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elpa/geiser-20171010.1610/scheme/racket/geiser/enter.rkt

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+;;; enter.rkt -- custom module loaders
+
+;; Copyright (C) 2010, 2012, 2013, 2014 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: Wed Mar 31, 2010 21:53
+
+#lang racket/base
+
+(require syntax/modcode
+         (for-syntax racket/base)
+         racket/path)
+
+(provide get-namespace visit-module module-loader)
+
+(struct mod (name load-path timestamp depends) #:transparent)
+
+(define (make-mod name path ts code)
+  (let ([deps (if code
+                  (apply append (map cdr (module-compiled-imports code)))
+                  null)])
+    (mod name (path->string path) ts deps)))
+
+(define loaded (make-hash))
+
+(define (mod->path mod)
+  (with-handlers ([exn? (lambda (_) #f)])
+    (let ([rp (module-path-index-resolve (module-path-index-join mod #f))])
+      (resolved-module-path-name rp))))
+
+(define (visit-module mod)
+  (dynamic-require mod #f)
+  (check-latest mod))
+
+(define (module-loader orig)
+  (make-loader orig #f))
+
+(define inhibit-eval (make-parameter #f))
+
+(define (get-namespace mod)
+  (let ([mod (cond [(symbol? mod) mod]
+                   [(string? mod) (find-module! (string->path mod) mod)]
+                   [(path? mod) (find-module! mod (path->string mod))]
+                   [else mod])])
+    (and mod
+         (with-handlers ([exn? (lambda (_) #f)])
+           (parameterize ([inhibit-eval #t])
+             (module->namespace mod))))))
+
+(define (find-module! path path-str)
+  (let ([m (or (hash-ref loaded path #f)
+               (let loop ([ps (remove path (resolve-paths path))]
+                          [seen '()])
+                 (cond [(null? ps) #f]
+                       [(hash-ref loaded (car ps) #f) =>
+                        (lambda (m)
+                          (add-paths! m (cdr ps))
+                          (add-paths! m (cons path seen))
+                          m)]
+                       [else (loop (cdr ps) (cons (car ps) seen))])))])
+    (list 'file (or (and m (mod-load-path m)) path-str))))
+
+(define (add-paths! m ps)
+  (for-each (lambda (p) (hash-set! loaded p m)) ps))
+
+(define (resolve-paths path)
+  (define (find root rest)
+    (let* ([alt-root (resolve-path root)]
+           [same? (equal? root alt-root)])
+      (cond [(null? rest) (cons root (if same? '() `(,alt-root)))]
+            [else (let* ([c (car rest)]
+                         [cs (cdr rest)]
+                         [rps (find (build-path root c) cs)])
+                    (if same?
+                        rps
+                        (append rps (find (build-path alt-root c) cs))))])))
+  (let ([cmps (explode-path path)])
+    (find (car cmps) (cdr cmps))))
+
+(define (notify re? path)
+  (when re? (fprintf (current-error-port) " [re-loading ~a]\n" path)))
+
+(define (module-name? name)
+  (and name (not (and (pair? name) (not (car name))))))
+
+(define (module-code re? name path)
+  (get-module-code path
+                   "compiled"
+                   (lambda (e)
+                     (parameterize ([compile-enforce-module-constants #f])
+                       (compile-syntax e)))
+                   (lambda (ext loader?) (load-extension ext) #f)
+                   #:notify (lambda (chosen) (notify re? chosen))))
+
+(define ((make-loader orig re?) path name)
+  (when (inhibit-eval)
+    (raise (make-exn:fail "namespace not found" (current-continuation-marks))))
+  (if (module-name? name)
+      ;; Module load:
+      (with-handlers ([(lambda (exn)
+                         (and (pair? name) (exn:get-module-code? exn)))
+                       ;; Load-handler protocol: quiet failure when a
+                       ;; submodule is not found
+                       (lambda (exn) (void))])
+        (let* ([code (module-code re? name path)]
+               [dir (or (current-load-relative-directory) (current-directory))]
+               [path (path->complete-path path dir)]
+               [path (normal-case-path (simplify-path path))])
+          (define-values (ts real-path) (get-timestamp path))
+          (add-paths! (make-mod name path ts code) (resolve-paths path))
+          (parameterize ([current-module-declare-source real-path])
+            (eval code))))
+      ;; Not a module:
+      (begin (notify re? path) (orig path name))))
+
+(define (get-timestamp path)
+  (let ([ts (file-or-directory-modify-seconds path #f (lambda () #f))])
+    (if ts
+        (values ts path)
+        (if (regexp-match? #rx#"[.]rkt$" (path->bytes path))
+            (let* ([alt-path (path-replace-suffix path #".ss")]
+                   [ts (file-or-directory-modify-seconds alt-path
+                                                         #f
+                                                         (lambda () #f))])
+              (if ts
+                  (values ts alt-path)
+                  (values -inf.0 path)))
+            (values -inf.0 path)))))
+
+(define (check-latest mod)
+  (define mpi (module-path-index-join mod #f))
+  (define done (make-hash))
+  (let loop ([mpi mpi])
+    (define rindex (module-path-index-resolve mpi))
+    (define rpath (resolved-module-path-name rindex))
+    (define path (if (pair? rpath) (car rpath) rpath))
+    (when (path? path)
+      (define npath (normal-case-path path))
+      (unless (hash-ref done npath #f)
+        (hash-set! done npath #t)
+        (define mod (hash-ref loaded rpath #f))
+        (when mod
+          (for-each loop (mod-depends mod))
+          (define-values (ts actual-path) (get-timestamp npath))
+          (when (> ts (mod-timestamp mod))
+            (define orig (current-load/use-compiled))
+            (parameterize ([current-load/use-compiled
+                            (make-loader orig #f)]
+                           [current-module-declare-name rindex]
+                           [current-module-declare-source actual-path])
+              ((make-loader orig #f) npath (mod-name mod)))))))))