ENH Add symlink_[absolute|relative].py for symlink handling

README.rst

@@ -19,6 +19,8 @@ EMBL utilities
 
 ``mv_keep_parents`` - equivalent to ``cp --parents src/*.txt dest/`` but moving instead of copying. Passing ``-k`` will keep empty directories in ``src/``.
 
+``symlink_relative.py`` and ``symlink_absolute.py`` - convert symlinks to relative/absolute respectively. 
+
 Examples
 ========
 

bin/symlink_absolute.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+
+
+def handle_files(files):
+    for file in files:
+        if os.path.islink(file):
+            real = os.path.realpath(file)
+            old = file + ".old"
+
+            os.rename(file, old)
+            os.symlink(real, file)
+            os.remove(old)
+
+            print(file, "is now absolute pointing at", real)
+        else:
+            print(file, "is not a symlink or is broken")
+
+
+def usage():
+    print("This script is useful to transform relative symlinks into absolute.")
+    print("As a side-effect if the symlink points to chain of symlinks these "
+          "will be resolved such that the new symlink points directly to the "
+          "original file")
+    print("\nSee also: symlink_relative.py\n")
+    print("\nUsage:")
+    print("  ", sys.argv[0], "<symlink1> [<symlink2> ...]\n")
+
+
+def main():
+    files = sys.argv[1:]
+    if not files:
+        usage()
+        sys.exit(1)
+
+    handle_files(files)
+
+
+if __name__ == "__main__":
+    main()
+
+# vim: ai sts=4 et sw=4

bin/symlink_relative.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+
+
+def handle_files(files):
+    for file in files:
+        if os.path.islink(file):
+            real = os.path.realpath(file)
+            dest = os.path.realpath(os.path.dirname(file))
+            relative = os.path.relpath(real, dest)
+            old = file + ".old"
+
+            os.rename(file, old)
+            os.symlink(relative, file)
+            os.remove(old)
+
+            print(file, "is now relative pointing at", relative)
+        else:
+            print(file, "is not a symlink or is broken")
+
+
+def usage():
+    print("This script is useful to transform absolute symlinks into relative "
+          "with regards to the location the symlink is stored in.")
+    print("As a side-effect if the symlink points to chain of symlinks these "
+          "will be resolved such that the new symlink points directly to the "
+          "original file")
+    print("\nSee also: symlink_absolute.py\n")
+    print("\nUsage:")
+    print("  ", sys.argv[0], "<symlink1> [<symlink2> ...]\n")
+
+
+def main():
+    files = sys.argv[1:]
+    if not files:
+        usage()
+        sys.exit(1)
+
+    handle_files(files)
+
+
+if __name__ == "__main__":
+    main()
+
+# vim: ai sts=4 et sw=4