feat(go): Add Go ecosystem support - Complete (Phases 1-4)

.github/workflows/ci.yml

@@ -215,7 +215,7 @@ jobs:
       - name: Generate per-crate coverage
         run: |
           # Generate coverage for each crate separately
-          for crate in deps-core deps-cargo deps-npm deps-pypi deps-lsp; do
+          for crate in deps-core deps-cargo deps-npm deps-pypi deps-go deps-lsp; do
             echo "Generating coverage for $crate..."
             cargo llvm-cov --all-features --package "$crate" --lcov \
               --output-path "lcov-$crate.info" nextest 2>/dev/null || true
@@ -261,6 +261,14 @@ jobs:
           flags: deps-pypi
           fail_ci_if_error: false
 
+      - name: Upload deps-go coverage
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: lcov-deps-go.info
+          flags: deps-go
+          fail_ci_if_error: false
+
       - name: Upload deps-lsp coverage
         uses: codecov/codecov-action@v5
         with:

.gitignore

@@ -14,6 +14,7 @@ target
 
 # Testing
 .snapshots/
+**/snapshots/
 
 # Local development
 .local/

Cargo.toml

@@ -19,6 +19,7 @@ deps-core = { version = "0.4.1", path = "crates/deps-core" }
 deps-cargo = { version = "0.4.1", path = "crates/deps-cargo" }
 deps-npm = { version = "0.4.1", path = "crates/deps-npm" }
 deps-pypi = { version = "0.4.1", path = "crates/deps-pypi" }
+deps-go = { version = "0.4.1", path = "crates/deps-go" }
 deps-lsp = { version = "0.4.1", path = "crates/deps-lsp" }
 futures = "0.3"
 insta = "1"
@@ -28,6 +29,7 @@ once_cell = "1.20"
 pep440_rs = "0.7"
 pep508_rs = "0.9"
 bytes = "1"
+regex = "1"
 reqwest = { version = "0.12", default-features = false }
 semver = "1"
 serde = "1"

README.md

@@ -14,7 +14,7 @@ A universal Language Server Protocol (LSP) server for dependency management acro
 
 - **Intelligent Autocomplete** — Package names, versions, and feature flags
 - **Version Hints** — Inlay hints showing latest available versions
-- **Lock File Support** — Reads resolved versions from Cargo.lock, package-lock.json, poetry.lock, uv.lock
+- **Lock File Support** — Reads resolved versions from Cargo.lock, package-lock.json, poetry.lock, uv.lock, go.sum
 - **Diagnostics** — Warnings for outdated, unknown, or yanked dependencies
 - **Hover Information** — Package descriptions with resolved version from lock file
 - **Code Actions** — Quick fixes to update dependencies
@@ -43,10 +43,14 @@ deps-lsp is optimized for responsiveness:
 | Rust/Cargo | `Cargo.toml` | ✅ Supported |
 | npm | `package.json` | ✅ Supported |
 | Python/PyPI | `pyproject.toml` | ✅ Supported |
+| Go Modules | `go.mod` | ✅ Supported |
 
 > [!NOTE]
 > PyPI support includes PEP 621, PEP 735 (dependency-groups), and Poetry formats.
 
+> [!NOTE]
+> Go support includes require, replace, and exclude directives with pseudo-version handling.
+
 ## Installation
 
 ### From crates.io
@@ -185,6 +189,7 @@ deps-lsp/
 │   ├── deps-cargo/     # Cargo.toml parser + crates.io registry
 │   ├── deps-npm/       # package.json parser + npm registry
 │   ├── deps-pypi/      # pyproject.toml parser + PyPI registry
+│   ├── deps-go/        # go.mod parser + proxy.golang.org
 │   ├── deps-lsp/       # Main LSP server
 │   └── deps-zed/       # Zed extension (WASM)
 ├── .config/            # nextest configuration

crates/deps-core/README.md

@@ -7,7 +7,7 @@
 
 Core abstractions for deps-lsp: traits, caching, and generic LSP handlers.
 
-This crate provides the shared infrastructure used by ecosystem-specific crates (`deps-cargo`, `deps-npm`, `deps-pypi`).
+This crate provides the shared infrastructure used by ecosystem-specific crates (`deps-cargo`, `deps-npm`, `deps-pypi`, `deps-go`).
 
 ## Features
 

crates/deps-go/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "deps-go"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Go module support for deps-lsp"
+
+[dependencies]
+deps-core = { workspace = true }
+async-trait.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+thiserror.workspace = true
+tokio.workspace = true
+tower-lsp-server.workspace = true
+tracing.workspace = true
+regex.workspace = true
+once_cell.workspace = true
+semver.workspace = true
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["macros", "rt"] }
+tokio-test.workspace = true
+tempfile.workspace = true

crates/deps-go/README.md

@@ -0,0 +1,74 @@
+# deps-go
+
+[![Crates.io](https://img.shields.io/crates/v/deps-go)](https://crates.io/crates/deps-go)
+[![docs.rs](https://img.shields.io/docsrs/deps-go)](https://docs.rs/deps-go)
+[![codecov](https://codecov.io/gh/bug-ops/deps-lsp/graph/badge.svg?token=S71PTINTGQ&flag=deps-go)](https://codecov.io/gh/bug-ops/deps-lsp)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](../../LICENSE)
+
+Go modules support for deps-lsp.
+
+This crate provides parsing and registry integration for Go's module ecosystem.
+
+## Features
+
+- **go.mod Parsing** — Parse `go.mod` with position tracking for all directives
+- **Directive Support** — Handle `require`, `replace`, `exclude`, and `retract` directives
+- **Indirect Dependencies** — Detect and mark indirect dependencies (`// indirect`)
+- **Pseudo-versions** — Parse and validate Go pseudo-version format
+- **proxy.golang.org** — Fetch module versions from Go module proxy
+- **Module Path Escaping** — Proper URL encoding for uppercase characters
+- **EcosystemHandler** — Implements `deps_core::EcosystemHandler` trait
+
+## Usage
+
+```toml
+[dependencies]
+deps-go = "0.4"
+```
+
+```rust
+use deps_go::{parse_go_mod, GoRegistry};
+
+let dependencies = parse_go_mod(content, &uri)?;
+let registry = GoRegistry::new(cache);
+let versions = registry.get_versions("github.com/gin-gonic/gin").await?;
+```
+
+## Supported Directives
+
+### require
+
+```go
+require github.com/gin-gonic/gin v1.9.1
+require (
+    github.com/stretchr/testify v1.8.4
+    golang.org/x/sync v0.5.0 // indirect
+)
+```
+
+### replace
+
+```go
+replace github.com/old/module => github.com/new/module v1.0.0
+replace github.com/local/module => ../local/module
+```
+
+### exclude
+
+```go
+exclude github.com/pkg/module v1.2.3
+```
+
+## Pseudo-version Support
+
+Handles Go's pseudo-version format for unreleased commits:
+
+```
+v0.0.0-20191109021931-daa7c04131f5
+```
+
+Extracts base version and timestamp for display.
+
+## License
+
+[MIT](../../LICENSE)