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(zilch lang ninja): document

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Change-Id: I6a6a6964dcc713504ec57f40981a601696a573af
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puck 2025-07-03 18:57:48 +00:00
parent 154ba9be1c
commit 93a1ebba00
11 changed files with 329 additions and 43 deletions
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31
lang/ninja/src/nixpkgs.sld
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@ -1,3 +1,4 @@
;; Helpers to work with Zilch around Nixpkgs derivations.
(define-library (zilch lang ninja nixpkgs)
(import
(scheme base) (chicken format) (scheme lazy)
@ -74,7 +75,23 @@
(set! output (string-copy output 0 32)))
(string-append "/nix/store/" output (string-copy base-placeholder (string-length output)) name (if (string=? output "out") "" (string-append "-" output))))
;; Takes a `<ninja-build-config>` representing a Nixpkgs derivation, and
;; preprocesses the derivation such that it can be reconstituted once Zilch
;; has taken over the Ninja build requirements.
;;
;; This procedure is used internally, and shouldn't be relied upon; it
;; encodes many specific parts that are unlikely to be useful by external
;; parties.
;;
;; Returns 6 values:
;;
;; - The initial Nixpkgs derivation as `<derivation>`
;; - The Nixpkgs derivation after running all phases up to and including
;; configuration
;; - An alist of output names to placeholder store paths
;; - The `edge-ref`, `defaults`, and `export-depfile` values from calling
;; `process-ninja-file`
(define (setup-ninja-environment conf)
(define initial-drv (ninja-build-config-environment-drv conf))
(when (store-path? initial-drv)
@ -125,7 +142,17 @@
(define-values (edge-ref defaults export-depfile) (process-ninja-file ninja-file conf "build"))
(values initial-drv configured-drv placeholders edge-ref defaults export-depfile))
;; Takes a `<ninja-build-config>` representing a Nixpkgs derivation, and
;; build it using Zilch.
;;
;; Returns two values:
;;
;; - An alist of output name to store paths, representing the built
;; derivation
;; - A procedure that, when called, returns a mapping of output path to
;; necessary inputs generated from the depfile data. This can be stored in
;; a file for later rebuilds.
(define (build-nixpkgs-drv-reproducibly conf)
(define-values (initial-drv configured-drv placeholders edge-ref defaults export-depfile) (setup-ninja-environment conf))