From aab5226dfe937861c54729744e8add15d931f758 Mon Sep 17 00:00:00 2001
From: jao <jao@gnu.org>
Date: Mon, 20 Jul 2020 04:41:00 +0100
Subject: geiser -> src

---
 src/geiser/modules.scm | 104 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/geiser/modules.scm

(limited to 'src/geiser/modules.scm')

diff --git a/src/geiser/modules.scm b/src/geiser/modules.scm
new file mode 100644
index 0000000..32b0f1f
--- /dev/null
+++ b/src/geiser/modules.scm
@@ -0,0 +1,104 @@
+;;; modules.scm -- module metadata
+
+;; Copyright (C) 2009, 2010, 2011, 2018 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Mon Mar 02, 2009 02:00
+
+(define-module (geiser modules)
+  #:export (symbol-module
+            program-module
+            module-name?
+            module-path
+            find-module
+            all-modules
+            submodules
+            module-location)
+  #:use-module (geiser utils)
+  #:use-module (system vm program)
+  #:use-module (system vm debug)
+  #:use-module (ice-9 regex)
+  #:use-module (ice-9 session)
+  #:use-module (srfi srfi-1))
+
+;; Return hash table mapping filename to list of modules defined in that
+;; file. H/t andy wingo.
+(define (fill-file->module-mapping! ret)
+  (define (record-module m)
+    (let ((f (module-filename m)))
+      (hash-set! ret f (cons m (hash-ref ret f '())))))
+  (define (visit-module m)
+    (record-module m)
+    (hash-for-each (lambda (k v) (visit-module v))
+                   (module-submodules m)))
+  (visit-module (resolve-module '() #f))
+  ret)
+
+(define file->modules (fill-file->module-mapping! (make-hash-table)))
+
+(define (program-file p)
+  (let ((src (program-source p 0)))
+    (and (pair? src) (cadr src))))
+
+(define (program-module p)
+  (let* ((f (program-file p))
+         (mods (or (hash-ref file->modules f)
+                   (hash-ref (fill-file->module-mapping! file->modules) f))))
+    (and (pair? mods) (not (null? mods)) (car mods))))
+
+(define (module-name? module-name)
+  (and (list? module-name)
+       (not (null? module-name))
+       (every symbol? module-name)))
+
+(define (symbol-module sym . all)
+  (and sym
+       (catch 'module-name
+         (lambda ()
+           (apropos-fold (lambda (module name var init)
+                           (if (eq? name sym)
+                               (throw 'module-name (module-name module))
+                               init))
+                         #f
+                         (regexp-quote (symbol->string sym))
+                         (if (or (null? all) (not (car all)))
+                             (apropos-fold-accessible (current-module))
+                             apropos-fold-all)))
+         (lambda (key . args)
+           (and (eq? key 'module-name) (car args))))))
+
+(define (module-location name)
+  (make-location (module-path name) #f))
+
+(define (find-module mod-name)
+  (and (module-name? mod-name)
+       (resolve-module mod-name #f #:ensure #f)))
+
+(define (module-path module-name)
+  (and (module-name? module-name)
+       (or ((@@ (ice-9 session) module-filename) module-name)
+           (module-filename (resolve-module module-name #f)))))
+
+(define (submodules mod)
+  (hash-map->list (lambda (k v) v) (module-submodules mod)))
+
+(define (root-modules)
+  (submodules (resolve-module '() #f)))
+
+(define (all-modules)
+  (define (maybe-name m)
+    (and (module-kind m) (format #f "~A" (module-name m))))
+  (let* ((guile (resolve-module '(guile)))
+         (roots (remove (lambda (m) (eq? m guile)) (root-modules)))
+         (children (append-map all-child-modules roots)))
+    (cons "(guile)" (filter-map maybe-name children))))
+
+(define* (all-child-modules mod #:optional (seen '()))
+  (let ((cs (filter (lambda (m) (not (member m seen))) (submodules mod))))
+    (fold (lambda (m all) (append (all-child-modules m all) all))
+          (list mod)
+          cs)))
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