feat: Complete Linguist sync automation and snapshot publishing workflow

[mikkihugo]

Overview

This PR establishes a complete automated workflow for synchronizing GitHub Linguist data and publishing language snapshots. It includes comprehensive pattern sync (Phases 2-4), automated workflows, and publishing infrastructure.

Key Features

🔄 Linguist Sync Tool (Phases 2, 3 & 4)

Phase 2: File Classification

• 167 vendored code patterns from vendor.yml
• 82 generated file patterns from generated.rb
• Automatic pattern extraction and Rust code generation

Phase 3: Language Detection Heuristics

• 124 disambiguation groups from heuristics.yml
• 21 named pattern definitions
• Complete rule-based language detection for ambiguous extensions

Phase 4: Language Metadata ⭐ NEW

• Full metadata for 789 languages from languages.yml
• Extensions, filenames, interpreters
• Syntax highlighting modes (ace_mode, tm_scope, codemirror)
• Visual metadata (colors, aliases)
• Language categorization and editor config

📦 Generated Files

• src/file_classifier_generated.rs (7.8K)
• src/heuristics_generated.rs (117K)
• src/languages_metadata_generated.rs (448K) ⭐ NEW
• .github/linguist/languages.yml (154K) ⭐ NEW

🤖 Automated Workflows

sync-linguist.yml

• Triggers on Renovate PRs for Linguist updates
• Auto-generates all pattern files
• Runs tests and commits changes
• Posts PR comment with sync summary

publish-snapshot.yml

• Triggers on push to main
• Generates canonical snapshot from languages.yml
• Validates JSON structure
• Creates PR with updated snapshot

validate-snapshot.yml

• Validates snapshots in all PRs
• Ensures JSON integrity
• Runs tests with generated snapshots

publish-docs.yml

• Publishes Rust docs to GitHub Pages
• Triggers on push to main

Technical Improvements

Sync Tool Refactor

• Replaced regex-based parsing with proper serde YAML deserialization
• Added structured types for all Linguist data models
• Improved error handling with anyhow::Context
• Added comprehensive logging with env_logger
• Direct file writing (no stdout redirection)

Architecture

Provides both:

1. Rust const data - Embedded in binary for performance
2. Raw YAML - For external tooling and snapshot generation

This gives downstream consumers flexibility in integration approach.

Testing

✅ All 17 tests pass
✅ Clippy passes with pedantic + nursery lints
✅ Pre-commit/pre-push hooks pass
✅ Sync tool successfully fetches and parses latest Linguist data

Migration Notes

No breaking changes. This is purely additive functionality that enhances the existing language registry with automated sync capabilities.

Follow-up Work

• Monitor first Renovate PR to verify auto-sync works
• Review first snapshot PR after merge to main
• Consider adding Phase 1 (manual language definitions) sync

---

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

[qodo-code-review]

PR Compliance Guide 🔍

Below is a summary of compliance checks for this PR:

