Completion dumpfile

[Peter Stephenson <pws@ibmth.df.unipi.it>]

This will need checking on a wider range of installations than I can do.
This will fail if for some reason users are sharing a function directory
which is world-writeable (which is frightening), but you can work that out
from the documentation.

Note I've also made compinit not override any existing values of the
compconfig keys correct_accept, correct_prompt, completer.

--- Completion/Core/compinit.df	Mon Jun  7 10:54:15 1999
+++ Completion/Core/compinit	Mon Jun  7 16:35:40 1999
@@ -91,13 +91,31 @@
   # We were told what directory to use.
   compconfig[dumpfile]="$_i_fdir/compinit.dump"
 else
-  # Now we're stuck, but we'd better do something.
-  compconfig[dumpfile]="$HOME/.compinit.dump"
+  compconfig[dumpfile]=''
 fi
 
-compconfig[correct_accept]=2n
-compconfig[correct_prompt]='correct to:'
-compconfig[completer]=_complete
+if [[ -n $compconfig[dumpfile] ]]; then
+  # Check the file is writeable.  If it doesn't exist, the
+  # only safe way is to try and create it.
+  if [[ -f $compconfig[dumpfile] ]]; then
+    [[ -w $compconfig[dumpfile] ]] || compconfig[dumpfile]=''
+  elif touch $compconfig[dumpfile] >& /dev/null; then
+    rm -f $compconfig[dumpfile]
+  else
+    compconfig[dumpfile]=''
+  fi
+fi
+
+if [[ -z $compconfig[dumpfile] ]]; then
+  # If no dumpfile given, or it was not writeable, then use
+  # user's ZDOTDIR.
+  compconfig[dumpfile]="${ZDOTDIR:-$HOME}/.zcompdump"
+fi
+
+(( ${+compconfig[correct_accept]} )) || compconfig[correct_accept]=2n
+(( ${+compconfig[correct_prompt]} )) ||
+  compconfig[correct_prompt]='correct to:'
+(( ${+compconfig[completer]} )) || compconfig[completer]=_complete
 
 # This function is used to register or delete completion functions. For
 # registering completion functions, it is invoked with the name of the
--- Doc/Zsh/compsys.yo.df	Mon Jun  7 13:55:55 1999
+++ Doc/Zsh/compsys.yo	Mon Jun  7 16:22:07 1999
@@ -89,9 +89,11 @@
 configuration which will be read in on future invocations.  The easiest way
 to do this is by adding the option tt(-d) whenever tt(compinit) is sourced.
 In this case the dumped file will have the same name as the sourced file,
-but with tt(.dump) appended to the end; alternatively, an explicit file
-name can be given following the tt(-d).  On the next call to tt(compinit
--d), the dumped file will be read instead.
+but with tt(.dump) appended to the end, or, if that is not writeable by the
+user, the file tt(.zcompdump) in the same directory as the startup files
+(i.e. tt($ZDOTDIR) or tt($HOME)); alternatively, an explicit file name can
+be given following the tt(-d).  On the next call to tt(compinit -d), the
+dumped file will be read instead.
 
 The other option accepted by tt(compinit) is tt(-f var(dir)), which gives
 the directory in which tt(compinit) resides.  If you source tt(compinit) by

-- 
Peter Stephenson <pws@ibmth.df.unipi.it>       Tel: +39 050 844536
WWW:  http://www.ifh.de/~pws/
Dipartimento di Fisica, Via Buonarroti 2, 56127 Pisa, Italy