# src — Source Tree Root

## Purpose

The source tree root contains all editable source code, build scripts, test suites, VFS payloads, vendor dependencies, and documentation. This is the primary development area.

## Ownership

- The `src/` tree is where agents perform development work.
- Generated/output directories at the project root (`modules/`, `lib/`, `lib_tcl8/`, `lib_tcl9/`, `modules_tcl8/`, `modules_tcl9/`) are build targets — agents must not directly modify them.
- VFS payloads, runtime mappings, vendored dependencies, generated docs, and entry-point scripts have child AGENTS.md files with local ownership rules.

## Local Contracts

- `make.tcl` is the primary build entry point: `tclsh src/make.tcl <command>`.
- The build system handles bootstrap loading, version assignment, module/library packaging, and VFS packaging.
- Shell launcher entry points include `tclsh src/make.tcl shell`, built launchers under the project `bin/` directory, scripts sourced from `src/scriptapps/`, and executable entry scripts under `src/vfs/_config/`.
- Tcl 8.6+ is required and Tcl 9.0 is supported; gate 9.0-specific behavior behind version checks or existing `punk::lib::compat` helpers.
- Primary target is Windows (`win32-x86_64`); Linux, macOS, and FreeBSD are secondary targets.
- Tcl linting is available only through the VS Code Tcl lint plugin configured by `tclint.toml`; do not try to run `tclint` or `tcllint` as shell commands.
- Lint coverage is `.tcl` and `.tm`; extend config if new Tcl-related extensions appear.
- Shared Tcl source formatting defaults are a 400-character line cap, no more than 10 consecutive blank lines, 4-space indentation, and no tabs except inside string literals.
- Source priority for editable modules: `src/modules/` > `src/modules_tcl<major>/` > bootsupport > VFS > built > installed.
- Source priority for editable libraries: `src/lib/` > `src/lib_tcl<major>/` > vendorlib > VFS > built > installed.
- Treat `pkgIndex.tcl` as a loader map unless the task is about package loading or registration.
- Prefer vendored dependencies under `src/vendor*` before fetching new dependencies.
- Guard optional compiled extensions such as `twapi` or `tdom` with fallback behavior or actionable messages.

### File Resolution Policy

Use the strongest available anchor first and do not broaden scope until that anchor is checked.

Treat active-editor anchors in source-derived or generated trees as ambiguous unless the user explicitly named that path. In particular, confirm the intended target before editing files opened under `src/bootsupport/`, root `modules/`, root `lib/`, `modules_tcl8/`, `modules_tcl9/`, `lib_tcl8/`, or `lib_tcl9/`; for generic module/library work, the usual target is `src/modules/`, `src/modules_tcl<major>/`, `src/lib/`, or `src/lib_tcl<major>/`.

Anchor order:

1. Exact path named by the user.
2. Active editor file, when the environment provides one.
3. Exact proc, symbol, or identifier named by the user.
4. Repository naming and source-precedence rules.

Proc inspection order:

1. Read the exact file named by the user, if provided.
2. Otherwise read the active editor file, if provided and relevant.
3. Otherwise search once for the exact proc name.
4. Prefer editable source under `src/modules/`, `src/modules_tcl<major>/`, `src/lib/`, or `src/lib_tcl<major>/`.
5. If multiple matches exist, prefer the generic source tree unless version-specific behavior is relevant or only a version-specific definition exists.
6. If the best hit is `pkgIndex.tcl`, use it to resolve the implementation file.
7. Once the owning source file is identified, continue locally from that file.

Recovery after a wrong path guess:

- Re-check the user-provided path.
- Re-check the active editor file, if available.
- Re-check repo naming conventions.
- Use one exact symbol search instead of probing more filename variants.

