filevisit::{self, FileVisitError};
+
+type ModuleName = String;
+type ModuleCode = String;
+type StyleModule = (ModuleName, ModuleCode);
+type BuilderResult = Result<(), SabryBuildError>;
+
+pub fn buildy(inline_side_modules: impl IntoIterator<Item = StyleModule>) -> BuilderResult {
+    println!("🧙: This is probably the stderr. Something went wrong:");
+
+    let config = SabryConfig::require()?;
+    let mut builder = SabryBuilder::new(config);
+
+    println!("🧙 loading preludes");
+    builder.load_preludes()?;
+
+    println!("🧙 loading `buildy` modules");
+    for (name, code) in inline_side_modules {
+        builder.load_side_module(name, code)?;
+    }
+
+    println!("🧙 loading this crate");
+    builder.load_styles_from_this_crate()?;
+
+    println!("🧙 compiling CSS");
+    builder.compile_everything()?;
+
+    println!("🧙 writing an output");
+    builder.generate_output()?;
+
+    Ok(())
+}
+
+pub struct SabryBuilder {
+    config: SabryConfig,
+    css_compiler: CompilerAdapter,
+    state: SabryBuildState,
+}
+
+//🧙
+impl SabryBuilder {
+    pub fn new(config: SabryConfig) -> Self {
+        let css_compiler = CompilerAdapter::new(config.clone());
+        Self {
+            config,
+            css_compiler,
+            state: SabryBuildState::default(),
+        }
+    }
+
+    /// Write all the loaded CSS
+    ///
+    /// - Bundle file (if configured)
+    /// - Scope chunks (if out-dir is configured)
+    pub fn generate_output(&mut self) -> BuilderResult {
+        // warn on empty loaded_css_modules
+        if self.state.loaded_css_modules.is_empty() {
+            println!("🧙 sabry didn't compile any CSS. Perhaps the crate has no styles? Lets write some!\nAlso you should check that you do use `styly!` macro properly - at the top level as an item.");
+        }
+
+        if let Some(scope_dir) = &self.config.css.scopes {
+            println!("🧙 writing CSS files for each of loaded scopes into {scope_dir}");
+
+            fs::create_dir_all(scope_dir)?;
+            for (scope, code) in &self.state.loaded_css_modules {
+                let scope_path = format!("{}/{}.css", scope_dir, scope);
+                fs::write(scope_path, code)?;
+            }
+        }
+
+        if let Some(bundle_file) = &self.config.css.bundle {
+            println!("🧙 writing merged CSS for the entire crate into {bundle_file}");
+
+            let path = PathBuf::from_str(bundle_file)?;
+
+            if let Some(dir) = path.parent() {
+                fs::create_dir_all(dir)?;
+            }
+
+            // remove the file to write new fresh tasty CSS
+            let _ = fs::remove_file(&path);
+            // and then reopen it
+            let mut file = OpenOptions::new()
+                .create_new(true)
+                .append(true)
+                .open(path)?;
+
+            for (_, code) in &self.state.loaded_css_modules {
+                write!(file, " {}", self.state.css_prelude)?;
+                write!(file, " {code}")?;
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Compile all the loaded styles, SASS/SCSS/CSS, without actually writing them.
+    pub fn compile_everything(&mut self) -> BuilderResult {
+        // warn on empty known_side_modules and loaded_stylyses
+        if self.state.known_side_modules.is_empty() {
+            println!("🧙 sabry didn't load any side modules");
+        }
+        if self.state.loaded_stylyses.is_empty() {
+            println!("🧙 sabry didn't load any usable styles");
+        }
+
+        for styly in &self.state.loaded_stylyses {
+            let scope = ArbitraryScope::from_source(
+                styly.syntax.into(),
+                styly.scope.clone(),
+                styly.code.code(),
+            )?
+            .hashed(&self.config.hash)?;
+
+            match self.config.hash.collision {
+                BehavHashCollision::Ignore => {}
+                BehavHashCollision::Error => {
+                    if self.state.known_scope_hashes.contains(&scope.hash) {
+                        return Err(SabryBuildError::HashCollision {
+                            scope: scope.original_scope.name.to_string(),
+                        });
+                    }
+                    self.state.known_scope_hashes.insert(scope.hash.clone());
+                }
+            }
+
+            let css = self.css_compiler.compile_module(
+                scope.original_scope.adapter().syntax.into(),
+                &scope.hashed_code,
+            )?;
+            self.state
+                .loaded_css_modules
+                .push((scope.original_scope.name.to_string(), css));
+        }
+
+        Ok(())
+    }
+
+    /// Visit all the source files in the current crate and look for code that may affect building process:
+    ///
+    /// - `styly!` macro calls
+    ///
+    /// Only files with an **.rs** extension are visited.
