Simplify filename matching in redact_pass.vim

Use the autocmd pattern to match the password filename rather than doing
it manually within the called function.

2 files changed, 11 insertions, 40 deletions

diff --git a/contrib/vim/redact_pass.txt b/contrib/vim/redact_pass.txt
index 86d8a25..62c9d15 100644
--- a/contrib/vim/redact_pass.txt
+++ b/contrib/vim/redact_pass.txt
@@ -1,4 +1,4 @@
-*redact_pass.txt*	For Vim version 6.0	Last change: 2018 June 10
+*redact_pass.txt*	For Vim version 6.0	Last change: 2018 June 24
 
 DESCRIPTION					*redact_pass*
 
@@ -8,8 +8,8 @@ and 'undofile' options globally when editing a password in `pass(1)`.
 This is to prevent anyone being able to extract passwords from your Vim cache
 files in the event of a compromise.
 
-You should test this after installed to ensure you see this message is printed
-whenever you `pass edit`:
+You should test this after installation to ensure you see this message is
+printed whenever you `pass edit`:
 
 > Editing password file--disabled leaky options!
 
diff --git a/contrib/vim/redact_pass.vim b/contrib/vim/redact_pass.vim
index 14919bb..a3d67e8 100644
--- a/contrib/vim/redact_pass.vim
+++ b/contrib/vim/redact_pass.vim
@@ -11,49 +11,16 @@
 if exists('g:loaded_redact_pass') || &compatible
   finish
 endif
-if !has('autocmd')
+if !has('autocmd') || v:version < 600
   finish
 endif
 let g:loaded_redact_pass = 1
 
-" Pattern to match for the portion of the path after the temporary dir,
-" starting with the leading slash
-let s:pattern = '\m\C/pass\.[^/]\+/[^/]\+\.txt$'
-
-" Check whether the given dir name is not an empty string, whether the first
-" file in the argument list is within the named dir, and that the whole path
-" matches the above pattern immediately after that dir name
-function! s:PassPath(root)
-
-  " Check we actually got a value, i.e. this wasn't an empty environment
-  " variable
-  if !strlen(a:root)
-    return 0
-  endif
-
-  " Full resolved path to the root dir with no trailing slashes
-  let l:root = fnamemodify(a:root, ':p:h')
-
-  " Full resolved path to the first file in the arg list
-  let l:path = fnamemodify(argv(0), ':p')
-
-  " Check the string all match and at the expected points
-  return stridx(l:path, l:root) == 0
-        \ && strlen(l:root) == match(l:path, s:pattern)
-
-endfunction
-
 " Check whether we should set redacting options or not
 function! s:CheckArgsRedact()
 
-  " Short-circuit unless we're editing just one file and it looks like a path
-  " in one of the three expected directories; we're trying hard to make sure
-  " this really is a password file and we're not messing with the user's
-  " precious settings unnecessarily
-  if argc() != 1
-        \ || !s:PassPath('/dev/shm')
-        \ && !s:PassPath($TMPDIR)
-        \ && !s:PassPath('/tmp')
+  " Ensure there's one argument and it's the matched file
+  if argc() != 1 || fnamemodify(argv(0), ':p') !=# expand('<afile>:p')
     return
   endif
 
@@ -76,5 +43,9 @@ endfunction
 " Auto function loads only when Vim starts up
 augroup redact_pass
   autocmd!
-  autocmd VimEnter * call s:CheckArgsRedact()
+  autocmd VimEnter
+        \ /dev/shm/pass.?*/?*.txt
+        \,$TMPDIR/pass.?*/?*.txt
+        \,/tmp/pass.?*/?*.txt
+        \ call s:CheckArgsRedact()
 augroup END