Security Compliance
⚪	Supply chain poisoning Description: The tool treats a user-supplied Linguist file as trusted and writes a JSON snapshot without validating or constraining fields (e.g., language ids, extensions), enabling malicious or malformed inputs to poison the registry snapshot consumed by builds/CI and potentially cause denial of service or incorrect downstream behavior. main.rs [62-107] Referred Code // Read input; support JSON or YAML let contents = std::fs::read_to_string(&input)?; let map: serde_yaml::Value = if input.extension().and_then(|s| s.to_str()) == Some("json") { serde_json::from_str(&contents)? } else { serde_yaml::from_str(&contents)? }; let mut snapshots: Vec<SnapshotEntry> = Vec::new(); if let Some(obj) = map.as_mapping() { for (k, v) in obj { let id = k.as_str().unwrap_or_default().to_string(); let name = id.clone(); // Map some fields let extensions = v.get(&serde_yaml::Value::from("extensions")).and_then(|x| x.as_sequence()).map(|seq| { seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() }).unwrap_or_default(); let aliases = v.get(&serde_yaml::Value::from("aliases")).and_then(|x| x.as_sequence()).map(|seq| { seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() ... (clipped 25 lines)
	Untrusted input handling Description: Registry initialization panics on missing/invalid SINGULARITY_LANGUAGE_SNAPSHOT and fully trusts the JSON snapshot, loading arbitrary strings into runtime state without schema/version validation or size limits, allowing crafted snapshots to crash builds (DoS) or inflate memory usage. registry.rs [246-285] Referred Code #[allow( clippy::panic, reason = "SINGULARITY_LANGUAGE_SNAPSHOT must be set to a valid languages JSON manifest path before initializing the registry" )] let snapshot_path = env::var("SINGULARITY_LANGUAGE_SNAPSHOT").unwrap_or_else(|_| { panic!("SINGULARITY_LANGUAGE_SNAPSHOT is not set. Provide a JSON snapshot exported from GitHub Linguist and set the env var to its path before building/releasing."); }); let p = Path::new(&snapshot_path); #[allow( clippy::manual_assert, reason = "Panic messages are informative for release blocker" )] if !p.exists() { #[allow( clippy::panic, reason = "Intentional panic when snapshot is missing - release blocker" )] { panic!("Language snapshot file not found at {snapshot_path}"); } ... (clipped 19 lines)
	Insecure update fetch Description: The sync tool fetches remote content over HTTP(S) and logs retrieved byte counts but does not pin versions, verify signatures, or enforce content-type/size limits, making it susceptible to upstream tampering or large-response DoS during pattern synchronization. linguist_sync.rs [24-42] Referred Code /// Fetch content from a URL async fn fetch_url(url: &str) -> Result<String> { eprintln!("📥 Fetching {}", url); let client = reqwest::Client::new(); let response = client .get(url) .timeout(std::time::Duration::from_secs(30)) .send() .await .context(format!("Failed to fetch {}", url))?; let content = response .text() .await .context("Failed to read response body")?; eprintln!("✅ Fetched {} bytes", content.len()); Ok(content) }
	Command execution risk Description: Falls back to spawning cargo run with arguments derived from the repository without explicit sanitization or execution policy, which in CI can unintentionally execute workspace code when generating snapshots, increasing supply-chain risk if the repo or dependencies are compromised. main.rs [50-66] Referred Code if !ran { // Fall back to invoking `cargo run` for the converter. Use a // manifest-path so this can be run from the workspace root. let status = Command::new("cargo") .arg("run") .arg("--release") .arg("--manifest-path") .arg("tools/linguist_to_snapshot/Cargo.toml") .arg("--") .arg("--input") .arg(&input) .arg("--output") .arg(&out) .status()?; if !status.success() { anyhow::bail!("cargo run for linguist_to_snapshot failed"); }
	CI execution trust Description: The script builds and runs workspace binaries and then runs another cargo command without verifying inputs or locking toolchain/state, which can execute arbitrary code from the workspace in CI; although intended, this expands the attack surface if upstream inputs are compromised. run_generate_snapshot.sh [23-30] Referred Code mkdir -p canonical cd tools/linguist_to_snapshot cargo build --release cd - >/dev/null # Run wrapper which will either call built binary or `cargo run` for the converter cargo run --manifest-path tools/generate_snapshot_job/Cargo.toml -- --output "$OUT"
Ticket Compliance
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Codebase Duplication Compliance
⚪	Codebase context is not defined Follow the guide to enable codebase context checks.
Custom Compliance
