From f16fb42db676303292de5cd9063d0f21f0baceeb Mon Sep 17 00:00:00 2001
From: Pierre Langlois <pierre.langlois@gmx.com>
Date: Tue, 29 Mar 2022 20:13:34 +0100
Subject: [PATCH v6 03/27] build-system: Add tree-sitter-build-system.

* guix/build-system/tree-sitter.scm: New module.
* guix/build/tree-sitter-build-system.scm: Likewise.
* Makefile.am (MODULES): Add them.
* doc/guix.texi: Document it.
---
 Makefile.am                             |   2 +
 doc/guix.texi                           |  21 ++-
 guix/build-system/tree-sitter.scm       | 190 ++++++++++++++++++++++++
 guix/build/tree-sitter-build-system.scm | 153 +++++++++++++++++++
 4 files changed, 365 insertions(+), 1 deletion(-)
 create mode 100644 guix/build-system/tree-sitter.scm
 create mode 100644 guix/build/tree-sitter-build-system.scm

diff --git a/Makefile.am b/Makefile.am
index 85a22be99c..de5cdbd328 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -168,6 +168,7 @@ MODULES =					\
   guix/build-system/ruby.scm			\
   guix/build-system/scons.scm			\
   guix/build-system/texlive.scm			\
+  guix/build-system/tree-sitter.scm		\
   guix/build-system/trivial.scm			\
   guix/ftp-client.scm				\
   guix/http-client.scm				\
@@ -221,6 +222,7 @@ MODULES =					\
   guix/build/ruby-build-system.scm		\
   guix/build/scons-build-system.scm		\
   guix/build/texlive-build-system.scm		\
+  guix/build/tree-sitter-build-system.scm	\
   guix/build/waf-build-system.scm		\
   guix/build/haskell-build-system.scm		\
   guix/build/julia-build-system.scm		\
diff --git a/doc/guix.texi b/doc/guix.texi
index e1fb50a634..1783d74551 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -79,7 +79,7 @@ Copyright @copyright{} 2020 Jack Hill@*
 Copyright @copyright{} 2020 Naga Malleswari@*
 Copyright @copyright{} 2020, 2021 Brice Waegeneire@*
 Copyright @copyright{} 2020 R Veera Kumar@*
-Copyright @copyright{} 2020, 2021 Pierre Langlois@*
+Copyright @copyright{} 2020, 2021, 2022 Pierre Langlois@*
 Copyright @copyright{} 2020 pinoaffe@*
 Copyright @copyright{} 2020 André Batista@*
 Copyright @copyright{} 2020, 2021 Alexandru-Sergiu Marton@*
@@ -9281,6 +9281,25 @@ be specified with the @code{#:node} parameter which defaults to
 @code{node}.
 @end defvr
 
+@defvr {Scheme Variable} tree-sitter-build-system
+
+This variable is exported by @code{(guix build-system tree-sitter)}.  It
+implements procedures to compile grammars for the
+@url{https://tree-sitter.github.io/tree-sitter/, Tree-sitter} parsing
+library.  It essentially runs @code{tree-sitter generate} to translate
+@code{grammar.js} grammars to JSON and then to C.  Which it then
+compiles to native code.
+
+Tree-sitter packages may support multiple grammars, so this build system
+supports a @code{#:grammar-directories} keyword to specify a list of
+locations where a @code{grammar.js} file may be found.
+
+Grammars sometimes depend on each other, such as C++ depending on C and
+TypeScript depending on JavaScript.  You may use inputs to declare such
+dependencies.
+
+@end defvr
+
 Lastly, for packages that do not need anything as sophisticated, a
 ``trivial'' build system is provided.  It is trivial in the sense that
 it provides basically no support: it does not pull any implicit inputs,
diff --git a/guix/build-system/tree-sitter.scm b/guix/build-system/tree-sitter.scm
new file mode 100644
index 0000000000..aeb96e3ef5
--- /dev/null
+++ b/guix/build-system/tree-sitter.scm
@@ -0,0 +1,190 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Pierre Langlois <pierre.langlois@gmx.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system tree-sitter)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix build-system node)
+  #:use-module (ice-9 match)
+  #:export (%tree-sitter-build-system-modules
+            tree-sitter-build
+            tree-sitter-build-system))
+
+(define %tree-sitter-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build tree-sitter-build-system)
+    ,@%node-build-system-modules))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME from the given arguments."
+  (define private-keywords
+    `(#:inputs #:native-inputs #:outputs ,@(if target
+                                               '()
+                                               '(#:target))))
+  (define node
+    (module-ref (resolve-interface '(gnu packages node))
+                'node-lts))
+  (define tree-sitter
+    (module-ref (resolve-interface '(gnu packages tree-sitter))
+                'tree-sitter))
+  (define tree-sitter-cli
+    (module-ref (resolve-interface '(gnu packages tree-sitter))
+                'tree-sitter-cli))
+  ;; Grammars depend on each other via JS modules, which we package into a
+  ;; dedicated js output.
