Update add_aliases to optionally create copies.

Once again we need to create aliases, slightly differently.  In this
case we want to generate new copies of files, not symlinks, and
generate the copies in a new location.  So add these options.

add_aliases.py

@@ -18,6 +18,7 @@ import argparse
 import glob
 import os
 from os import path
+import shutil
 import sys
 
 """Create aliases in target directory.
@@ -28,7 +29,11 @@ codepoint in their names."""
 DATA_ROOT = path.dirname(path.abspath(__file__))
 
 def str_to_seq(seq_str):
-  return tuple([int(s, 16) for s in seq_str.split('_')])
+  res = [int(s, 16) for s in seq_str.split('_')]
+  if 0xfe0f in res:
+    print '0xfe0f in file name: %s' % seq_str
+    res = [x for x in res if x != 0xfe0f]
+  return tuple(res)
 
 
 def seq_to_str(seq):
@@ -67,42 +72,61 @@ def read_emoji_aliases(filename):
   return result
 
 
-def add_aliases(filedir, prefix, ext, replace=False, dry_run=False):
-  if not path.isdir(filedir):
-    print >> sys.stderr, '%s is not a directory' % filedir
+def add_aliases(
+    srcdir, dstdir, aliasfile, prefix, ext, replace=False, copy=False,
+    dry_run=False):
+  """Use aliasfile to create aliases of files in srcdir matching prefix/ext in
+  dstdir.  If dstdir is null, use srcdir as dstdir.  If replace is false
+  and a file already exists in dstdir, report and do nothing.  If copy is false
+  create a symlink, else create a copy.  If dry_run is true, report what would
+  be done.  Dstdir will be created if necessary, even if dry_run is true."""
+
+  if not path.isdir(srcdir):
+    print >> sys.stderr, '%s is not a directory' % srcdir
     return
 
+  if not dstdir:
+    dstdir = srcdir
+  elif not path.isdir(dstdir):
+    os.makedirs(dstdir)
+
   prefix_len = len(prefix)
   suffix_len = len(ext) + 1
   filenames = [path.basename(f)
-               for f in glob.glob(path.join(filedir, '%s*.%s' % (prefix, ext)))]
+               for f in glob.glob(path.join(srcdir, '%s*.%s' % (prefix, ext)))]
   seq_to_file = {
       str_to_seq(name[prefix_len:-suffix_len]) : name
       for name in filenames}
 
-  aliases = read_emoji_aliases()
+  aliases = read_emoji_aliases(aliasfile)
   aliases_to_create = {}
   aliases_to_replace = []
-  for als,trg in sorted(aliases.items()):
+  alias_exists = False
+  for als, trg in sorted(aliases.items()):
     if trg not in seq_to_file:
       print >> sys.stderr, 'target %s for %s does not exist' % (
           seq_to_str(trg), seq_to_str(als))
       continue
-    if als in seq_to_file:
+    alias_name = '%s%s.%s' % (prefix, seq_to_str(als), ext)
+    alias_path = path.join(dstdir, alias_name)
+    if path.exists(alias_path):
       if replace:
-        aliases_to_replace.append(seq_to_file[als])
+        aliases_to_replace.append(alias_name)
       else:
         print >> sys.stderr, 'alias %s exists' % seq_to_str(als)
+        alias_exists = True
         continue
     target_file = seq_to_file[trg]
-    alias_name = '%s%s.%s' % (prefix, seq_to_str(als), ext)
     aliases_to_create[alias_name] = target_file
 
   if replace:
     if not dry_run:
       for k in sorted(aliases_to_replace):
-        os.remove(path.join(filedir, k))
+        os.remove(path.join(dstdir, k))
     print 'replacing %d files' % len(aliases_to_replace)
+  elif alias_exists:
+    print >> sys.stderr, 'aborting, aliases exist.'
+    return
 
   for k, v in sorted(aliases_to_create.items()):
     if dry_run:
@@ -110,18 +134,32 @@ def add_aliases(filedir, prefix, ext, replace=False, dry_run=False):
       print '%s%s -> %s' % (msg, k, v)
     else:
       try:
-        os.symlink(v, path.join(filedir, k))
-      except:
+        if copy:
+          shutil.copy2(path.join(srcdir, v), path.join(dstdir, k))
+        else:
+          # fix this to create relative symlinks
+          if srcdir == dstdir:
+            os.symlink(v, path.join(dstdir, k))
+          else:
+            raise Exception('can\'t create cross-directory symlinks yet')
+      except Exception as e:
         print >> sys.stderr, 'failed to create %s -> %s' % (k, v)
-        raise Exception('oops')
-  print 'created %d symlinks' % len(aliases_to_create)
+        raise Exception('oops, ' + str(e))
+  print 'created %d %s' % (
+      len(aliases_to_create), 'copies' if copy else 'symlinks')
 
 
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument(
-      '-d', '--filedir', help='directory containing files to alias',
+      '-s', '--srcdir', help='directory containing files to alias',
       required=True, metavar='dir')
+  parser.add_argument(
+      '-d', '--dstdir', help='directory to write aliases, default srcdir',
+      metavar='dir')
+  parser.add_argument(
+      '-a', '--aliasfile', help='alias file (default emoji_aliases.txt)',
+      metavar='file', default='emoji_aliases.txt')
   parser.add_argument(
       '-p', '--prefix', help='file name prefix (default emoji_u)',
       metavar='pfx', default='emoji_u')
@@ -131,12 +169,17 @@ def main():
   parser.add_argument(
       '-r', '--replace', help='replace existing files/aliases',
       action='store_true')
+  parser.add_argument(
+      '-c', '--copy', help='create a copy of the file, not a symlink',
+      action='store_true')
   parser.add_argument(
       '-n', '--dry_run', help='print out aliases to create only',
       action='store_true')
   args = parser.parse_args()
 
-  add_aliases(args.filedir, args.prefix, args.ext, args.replace, args.dry_run)
+  add_aliases(
+      args.srcdir, args.dstdir, args.aliasfile, args.prefix, args.ext,
+      args.replace, args.copy, args.dry_run)
 
 
 if __name__ == '__main__':