## Work Guidance

- Run `tclsh src/make.tcl packages` once after cloning to populate generated module and library assets.
- Use `tclsh src/make.tcl project` for full builds.
- Use `tclsh src/make.tcl modules` to build just the module packages.
- Use `tclsh src/make.tcl libs` to build just the library packages.
- Use `tclsh src/make.tcl packages` to build both modules and libraries.
- Use `tclsh src/make.tcl vendorupdate` to refresh vendormodules from config. It warns (non-fatal) for each source project whose fossil/git checkout is dirty - vendored artifacts built from a dirty tree have no committed provenance; commit in the source project to clear the warning (enforcement policy tracked by goal G-026).
- Use `tclsh src/make.tcl vfscommonupdate` to rebuild `_vfscommon.vfs`.
- Uncommitted `make.tcl`-generated outputs may be batched into one commit, regardless of how many `make.tcl` invocations produced them. This covers punkcheck-managed build outputs that are VCS-tracked: `src/bootsupport/`, `_vfscommon.vfs/modules` + `/lib`, and declared per-kit `*.vfs/lib_tcl<N>/<pkg>` subfolders. (Root `modules/`, `lib/`, `modules_tcl<N>/`, `lib_tcl<N>/` are gitignored and never committed.) Each module's old→new version rename is atomic; a regeneration reflects one build-output refresh, not independent hand-edits. This is a carve-out from generic "split aggressively" commit guidance for punkcheck-managed build outputs only — it does not cover user-curated VFS content (`_config/`, per-kit `*.vfs/` outside declared `lib_tcl<N>` subfolders, `_aside/`, `mkzipfix.vfs`, `_vfscommon.vfs/doc`), which commits separately per its own concerns.
- Use `punk make.tcl project` or `punk902z make.tcl project` inside Punk shell when building binaries through Punk.
- Binary images are platform-specific; build on each target platform rather than expecting a cross-platform flag.
- Remove `_build/` artifacts only when a clean/resync is needed, then rerun the relevant `make.tcl` command. Avoid partial cleans that break boot modules.
- Superseded module intermediates are pruned automatically so payload wrapping inherits clean trees:
  - `punk::mix::cli::lib::prune_superseded_target_modules` runs inside `build_modules_from_source_to_base` after each module install/skip (covers root `modules/`, `modules_tcl8/`, `modules_tcl9/`), and from `make.tcl bootsupport` for non-glob `include_modules.config` entries (glob entries may intentionally track multiple versions and are never pruned).
  - `punk::mix::cli::lib::prune_sourcevanished_targets` mirror-prunes recorded `.tm` targets whose recorded source files no longer exist: project-layout bootsupport copies (installer `punkboot-bootsupport`) and root `modules*/` vendormodule copies (installer `make.tcl`).
  - Every deletion is recorded as a punkcheck DELETE event in the owning `.punkcheck`, so change detection stays consistent. Files without a qualifying punkcheck install record (e.g placed manually) are never deleted — they are reported to stderr and must be removed by hand if unwanted.
  - Install records carry virtual `module_name`/`module_version` SOURCE entries (punkcheck `targetset_addsource_virtual`, punkcheck >= 0.3.0) identifying which product of a source fileset a target is — needed because successive versions are typically built from the same physical source files. Prune trusts this identity; for legacy records it falls back to requiring the candidate's recorded sources to share the keep-version's source folder(s) and module-name prefix.
  - The make.tcl call sites are guarded with `info commands` checks: after changing this tooling itself, the first `make.tcl modules` + `make.tcl bootsupport` pass builds/propagates the new tooling (prune skipped with a stderr note) and the next pass prunes.
- Use `tcl::tm::path add <dir>` to surface project modules when writing focused tooling.
- Review VS Code Tcl lint diagnostics before submitting new agent-produced Tcl code, but do not use lint tooling to reformat existing code.
- When touching VFS payloads, describe regeneration steps in durable docs if the workflow changes.
- When a tool summary reports cleanup issues such as `git diff --check` whitespace errors, verify against exact command output and exit code before running secondary scans or reporting the issue.
- `make.tcl` performs version-aware bootsupport staleness detection: major bumps abort, minor bumps prompt (y/N), patch bumps warn-and-proceed. See `src/bootsupport/AGENTS.md` "Bootsupport Staleness Handling" for the full contract and the version-bump discipline agents must follow.
- Project-level version bumps are governed by the root `AGENTS.md` "Project Versioning" section. Any `src/` change that ships user-visible shell behaviour requires a `punkproject.toml` version bump and a `CHANGELOG.md` entry as part of the DOX closeout pass. Run `tclsh src/make.tcl projectversion` to verify.

## Verification

- VS Code Tcl lint diagnostics are reviewed for modified Tcl files when available.
- Relevant tests pass, either `tclsh src/tests/runtests.tcl` or a specific `tclsh src/tests/modules/<modulehierarchypath>/tests/all.tcl`.
- `tclsh src/make.tcl packages` is verified when touching build-critical code.
- `tclsh src/make.tcl project` completes without errors when changing build, runtime, or VFS behavior.
- Documentation/comments are updated for new behavior, flags, workflow, or ownership rules.
- Diffs are reviewed so no stray whitespace or debugging output remains.

## Child DOX Index

- `modules/` — Main editable module source (see modules/AGENTS.md)
- `modules/punk/` — Core punk namespace modules (see modules/punk/AGENTS.md)
- `modules/test/` — Installed-module test packages (see modules/test/AGENTS.md)
- `modules_tcl8/` — Tcl 8 specific modules (see modules_tcl8/AGENTS.md)
- `modules_tcl9/` — Tcl 9 specific modules (see modules_tcl9/AGENTS.md)
- `lib/` — Editable library source (see lib/AGENTS.md)
- `lib_tcl8/` — Tcl 8 specific libraries
- `lib_tcl9/` — Tcl 9 specific libraries
- `bootsupport/` — Early-load bootstrap modules (see bootsupport/AGENTS.md)
- `tests/` — Source-tree test harness and tests (see tests/AGENTS.md)
- `vfs/` — Virtual file system images for builds (see vfs/AGENTS.md)
- `scriptapps/` — Entry-point scripts for Punk apps (see scriptapps/AGENTS.md)
- `vendormodules/` — Third-party bundled modules (see vendormodules/AGENTS.md)
- `vendorlib/` — Third-party bundled libraries (see vendorlib/AGENTS.md)
- `vendorlib_tcl8/` — Tcl 8 specific vendor libraries
- `vendorlib_tcl9/` — Tcl 9 specific vendor libraries
- `runtime/` — Build runtimes and VFS config (see runtime/AGENTS.md)
- `doc/` — Generated documentation (see doc/AGENTS.md)
- `testansi/` — Sample ANSI art files (do not modify)