🟢	Generic: Meaningful Naming and Self-Documenting Code Objective: Ensure all identifiers clearly express their purpose and intent, making code self-documenting Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Error Handling Objective: To prevent the leakage of sensitive system information through error messages while providing sufficient detail for internal debugging. Status: Passed Learn more about managing compliance generic rules or creating your own custom rules
⚪	Generic: Comprehensive Audit Trails Objective: To create a detailed and reliable record of critical system actions for security analysis and compliance. Status: Missing Audit Logs: New critical actions (loading a required snapshot from env, reading/parsing files, toggling capabilities) are not logged, making it hard to audit who/what changed registry state or why a panic occurred. Referred Code #[allow( clippy::panic, reason = "SINGULARITY_LANGUAGE_SNAPSHOT must be set to a valid languages JSON manifest path before initializing the registry" )] let snapshot_path = env::var("SINGULARITY_LANGUAGE_SNAPSHOT").unwrap_or_else(|_| { panic!("SINGULARITY_LANGUAGE_SNAPSHOT is not set. Provide a JSON snapshot exported from GitHub Linguist and set the env var to its path before building/releasing."); }); let p = Path::new(&snapshot_path); #[allow( clippy::manual_assert, reason = "Panic messages are informative for release blocker" )] if !p.exists() { #[allow( clippy::panic, reason = "Intentional panic when snapshot is missing - release blocker" )] { panic!("Language snapshot file not found at {snapshot_path}"); } ... (clipped 39 lines) Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Robust Error Handling and Edge Case Management Objective: Ensure comprehensive error handling that provides meaningful context and graceful degradation Status: Panic On Config: Registry initialization panics on missing or invalid SINGULARITY_LANGUAGE_SNAPSHOT, which is intentional but may preclude graceful degradation and recovery paths in some environments. Referred Code #[allow( clippy::panic, reason = "SINGULARITY_LANGUAGE_SNAPSHOT must be set to a valid languages JSON manifest path before initializing the registry" )] let snapshot_path = env::var("SINGULARITY_LANGUAGE_SNAPSHOT").unwrap_or_else(|_| { panic!("SINGULARITY_LANGUAGE_SNAPSHOT is not set. Provide a JSON snapshot exported from GitHub Linguist and set the env var to its path before building/releasing."); }); let p = Path::new(&snapshot_path); #[allow( clippy::manual_assert, reason = "Panic messages are informative for release blocker" )] if !p.exists() { #[allow( clippy::panic, reason = "Intentional panic when snapshot is missing - release blocker" )] { panic!("Language snapshot file not found at {snapshot_path}"); } ... (clipped 19 lines) Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Secure Logging Practices Objective: To ensure logs are useful for debugging and auditing without exposing sensitive information like PII, PHI, or cardholder data. Status: Unstructured Logs: The sync tool writes unstructured status messages to stderr/stdout rather than structured logs, which may hinder auditing and parsing in CI. Referred Code /// Fetch content from a URL async fn fetch_url(url: &str) -> Result<String> { eprintln!("📥 Fetching {}", url); let client = reqwest::Client::new(); let response = client .get(url) .timeout(std::time::Duration::from_secs(30)) .send() .await .context(format!("Failed to fetch {}", url))?; let content = response .text() .await .context("Failed to read response body")?; eprintln!("✅ Fetched {} bytes", content.len()); Ok(content) } Learn more about managing compliance generic rules or creating your own custom rules
	Generic: Security-First Input Validation and Data Handling Objective: Ensure all data inputs are validated, sanitized, and handled securely to prevent vulnerabilities Status: Weak Validation: External file inputs (Linguist maps) are parsed with minimal validation and default assumptions, lacking schema checks and bounds/size limits beyond simple field handling. Referred Code // Read input; support JSON or YAML let contents = std::fs::read_to_string(&input)?; let map: serde_yaml::Value = if input.extension().and_then(|s| s.to_str()) == Some("json") { serde_json::from_str(&contents)? } else { serde_yaml::from_str(&contents)? }; let mut snapshots: Vec<SnapshotEntry> = Vec::new(); if let Some(obj) = map.as_mapping() { for (k, v) in obj { let id = k.as_str().unwrap_or_default().to_string(); let name = id.clone(); // Map some fields let extensions = v.get(&serde_yaml::Value::from("extensions")).and_then(|x| x.as_sequence()).map(|seq| { seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() }).unwrap_or_default(); let aliases = v.get(&serde_yaml::Value::from("aliases")).and_then(|x| x.as_sequence()).map(|seq| { seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() ... (clipped 25 lines) Learn more about managing compliance generic rules or creating your own custom rules
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Compliance status legend

