From 49f11c4fc5cc30ced8976476ecc081a7ca1b40f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 1 Feb 2022 00:49:51 +0100
Subject: Add script which checks who uses a module.

---
 scripts/module-dependants.scm | 112 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100755 scripts/module-dependants.scm

(limited to 'scripts')

diff --git a/scripts/module-dependants.scm b/scripts/module-dependants.scm
new file mode 100755
index 00000000..f1efb8cc
--- /dev/null
+++ b/scripts/module-dependants.scm
@@ -0,0 +1,112 @@
+#!/usr/bin/guile \
+-e main -s
+!#
+
+(define module-dir (string-append
+                    (dirname (dirname (current-filename)))
+                    "/module"))
+
+(add-to-load-path module-dir)
+(add-to-load-path (dirname (current-filename)))
+
+
+(use-modules (hnh util)
+             (srfi srfi-1)
+             (ice-9 ftw)
+             (texinfo string-utils)
+             (module-introspection))
+
+(define cstat (make-object-property))
+
+
+(define (find-all-files-under directory)
+  (file-system-fold
+   ;; enter?
+   (lambda (path stat result) #t)
+   ;; leaf
+   (lambda (path stat result)
+     (set! (cstat path) stat)
+     (cons path result))
+   ;; down
+   (lambda (path stat result)
+     (set! (cstat path) stat)
+     (cons path result))
+   ;; up
+   (lambda (path state result) result)
+   ;; skip
+   (lambda (path stat result) result)
+   ;; error
+   (lambda (path stat errno result) result)
+   '() directory))
+
+(define (regular-file? filename)
+  (eq? 'regular (stat:type (cstat filename))))
+
+(define (filename-extension ext)
+  (let ((re (make-regexp (string-append ((@ (texinfo string-utils)
+                                            escape-special-chars)
+                                         ext "^$[]()*." #\\)
+                                        "$") regexp/icase)))
+    (lambda (filename) (regexp-exec re filename))))
+
+
+(define (main args)
+  ;; TODO this needs to be an absolute filename, for the remove below to work
+  ;; Fix this once `realpath' is written
+  (define target-file (cadr args))
+  (define target-forms
+    (reverse (call-with-input-file target-file get-forms)))
+  (define target-module
+    (find-module-declaration target-forms))
+  ;; (define target-symbols (unique-symbols target-forms))
+  ;; (write target-module) (newline)
+
+  (define edges
+   (concatenate
+    (map (lambda (file)
+           (define forms (call-with-input-file file get-forms))
+           (define module (and=> (-> forms find-module-declaration) resolve-module))
+           (define source-symbols (unique-symbols forms))
+
+           (when module
+             (awhen (find (lambda (module)
+                            (equal? target-module
+                                    (module-name module)))
+                          (module-uses module))
+                    (let ((module-symbols (module-map (lambda (key value) key) it)))
+                      ;; (display "    ")
+                      (map (lambda (symb)
+                             (cons file symb))
+                           (lset-intersection eq? source-symbols module-symbols))
+                      )))
+           )
+         (delete target-file
+                 (filter (filename-extension ".scm")
+                         (filter regular-file?
+                                 (find-all-files-under module-dir)))))))
+
+
+  (define file-uses (make-hash-table))
+  (define symbol-used-by (make-hash-table))
+
+  (for-each (lambda (edge)
+              (hashq-set! symbol-used-by (cdr edge)
+                          (cons (car edge) (hashq-ref symbol-used-by (cdr edge) '())))
+              (hash-set! file-uses (car edge)
+                         (cons (cdr edge) (hash-ref file-uses (car edge) '()))))
+            edges)
+
+  (hash-for-each (lambda (symb files)
+                   (display (center-string (format #f " ~a (~a uses)" symb (length files))
+                                           80 #\= #\=)) (newline)
+                   (for-each (lambda (file) (format #t "• ~a~%" file)) files))
+                 symbol-used-by)
+
+  (display (center-string "Unused" 80 #\= #\=)) (newline)
+  (for-each (lambda (symb) (format #t "• ~a~%" symb))
+            (lset-difference
+             eqv?
+             (module-map (lambda (k _) k) (resolve-interface target-module) )
+             (hash-map->list (lambda (k _) k) symbol-used-by)))
+
+  )
-- 
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