+  (define grammar-inputs
+    (map (match-lambda
+           ((name package)
+            `(,name ,package "js")))
+         inputs))
+  (bag
+    (name name)
+    (system system) (target target)
+    (build-inputs `(,@(if source
+                          `(("source" ,source))
+                          '())
+                    ("node" ,node)
+                    ("tree-sitter-cli" ,tree-sitter-cli)
+                    ,@native-inputs
+                    ,@(if target '() grammar-inputs)
+                    ;; Keep the standard inputs of 'gnu-build-system'.
+                    ,@(if target
+                          (standard-cross-packages target 'host)
+                          '())
+                    ,@(standard-packages)))
+    (host-inputs `(("tree-sitter" ,tree-sitter)
+                   ,@(if target grammar-inputs '())))
+    ;; Keep the standard inputs of 'gnu-buid-system'.
+    (target-inputs (if target
+                       (standard-cross-packages target 'target)
+                       '()))
+    ;; XXX: this is a hack to get around issue #41569.
+    (outputs (match outputs
+               (("out") (cons "js" outputs))
+               (_ outputs)))
+    (build (if target tree-sitter-cross-build tree-sitter-build))
+    (arguments (strip-keyword-arguments private-keywords arguments))))
+
+(define* (tree-sitter-build name inputs
+                            #:key
+                            source
+                            (phases '%standard-phases)
+                            (grammar-directories '("."))
+                            (tests? #t)
+                            (outputs '("out" "js"))
+                            (search-paths '())
+                            (system (%current-system))
+                            (guile #f)
+                            (imported-modules %tree-sitter-build-system-modules)
+                            (modules '((guix build utils)
+                                       (guix build tree-sitter-build-system))))
+  (define builder
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@(sexp->gexp modules))
+          (tree-sitter-build #:name #$name
+                             #:source #+source
+                             #:system #$system
+                             #:phases #$phases
+                             #:tests? #$tests?
+                             #:grammar-directories '#$grammar-directories
+                             #:outputs #$(outputs->gexp outputs)
+                             #:search-paths '#$(sexp->gexp
+                                                (map search-path-specification->sexp
+                                                     search-paths))
+                             #:inputs #$(input-tuples->gexp inputs)))))
+
+  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
+                                                  system #:graft? #f)))
+    (gexp->derivation name builder
+                      #:system system
+                      #:guile-for-build guile)))
+
+(define* (tree-sitter-cross-build name
+                                  #:key
+                                  target
+                                  build-inputs target-inputs host-inputs
+                                  guile source
+                                  (phases '%standard-phases)
+                                  (grammar-directories '("."))
+                                  (tests? #t)
+                                  (outputs '("out" "js"))
+                                  (search-paths '())
+                                  (native-search-paths '())
+                                  (system (%current-system))
+                                  (build (nix-system->gnu-triplet system))
+                                  (imported-modules %tree-sitter-build-system-modules)
+                                  (modules '((guix build utils)
+                                             (guix build tree-sitter-build-system))))
+  (define builder
+    (with-imported-modules imported-modules
+      #~(begin
+          (use-modules #$@(sexp->gexp modules))
+
+          (define %build-host-inputs
+            #+(input-tuples->gexp build-inputs))
+
+          (define %build-target-inputs
+            (append #$(input-tuples->gexp host-inputs)
+                    #+(input-tuples->gexp target-inputs)))
+
+          (define %build-inputs
+            (append %build-host-inputs %build-target-inputs))
+
+          (tree-sitter-build #:name #$name
+                             #:source #+source
+                             #:system #$system
+                             #:build #$build
+                             #:target #$target
+                             #:phases #$phases
+                             #:tests? #$tests?
+                             #:grammar-directories '#$grammar-directories
+                             #:outputs #$(outputs->gexp outputs)
+                             #:inputs %build-target-inputs
+                             #:native-inputs %build-host-inputs
+                             #:search-paths '#$(sexp->gexp
+                                                (map search-path-specification->sexp
+                                                     search-paths))
+                             #:native-search-paths '#$(sexp->gexp
+                                                       (map
+                                                        search-path-specification->sexp
+                                                        native-search-paths))))))
+
+  (mlet %store-monad ((guile (package->derivation (or guile (default-guile))
+                                                  system #:graft? #f)))
+    (gexp->derivation name builder
+                      #:system system
+                      #:target target
+                      #:guile-for-build guile)))
+
+(define tree-sitter-build-system
+  (build-system
+    (name 'tree-sitter)
+    (description "The Tree-sitter grammar build system")
+    (lower lower)))
+
+;;; tree-sitter.scm ends here
diff --git a/guix/build/tree-sitter-build-system.scm b/guix/build/tree-sitter-build-system.scm
new file mode 100644
index 0000000000..ad59f56dfe
--- /dev/null
+++ b/guix/build/tree-sitter-build-system.scm
@@ -0,0 +1,153 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Pierre Langlois <pierre.langlois@gmx.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build tree-sitter-build-system)
+  #:use-module ((guix build node-build-system) #:prefix node:)
+  #:use-module (guix build json)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 regex)
+  #:use-module (srfi srfi-1)
+  #:export (%standard-phases
+            tree-sitter-build))
+
+;; Commentary:
+;;
+;; Build procedures for tree-sitter grammar packages.  This is the
+;; builder-side code, which builds on top fo the node build-system.