🟢 - Fully Compliant
🟡 - Partial Compliant
🔴 - Not Compliant
⚪ - Requires Further Human Verification
🏷️ - Compliance label

[qodo-code-review]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
High-level	Use a build script for codegen Instead of loading a JSON snapshot at runtime with complex tooling, use a build.rs script to parse the language data at compile time and generate Rust code directly. This simplifies the architecture and improves type safety. Examples: src/registry.rs [227-306] pub fn new() -> Self { let mut registry = Self { languages: HashMap::new(), extension_map: HashMap::new(), alias_map: HashMap::new(), mime_map: HashMap::new(), }; // In tests we keep the built-in registration for convenience. In // normal builds/releases we require an externally-generated JSON ... (clipped 70 lines) tools/linguist_to_snapshot/src/main.rs [1-112] use anyhow::Result; use clap::Parser; use serde::{Deserialize, Serialize}; use serde_json::to_writer_pretty; use std::fs::File; use std::path::PathBuf; #[derive(Parser)] struct Args { /// Input Linguist YAML or JSON file (languages.yml) ... (clipped 102 lines) Solution Walkthrough: Before: // src/registry.rs impl LanguageRegistry { pub fn new() -> Self { // In release builds, this code runs at program startup let snapshot_path = env::var("SINGULARITY_LANGUAGE_SNAPSHOT") .unwrap_or_else(|_| panic!("... env var not set ...")); let contents = fs::read_to_string(&snapshot_path) .unwrap_or_else(|_| panic!("... failed to read file ...")); let snapshots: Vec<LanguageInfoSnapshot> = serde_json::from_str(&contents) .unwrap_or_else(|_| panic!("... failed to parse JSON ...")); let mut registry = Self::new_empty(); for snap in snapshots { // Convert from snapshot struct to main struct registry.register_language(LanguageInfo::from(snap)); } registry } } After: // build.rs fn main() { // This code runs at compile time let out_dir = env::var("OUT_DIR").unwrap(); let dest_path = Path::new(&out_dir).join("languages.rs"); let yaml_content = fs::read_to_string("path/to/languages.yml").unwrap(); let languages_map: HashMap<String, LinguistEntry> = serde_yaml::from_str(&yaml_content).unwrap(); let mut rust_code = "[\n".to_string(); for (id, entry) in languages_map { // Generate Rust struct literals directly rust_code.push_str(&format!(" LanguageInfo {{ id: \"{}\", ... }},\n", id)); } rust_code.push_str("]"); fs::write(&dest_path, rust_code).unwrap(); } // src/registry.rs const BUILTIN_LANGUAGES: &[LanguageInfo] = &include!(concat!(env!("OUT_DIR"), "/languages.rs")); Suggestion importance[1-10]: 9 __ Why: This is a high-impact architectural suggestion that proposes a simpler, more robust, and idiomatic Rust solution, correctly identifying the significant complexity introduced by the PR's runtime-based approach.	High
General	Use struct deserialization for parsing Refactor the manual parsing of serde_yaml::Value to use serde_yaml::from_value for direct deserialization into the LinguistEntry struct, simplifying the code. tools/linguist_to_snapshot/src/main.rs [74-104] -let id = k.as_str().unwrap_or_default().to_string(); -let name = id.clone(); -// Map some fields -let extensions = v.get(&serde_yaml::Value::from("extensions")).and_then(|x| x.as_sequence()).map(|seq| { - seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() -}).unwrap_or_default(); +let name = k.as_str().unwrap_or_default().to_string(); +let id = name.to_lowercase().replace(' ', "-"); -let aliases = v.get(&serde_yaml::Value::from("aliases")).and_then(|x| x.as_sequence()).map(|seq| { - seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() -}).unwrap_or_default(); - -let mime_types = v.get(&serde_yaml::Value::from("mime_types")).and_then(|x| x.as_sequence()).map(|seq| { - seq.iter().filter_map(|e| e.as_str().map(|s| s.to_string())).collect() -}).unwrap_or_default(); - -let tree_sitter_language = v.get(&serde_yaml::Value::from("tree_sitter_language")).and_then(|x| x.as_str()).map(|s| s.to_string()); +let entry: LinguistEntry = match serde_yaml::from_value(v.clone()) { + Ok(e) => e, + Err(_) => continue, // Skip entries that don't match our struct +}; snapshots.push(SnapshotEntry { id, name, - extensions, - aliases, - tree_sitter_language, + extensions: entry.extensions.unwrap_or_default(), + aliases: entry.aliases.unwrap_or_default(), + tree_sitter_language: entry.tree_sitter_language, rca_supported: false, - ast_grep_supported: true, - mime_types, + ast_grep_supported: true, // Default to true for now + mime_types: entry.mime_types.unwrap_or_default(), family: None, is_compiled: false, - language_type: "programming".to_string(), + language_type: entry._type.unwrap_or_else(|| "programming".to_string()), pattern_signatures: serde_json::Value::Null, }); Apply / Chat Suggestion importance[1-10]: 7 __ Why: The suggestion correctly identifies that using serde_yaml::from_value is more idiomatic and robust than manual field extraction, improving code quality and maintainability.	Medium
Possible issue	✅ Improve JSON validation to check all elements Suggestion Impact: The commit changed the jq check from validating only the first element to validating all elements, adding even stricter checks (non-empty string types) and improved error output. code diff: + # ensure every object has non-empty string id and name fields + if ! jq -e 'all(.[]; (has("id") and has("name") and (.id|type=="string") and (.name|type=="string") and (.id != "") and (.name != "")))' "$OUT" >/dev/null; then + echo "Snapshot validation failed: one or more entries are missing required fields 'id' or 'name', or they are empty/non-string" + # Show up to first 5 offending entries + jq 'map(select( (has("id")|not) or (has("name")|not) or (.id|type!="string") or (.name|type!="string") or (.id=="") or (.name=="") )) | .[0:5]' "$OUT" || true Improve the jq validation to check that all elements in the snapshot JSON array are objects with id and name fields, not just the first element. .github/workflows/publish-snapshot.yml [76-81] # ensure each object has id and name fields -if ! jq -e '.[0] | has("id") and has("name")' "$OUT" >/dev/null; then - echo "Snapshot entries appear to be missing required fields (id/name)" - jq '.[0]' "$OUT" || true +if ! jq -e 'all(type == "object" and has("id") and has("name"))' "$OUT" >/dev/null; then + echo "Snapshot is invalid: entries must be objects with id and name fields" + jq . "$OUT" || true exit 1 fi [Suggestion processed] Suggestion importance[1-10]: 7 __ Why: The suggestion correctly identifies a flaw in the validation logic where only the first element of the JSON array is checked, and it provides a more robust solution using jq's all function to validate every element.	Medium
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[chatgpt-codex-connector]

