walk a directory tree for symlinking

1 files changed, 101 insertions, 0 deletions

diff --git a/walk.scm b/walk.scm
new file mode 100755
index 0000000..4e53dca
--- /dev/null
+++ b/walk.scm
@@ -0,0 +1,101 @@
+#!/usr/bin/guile \
+-s
+!#
+(use-modules (ice-9 popen)
+             (logging logger)
+             (logging port-log)
+             (ice-9 ftw)
+             (ice-9 match)
+             (oop goops)
+             (term ansi-color))
+
+(define (expand-file f)
+  ;; https://irreal.org/blog/?p=83
+  (cond ((absolute-file-name? f) f)
+        ((string=? (substring f 0 2) "~/")
+         (let ((prefix (passwd:dir (getpwuid (geteuid)))))
+           (string-append prefix (substring f 1 (string-length f)))))
+        ((char=? (string-ref f 0) #\~)
+         (let* ((user-end (string-index f #\/))
+                (user (substring f 1 user-end))
+                (prefix (passwd:dir (getpwnam user))))
+           (string-append prefix (substring f user-end (string-length f)))))
+        (else (string-append (getcwd) "/" f))))
+
+(define (symlink? path)
+  (false-if-exception
+   (eq? 'symlink (stat:type (lstat path)))))
+
+(define (clean-file full-dest)
+  (when (false-if-exception (lstat full-dest))
+    (display (string-append "\nDeleting previous file: " full-dest))
+    ;(delete-file full-dest)
+    ))
+
+(define (config-links src target)
+  (let ((src-path (expand-file src))
+        (target-path (expand-file target)))
+    (unless (and (symlink? target-path) (equal? (readlink target-path) src-path))
+      (clean-file target-path)
+      ;(symlink src-path target-path)
+      (display (string-append "\n  Symlink: " src " -> " target)))))
+
+(define (total-file-size file-name target-path)
+  "Return the size in bytes of the files under FILE-NAME (similar
+          to `du --apparent-size' with GNU Coreutils.)"
+  (define src-len (string-length file-name))
+
+  (define (enter? name stat result)
+    ;; Skip version control directories.
+    (let* ((subdir (substring name src-len))
+           (target-subdir (string-append target-path subdir)))
+      (format #t "~%~a: ~a | ~a ~a" name subdir target-subdir (stat:type stat))
+      (false-if-exception (eq? 'directory (stat:type (lstat target-subdir))))
+      ))
+
+  (define (leaf name stat result)
+    ;; Return RESULT plus the size of the file at NAME.
+    (let* ((subfile (substring name src-len))
+           (target-subfile (string-append target-path subfile)))
+      (config-links name target-subfile))
+
+    (set-car! result (1+ (car result)))
+    result)
+
+  ;; Count zero bytes for directories.
+  (define (down name stat result)
+    (format #t "~% down on ~a" name)
+    (cons 0 result))
+  (define (up name stat result)
+    (let* ((subdir (substring name src-len))
+           (target-subdir (string-append target-path subdir))
+           (target-subdir-file-count (length (scandir target-subdir
+                                                      (lambda (x)
+                                                        (not (member x (list "." ".."))))))))
+      (format #t "~% up on ~a ~a ~a ~a " result name target-subdir target-subdir-file-count)
+      (when (= (car result) target-subdir-file-count)
+        ;(format #t "~% Clear ~a because is identical to source" name)
+        (leaf name stat result)))
+
+    (list-set! result 1 (1+ (cadr result)))
+    (cdr result))
+  ;; Likewise for skipped directories.
+  (define skip leaf)
+
+  ;; Ignore unreadable files/directories but warn the user.
+  (define (error name stat errno result)
+    (format (current-error-port) "warning: ~a: ~a~%"
+            name (strerror errno))
+    result)
+
+  (file-system-fold enter? leaf down up skip error
+                    (list 0)
+                    file-name))
+
+
+(total-file-size "config" "/home/titan/.config")
+
+(let ((di "/home/titan/.config/you"))
+  (false-if-exception (eq? 'directory (stat:type (lstat di)))))
+
+(error "hci" #f)