commit f9192b43985e31d0b4c3f82029f0a628e3d8094b
Author: Quentin Dufour <quentin@deuxfleurs.fr>
Date:   Fri Jul 22 17:11:39 2022 +0200

    Initial commit

diff --git a/README.md b/README.md
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+# Interactive Programming
+
+Le but de ce dépôt est de prendre l'habitude de pratiquer "l'interactive programming"
+avec Scheme.
+
+Le fichier shell.nix contient :
+  - Chez Scheme
+  - Emacs
+  - Geiser
+
+Pour commencer rapidement :
+
+```
+emacs -nw album.ss
+```
+
+Ensuite quelques raccourcis pratiques :
+
+```
+C-x C-s - Sauvegarder
+C-x k - Fermer le buffer
+C-c C-c - Evaluer la définition sous le curseur
+C-c C-z - Ouvrir le REPL
+```
diff --git a/album.ss b/album.ss
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+(define (flatten l)
+  (cond
+   ((not (list? l)) l)
+   ((null? l) '())
+   ((list? (car l)) (append (flatten (car l)) (flatten (cdr l))))
+   (#t (cons (car l) (flatten (cdr l))))))
+
+
+(define (tree path)
+  (cond
+   ((file-directory? path)
+    (map (lambda (item) (tree (string-append path "/" item))) (directory-list path)))
+   (#t path)))
+
+(define (string-suffix s n)
+  (let ([strlen (string-length s)])
+    (substring s (- strlen n) strlen)))
+
+(define (pictures path)
+  (sort
+   string<=?
+   (filter
+    (lambda (filename) (string=? ".JPG" (string-suffix filename 4)))
+    (flatten (tree path)))))
+
+
+(define (albumize path)
+  `(html ()
+    (head ()
+     (meta (charset "utf-8"))
+     (style () "
+img {
+	display:block;
+	max-width: 100%;
+	margin: auto;
+	padding: 10px;
+}
+     "))
+    (body ()
+	  ,(map (lambda (filename) `(img (src ,filename))) (pictures path)))))
+
+;(define (sexpr->html
+     
+     
diff --git a/shell.nix b/shell.nix
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+++ b/shell.nix
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+{ pkgs ? import <nixpkgs> {} }: 
+
+pkgs.mkShell {
+  nativeBuildInputs = [
+    ((pkgs.emacsPackagesFor pkgs.emacs).emacsWithPackages
+      (epkgs: [ pkgs.emacs28Packages.geiser-chez ]))
+    pkgs.chez
+  ];
+}