Derive adds serde bounds missing for atomic fields

The newly added atomics in LanguageInfo are still deriving Serialize/Deserialize, but AtomicBool and AtomicU32 do not implement those serde traits. The derive therefore cannot compile – the compiler will emit the trait Serialize is not implemented for AtomicBool (same for AtomicU32). Because this struct is used throughout the crate, the entire crate fails to build. Either drop the serde derives from LanguageInfo and rely on the new LanguageInfoSnapshot, or provide custom serialization helpers for the atomic fields.

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CI Feedback 🧐

(Feedback updated until commit c44b5f4)

A test triggered by this PR failed. Here is an AI-generated analysis of the failure:

Action: CI Success

Failed stage: Check All Jobs [❌]

Failure summary: The action failed due to a gating step that exits on failed critical checks: - The conditional block if [[ "failure" != "success" ]]; then evaluated to true, triggering the message ❌ Nix checks failed and calling exit 1. - As a result, the job terminated with exit code 1 before printing ✅ All critical checks passed!. - This indicates the prior Nix-related checks were marked as failure in the workflow’s environment/status, causing the failure gate to stop the job.

Relevant error logs: 1: ##[group]Runner Image Provisioner 2: Hosted Compute Agent ... 26: Metadata: read 27: Models: read 28: Packages: write 29: Pages: write 30: PullRequests: write 31: RepositoryProjects: write 32: SecurityEvents: write 33: Statuses: write 34: ##[endgroup] 35: Secret source: Actions 36: Prepare workflow directory 37: Prepare all required actions 38: Complete job name: CI Success 39: ##[group]Run if [[ "failure" != "success" ]]; then 40: �[36;1mif [[ "failure" != "success" ]]; then�[0m 41: �[36;1m echo "❌ Nix checks failed"�[0m 42: �[36;1m exit 1�[0m 43: �[36;1mfi�[0m 44: �[36;1mif [[ "skipped" != "success" && "skipped" != "skipped" ]]; then�[0m 45: �[36;1m echo "❌ MSRV check failed"�[0m 46: �[36;1m exit 1�[0m 47: �[36;1mfi�[0m 48: �[36;1mecho "✅ All critical checks passed!"�[0m 49: shell: /usr/bin/bash -e {0} 50: ##[endgroup] 51: ❌ Nix checks failed 52: ##[error]Process completed with exit code 1. 53: Cleaning up orphan processes