Enable passing stdin to xolox#shell#execute()

This enables integration with my luainspect.vim plug-in.

TODO.md

@@ -1,5 +1,7 @@
  * Test the `shell.dll` library on as many configurations as possible! (different Windows versions, 32 vs. 64 bit, etc.)
 
+ * Document how to pass standard input to shell commands using xolox#shell#execute().
+
  * Replace the temporary file hack with a proper silent `popen()` implementation?
 
  * I've [announced this plug-in](http://groups.google.com/group/vim_dev/browse_frm/thread/2cdeb5709fbfc0a0) on the vim-dev mailing list but received some criticism. So for future reference: The problem solved by `xolox#shell#execute()` really does exist, see for example the [Syntastic script page](http://www.vim.org/scripts/script.php?script_id=2736) which says: "This plugin is currently only recommended for UNIX users. It is functional on Windows, but since the syntax checking plugins shell out, the command window briefly appears whenever one is executed."

autoload.vim

@@ -1,6 +1,6 @@
 " Vim auto-load script
 " Author: Peter Odding <peter@peterodding.com>
-" Last Change: August 9, 2010
+" Last Change: August 10, 2010
 " URL: http://peterodding.com/code/vim/shell/
 
 if !exists('s:script')
@@ -142,12 +142,18 @@ function! xolox#shell#highlight_urls() " -- highlight URLs and e-mail addresses
   endif
 endfunction
 
-function! xolox#shell#execute(command, synchronous) " -- execute external commands asynchronously {{{1
+function! xolox#shell#execute(command, synchronous, ...) " -- execute external commands asynchronously {{{1
   try
     let cmd = a:command
+    let has_input = a:0 > 0
+    if has_input
+      let tempin = tempname()
+      call writefile(type(a:1) == type([]) ? a:1 : split(a:1, "\n"), tempin)
+      let cmd .= ' < ' . shellescape(tempin)
+    endif
     if a:synchronous
-      let tempfile = tempname()
-      let cmd .= ' > ' . shellescape(tempfile) . ' 2>&1'
+      let tempout = tempname()
+      let cmd .= ' > ' . shellescape(tempout) . ' 2>&1'
     endif
     if s:is_windows() && s:has_dll()
       let fn = 'execute_' . (a:synchronous ? '' : 'a') . 'synchronous'
@@ -165,18 +171,19 @@ function! xolox#shell#execute(command, synchronous) " -- execute external comman
       call s:handle_error(cmd, output)
     endif
     if a:synchronous
-      if !filereadable(tempfile)
+      if !filereadable(tempout)
         let msg = '%s: Failed to execute %s!'
         throw printf(msg, s:script, strtrans(cmd))
       endif
-      let output = readfile(tempfile)
-      call delete(tempfile)
-      return output
+      return readfile(tempout)
     else
       return 1
     endif
   catch
     call xolox#warning("%s: %s at %s", s:script, v:exception, v:throwpoint)
+  finally
+    if exists('tempin') | call delete(tempin) | endif
+    if exists('tempout') | call delete(tempout) | endif
   endtry
 endfunction
 

shell.vim

@@ -1,9 +1,9 @@
 " Vim plug-in
 " Author: Peter Odding <peter@peterodding.com>
-" Last Change: August 9, 2010
+" Last Change: August 10, 2010
 " URL: http://peterodding.com/code/vim/shell/
 " License: MIT
-" Version: 0.7
+" Version: 0.7.1
 
 " Support for automatic update using the GLVS plug-in.
 " GetLatestVimScripts: 3123 1 :AutoInstall: shell.zip