add hg and python

1 files changed, 61 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Demo/scripts/mkrcs.py b/sys/src/cmd/python/Demo/scripts/mkrcs.py
new file mode 100755
index 000000000..cacdda0a5
--- /dev/null
+++ b/sys/src/cmd/python/Demo/scripts/mkrcs.py
@@ -0,0 +1,61 @@
+#! /usr/bin/env python
+
+# A rather specialized script to make sure that a symbolic link named
+# RCS exists pointing to a real RCS directory in a parallel tree
+# referenced as RCStree in an ancestor directory.
+# (I use this because I like my RCS files to reside on a physically
+# different machine).
+
+import os
+
+def main():
+    rcstree = 'RCStree'
+    rcs = 'RCS'
+    if os.path.islink(rcs):
+        print '%r is a symlink to %r' % (rcs, os.readlink(rcs))
+        return
+    if os.path.isdir(rcs):
+        print '%r is an ordinary directory' % (rcs,)
+        return
+    if os.path.exists(rcs):
+        print '%r is a file?!?!' % (rcs,)
+        return
+    #
+    p = os.getcwd()
+    up = ''
+    down = ''
+    # Invariants:
+    # (1) join(p, down) is the current directory
+    # (2) up is the same directory as p
+    # Ergo:
+    # (3) join(up, down) is the current directory
+    #print 'p =', repr(p)
+    while not os.path.isdir(os.path.join(p, rcstree)):
+        head, tail = os.path.split(p)
+        #print 'head = %r; tail = %r' % (head, tail)
+        if not tail:
+            print 'Sorry, no ancestor dir contains %r' % (rcstree,)
+            return
+        p = head
+        up = os.path.join(os.pardir, up)
+        down = os.path.join(tail, down)
+        #print 'p = %r; up = %r; down = %r' % (p, up, down)
+    there = os.path.join(up, rcstree)
+    there = os.path.join(there, down)
+    there = os.path.join(there, rcs)
+    if os.path.isdir(there):
+        print '%r already exists' % (there, )
+    else:
+        print 'making %r' % (there,)
+        makedirs(there)
+    print 'making symlink %r -> %r' % (rcs, there)
+    os.symlink(there, rcs)
+
+def makedirs(p):
+    if not os.path.isdir(p):
+        head, tail = os.path.split(p)
+        makedirs(head)
+        os.mkdir(p, 0777)
+
+if __name__ == "__main__":
+    main()