+    ///
+    /// All the gathered info is loaded into state
+    pub fn load_styles_from_this_crate(&mut self) -> BuilderResult {
+        println!("🧙 scanning the crate");
+
+        let root = WalkDir::new(&self.config.sass.scanroot);
+
+        for entry in root {
+            let entry = entry?;
+            let metadata = entry.metadata()?;
+
+            if metadata.is_file() {
+                let entry_path = entry.path();
+                let ext = entry_path.extension().unwrap_or_default();
+                if ext == "rs" {
+                    let visitor = filevisit::visit_file(entry_path)?;
+                    self.state.loaded_stylyses.extend(visitor.found_stylys);
+                }
+            } else if metadata.is_symlink() {
+                println!(
+                    "🧙 sabry won't go through symlinks currently ('{}' is a symlink)",
+                    entry.path().to_string_lossy()
+                )
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Load up configured preludes as side modules
+    pub fn load_preludes(&mut self) -> BuilderResult {
+        // load sass modules from config
+        let mut modules: Vec<StyleModule> = vec![];
+        if let Some(sass_pre) = &self.config.sass.modules {
+            for pre in sass_pre {
+                let pre_path = PathBuf::from_str(pre)?;
+                let pre_name = pre_path
+                    .file_name()
+                    .ok_or(SabryBuildError::FileName())?
+                    .to_string_lossy()
+                    .to_string();
+                let code = fs::read_to_string(pre_path)?;
+                modules.push((pre_name, code));
+            }
+        }
+        for (name, code) in modules {
+            self.load_side_module(name, code)?;
+        }
+
+        // load css preludes
+        if let Some(css_pre) = &self.config.css.bundle_prelude {
+            for pre in css_pre {
+                let code = fs::read_to_string(pre)?;
+                self.state.css_prelude.push_str(&code);
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Load up the SASS module by its `name` and fill the according file by its `code` as-is
+    ///
+    /// Module "loading" is simply a file creation. File is created in the configured `intermediate_dir`
+    /// directory.
+    ///
+    /// Module `name` is not suffixed with syntax/extensions/whatever so it already should have necessary file extensions.
+    ///
+    /// This function will not overwrite the module file. Never.
+    ///
+    pub fn load_side_module(&mut self, name: ModuleName, code: ModuleCode) -> BuilderResult {
+        println!("🧙 loading side module '{}'", &name);
+
+        let module_file_path = format!("{}/{}", &self.config.sass.intermediate_dir, &name);
+        let mut open_options = OpenOptions::new();
+        let mut open_options = open_options.write(true);
+
+        // prematurelly remove module file if the module is not yet known to be loaded
+        if !self.state.known_side_modules.contains(&name) {
+            let _ = fs::remove_file(&module_file_path);
+        }
+
+        open_options = if self.state.known_side_modules.contains(&name) {
+            match &self.config.sass.module_name_collision {
+                BehavSassModCollision::Error => {
+                    return Err(SabryBuildError::ModuleCollision { module: name })
+                }
+                BehavSassModCollision::Merge => {
+                    println!("🧙 sabry found duplicate module name '{name}': merging code, as configured");
+                    open_options.append(true)
+                }
+            }
+        } else {
+            open_options.create(true)
+        };
+
+        fs::create_dir_all(&self.config.sass.intermediate_dir)?;
+        let mut module_file = open_options.open(module_file_path)?;
+
+        write!(module_file, "\n{code}\n")?;
+
+        self.state.known_side_modules.insert(name);
+
+        Ok(())
+    }
+}
+
+#[derive(Default)]
+pub struct SabryBuildState {
+    known_scope_hashes: HashSet<ScopeHash>,
+    known_side_modules: HashSet<ModuleName>,
+    loaded_stylyses: Vec<styly::MacroSyntax>,
+    loaded_css_modules: Vec<StyleModule>,
+    css_prelude: String,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum SabryBuildError {
+    #[error("Filesystem error")]
+    Fs(#[from] io::Error),
+    #[error("Failed to walk through the crate")]
+    CrateWalk(#[from] walkdir::Error),
+    #[error("Failed to load side SASS module")]
+    LoadSass(),
+    #[error(
+        "Module with the similar name was already loaded, and sabry is configured to raise an error"
+    )]
+    ModuleCollision { module: ModuleName },
+    #[error("Sabry cant understand the file")]
+    FileVisit(#[from] FileVisitError),
+    #[error("Syntax of style can not be parsed")]
+    SyntaxParse(#[from] ScopeError),
+    #[error("Another scope has the same hash, and sabry is configured to raise an error. Try to adjust config, increase hash size, or change the style code")]
+    HashCollision { scope: ModuleName },
+    #[error("Something's wrong with file path")]
+    Path(#[from] Infallible),
+    #[error("File name wasnt determined properly")]
+    FileName(),
+    #[error("Failed to compile CSS")]
+    CssCompile(#[from] SabryCompilerError),
+    #[error("Failed to load config/manifest")]
+    Manifest(#[from] ManifestError),
+}