+;;
+;; Tree-sitter grammars are written in JavaScript and compiled to a native
+;; shared object.  The `tree-sitter generate' command invokes `node' in order
+;; to evaluate the grammar.js into a grammar.json file, which is then
+;; translated into C code.  We then compile the C code ourselve.  Packages
+;; also sometimes add extra manually written C/C++ code.
+;;
+;; In order to support grammars depending on each other, such as C and C++,
+;; JavaScript and TypeScript, this build-system installs the source of the
+;; node module in a dedicated "js" output.
+;;
+;; Code:
+
+(define* (patch-dependencies #:key inputs #:allow-other-keys)
+  "Rewrite dependencies in 'package.json'.  We remove all runtime dependencies
+and replace development dependencies with tree-sitter grammar node modules."
+
+  (define (rewrite package.json)
+    (map (match-lambda
+           (("dependencies" @ . _)
+            '("dependencies" @))
+           (("devDependencies" @ . _)
+            `("devDependencies" @
+              ,@(filter-map (match-lambda
+                              ((key . directory)
+                               (let ((node-module
+                                      (string-append directory
+                                                     "/lib/node_modules/"
+                                                     key)))
+                                 (and (directory-exists? node-module)
+                                      `(,key . ,node-module)))))
+                            (alist-delete "node" inputs))))
+           (other other))
+         package.json))
+
+  (node:with-atomic-json-file-replacement "package.json"
+    (match-lambda
+      (('@ . package.json)
+       (cons '@ (rewrite package.json))))))
+
+;; FIXME: The node build-system's configure phase does not support
+;; cross-compiling so we re-define it.
+(define* (configure #:key native-inputs inputs #:allow-other-keys)
+  (invoke (search-input-file (or native-inputs inputs) "/bin/npm")
+          "--offline" "--ignore-scripts" "install"))
+
+(define* (build #:key grammar-directories #:allow-other-keys)
+  (for-each (lambda (dir)
+              (with-directory-excursion dir
+                ;; Avoid generating binding code for other languages, we do
+                ;; not support this use-case yet and it relies on running
+                ;; `node-gyp' to build native addons.
+                (invoke "tree-sitter" "generate" "--no-bindings")))
+            grammar-directories))
+
+(define* (check #:key grammar-directories tests? #:allow-other-keys)
+  (when tests?
+    (for-each (lambda (dir)
+                (with-directory-excursion dir
+                  (invoke "tree-sitter" "test")))
+              grammar-directories)))
+
+(define* (install #:key target grammar-directories outputs #:allow-other-keys)
+  (let ((lib (string-append (assoc-ref outputs "out")
+                            "/lib/tree-sitter")))
+    (mkdir-p lib)
+    (define (compile-language dir)
+      (with-directory-excursion dir
+        (let ((lang (assoc-ref (call-with-input-file "src/grammar.json"
+                                 read-json)
+                               "name"))
+              (source-file (lambda (path)
+                             (if (file-exists? path)
+                                 path
+                                 #f))))
+          (apply invoke
+                 `(,(if target
+                        (string-append target "-g++")
+                        "g++")
+                   "-shared"
+                   "-fPIC"
+                   "-fno-exceptions"
+                   "-O2"
+                   "-g"
+                   "-o" ,(string-append lib "/" lang ".so")
+                   ;; An additional `scanner.{c,cc}' file is sometimes
+                   ;; provided.
+                   ,@(cond
+                      ((source-file "src/scanner.c")
+                       => (lambda (file) (list "-xc" "-std=c99" file)))
+                      ((source-file "src/scanner.cc")
+                       => (lambda (file) (list file)))
+                      (else '()))
+                   "-xc" "src/parser.c")))))
+    (for-each compile-language grammar-directories)))
+
+(define* (install-js #:key native-inputs inputs outputs #:allow-other-keys)
+  (invoke (search-input-file (or native-inputs inputs) "/bin/npm")
+          "--prefix" (assoc-ref outputs "js")
+          "--global"
+          "--offline"
+          "--loglevel" "info"
+          "--production"
+          ;; Skip scripts to prevent building bindings via GYP.
+          "--ignore-scripts"
+          "install" "../package.tgz"))
+
+(define %standard-phases
+  (modify-phases node:%standard-phases
+    (replace 'patch-dependencies patch-dependencies)
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)
+    (add-after 'install 'install-js install-js)))
+
+(define* (tree-sitter-build #:key inputs (phases %standard-phases)
+                            #:allow-other-keys #:rest args)
+  (apply node:node-build #:inputs inputs #:phases phases args))
+
+;;; tree-sitter-build-system.scm ends here
-- 
2.36.0

