tooyoung:codebase-stats

Codebase Stats

Count lines of code with auto-detected project structure. No external tools required.

Tools to use: Bash for file discovery and counting, Glob and Read for config file detection. Do NOT use cloc, tokei, scc, or any external LOC counter.

Activation

Trigger on:

• /codebase-stats or /loc
• "count lines of code", "LOC by module", "code stats", "project size"

Execution Flow

Step 1: Detect Project Structure

Use Glob and Read to inspect config files at the project root. Follow this decision tree in order (first match wins):

1a. JS/TS Workspace Monorepo

Signal files: pnpm-workspace.yaml, turbo.json, nx.json, lerna.json, or root package.json containing "workspaces"

Module extraction:

• pnpm-workspace.yaml: read packages globs, expand with Glob
• package.json workspaces: read array, expand globs
• Each directory with its own package.json = one module
• Label: workspace

1b. Rust Workspace

Signal: root Cargo.toml containing [workspace]

Module extraction: parse members array, expand globs. Label: workspace

1c. Java / Kotlin Multi-Module

Signal: root pom.xml with <modules>, or settings.gradle / settings.gradle.kts

Module extraction:

• Maven: parse <module> tags
• Gradle: parse include(...) or include '...', convert :a:b to a/b
• Label: maven-module or gradle-module

1d. Go Multi-Module

Signal: go.mod found in 2+ directories

Module extraction: each directory containing go.mod = one module. Label: go-module

1e. Python Multi-Package

Signal: pyproject.toml or setup.py found in 2+ directories

Module extraction: each directory containing either file = one module. Label: py-package

1f. Full-Stack Monolith

Signal: top-level directory pairs matching known patterns:

• src + src-tauri (Tauri)
• frontend + backend
• client + server
• web + api
• app + server

Module extraction: each matched directory = one module. Label: monolith

1g. Simple Single-Module

Fallback: none of the above matched.

Module: project root as the only module. Label: single

Always: add a <root> pseudo-module for files in the project root not belonging to any detected module.

Step 2: Count Lines

Run a single Bash script. The counting logic:

# Template - adapt ROOT, MODULES, PRUNE_DIRS as needed

find "$ROOT" \
  \( -name .git -o -name node_modules -o -name target -o -name dist \
     -o -name build -o -name out -o -name coverage -o -name .next \
     -o -name .nuxt -o -name .svelte-kit -o -name .turbo -o -name .cache \
     -o -name __pycache__ -o -name .venv -o -name venv -o -name .mypy_cache \
     -o -name .pytest_cache -o -name vendor -o -name third_party \
     -o -name .yarn -o -name .pnpm-store -o -name Pods -o -name DerivedData \
     -o -name .gradle -o -name .idea -o -name .vscode -o -name .settings \
     -o -name gen -o -name generated \
     -o -name bin -o -name obj -o -name tmp -o -name temp \
  \) -prune -o \
  -type f ! -name '*.min.js' ! -name '*.min.css' ! -name '*.bundle.js' \
  ! -name '*.map' ! -name '*.snap' ! -name '*.lock' ! -name '*.d.ts' \
  ! -name 'package-lock.json' ! -name 'pnpm-lock.yaml' ! -name 'go.sum' \
  ! -name '*.pb.go' ! -name '*_pb2.py' \
  ! -name '*.generated.*' ! -name '*.gen.*' ! -name '*.g.dart' \
  ! -name '*.designer.*' \
  -print0 | \
while IFS= read -r -d '' f; do
  # skip symlinks
  [ -L "$f" ] && continue
  # skip binary
  grep -qI . "$f" 2>/dev/null || continue
  # get extension or basename for extensionless files
  base=$(basename "$f")
  case "$base" in
    Makefile|Dockerfile|Vagrantfile|Rakefile|Gemfile|Justfile|CMakeLists.txt) ext="$base" ;;
    *.*) ext="${base##*.}" ;;
    *) ext="$base" ;;
  esac
  # count
  lines=$(wc -l < "$f" 2>/dev/null) || continue
  loc=$(grep -cve '^[[:space:]]*$' "$f" 2>/dev/null || echo 0)
  # output: path<TAB>ext<TAB>lines<TAB>loc
  printf '%s\t%s\t%d\t%d\n' "$f" "$ext" "$lines" "$loc"
done

File type mapping: Apply this extension-to-type table to classify each file:

Type	Extensions
ts	.ts
tsx	.tsx
js	.js, .mjs, .cjs
jsx	.jsx
py	.py
rs	.rs
go	.go
java	.java
kt	.kt, .kts
swift	.swift
c	.c
cpp	.cc, .cpp, .cxx
h	.h, .hh, .hpp, .hxx
css	.css, .scss, .sass, .less
html	.html, .htm
sql	.sql
sh	.sh, .bash, .zsh, .fish
toml	.toml
json	.json, .jsonc
yaml	.yml, .yaml
xml	.xml
md	.md, .mdx
vue	.vue
svelte	.svelte
dart	.dart
rb	.rb
php	.php
cs	.cs
scala	.scala
elixir	.ex, .exs
docker	Dockerfile
make	Makefile, CMakeLists.txt

Unmatched extensions: group into other. Skip known non-source: .png, .jpg, .jpeg, .gif, .svg, .ico, .pdf, .woff, .woff2, .ttf, .eot, .mp3, .mp4, .webm, .webp, .zip, .tar, .gz, .dmg, .exe, .dll, .so, .dylib, .DS_Store.

Module assignment: for each file path, find the longest-matching module root prefix. Files not matching any module go to <root>.

Step 3: Render Output

Language: Match the user's prompt language. If the user writes in Chinese, use Chinese table headers and labels (e.g., "扫描根目录", "文件类型", "模块", "占比"). If in English, use English. Technical terms (module names, file types, paths) stay as-is regardless of language.

Produce four Markdown tables in this exact order:

Table 1: Project Summary

| Metric                   | Value                       |
| ------------------------ | --------------------------- |
| Scan Root                | `/path/to/project`          |
| Structure                | `monorepo (pnpm workspace)` |
| Modules                  | 5                           |
| Source Files             | 842                         |
| LOC (non-empty)          | 59,040                      |
| Total Lines              | 72,318                      |
| Skipped (binary/symlink) | 12                          |

Table 2: By File Type

Sorted by LOC descending.

| Type | Files |    LOC |  Lines | Share |
| ---- | ----: | -----: | -----: | ----: |
| ts   |   120 | 18,420 | 22,510 | 31.2% |
| tsx  |    44 |  9,720 | 11,300 | 16.5% |
| rs   |    28 |  5,180 |  6,420 |  8.8% |
| css  |    15 |  2,340 |  2,890 |  4.0% |
| ...  |       |        |        |       |

Share = LOC / total LOC * 100, 1 decimal place.

Table 3: By Module

Sorted by LOC descending.

| Module        | Kind      | Files |    LOC | Share | Top Types              |
| ------------- | --------- | ----: | -----: | ----: | ---------------------- |
| packages/core | workspace |   210 | 25,110 | 42.5% | ts(10.2k), tsx(9.7k)   |
| packages/ui   | workspace |   160 | 18,890 | 32.0% | tsx(15.4k), css(1.9k)  |
| <root>        | root      |    18 |  1,320 |  2.2% | json(0.5k), yaml(0.4k) |

Top Types: top 3 file types by LOC within the module, formatted as type(Xk) using abbreviation (e.g., 1.2k for 1,200).

Table 4: Module x Type Detail (Top 20)

Only show if multiple modules detected. Sorted by LOC descending, capped at 20 rows.

| Module        | Type | Files |    LOC |
| ------------- | ---- | ----: | -----: |
| packages/core | ts   |    95 | 12,340 |
| packages/core | tsx  |    75 | 10,210 |
| packages/ui   | tsx  |    88 | 15,420 |

If more than 20 combinations exist, append: Showing top 20 of N combinations.

Number Formatting

• Use thousand separators for numbers >= 1,000 (e.g., 59,040)
• Percentages: 1 decimal place (e.g., 31.2%)
• Abbreviated form in Top Types: 1.2k for 1,200

Edge Cases

Case	Behavior
Empty project	Show summary with zeros, note "No source files found"
Symlinks	Never follow, count in "Skipped"
Binary files with source extension	Detect via grep -qI, skip, count in "Skipped"
Very large repo (>10k files)	Print warning before counting, continue normally
Permission errors	Skip file, increment "Skipped" count
Nested monorepo (workspace inside workspace)	Use deepest module root (longest prefix match)
Generated directories (gen/, generated/)	Exclude by default
other share > 15%	Warn user to review unmapped extensions

Performance Tips

• Always use find -prune to skip heavy directories early
• Process files in a single find | while read loop, not per-file tool calls
• Aggregate with awk or sort | uniq -c, not per-row processing
• Use Read only for config files (manifests), never for source files
• For repos with >5,000 files, run counting in a single Bash invocation