[align] Regex support and default patterns

align/plugin/align.vim

@@ -1,20 +1,41 @@
-function! s:Align(sequence) range
+if !exists('g:Align_DefaultSeq')
+  let g:Align_DefaultSeq = {}
+endif
+
+let g:Align_DefaultSeq['c']      = '='
+let g:Align_DefaultSeq['cpp']    = '='
+let g:Align_DefaultSeq['python'] = '='
+let g:Align_DefaultSeq['vhdl']   = '<=\|:\|:=\|=>'
+let g:Align_DefaultSeq['vim']    = '='
+
+function! s:Align(...) range
+  " If sequence is not set, find the default pattern for the current filetype
+  if !exists("a:1")
+    if !exists("g:Align_DefaultSeq[&filetype]")
+      echoerr "No Pattern was given and no default pattern could be found. Doing nothing."
+      return
+    endif
+
+    let l:sequence = g:Align_DefaultSeq[&filetype]
+  else
+    let l:sequence = a:1
+  endif
+
   " First, find the rightmost occurence of sequence in all lines
   let l:index = 0
   for i in range(a:firstline, a:lastline)
     let l:line = getline(i)
-    let l:seqpos = stridx(l:line, a:sequence)
+    let l:seqpos = match(l:line, l:sequence)
     if l:seqpos > l:index
       let l:index = l:seqpos
     endif
   endfor
-  echo "Rightmost position: " . l:index
 
   " Now, for each line, find the first occurrence of sequence, and insert
   " spaces until sequence was shifted to l:index
   for i in range(a:firstline, a:lastline)
     let l:line = getline(i)
-    let l:seqpos = stridx(l:line, a:sequence)
+    let l:seqpos = match(l:line, l:sequence)
 
     if l:seqpos == -1
       continue
@@ -37,4 +58,4 @@ function! s:Align(sequence) range
   endfor
 endfunction
 
-command! -nargs=1 -range Align <line1>,<line2>call s:Align(<args>)
+command! -nargs=? -range Align <line1>,<line2>call s:Align(<args>)