Fix `indentation` option to work with hard tabs (#19)

autoload/easy_align.vim

@@ -422,11 +422,11 @@ function! s:do_align(todo, modes, all_tokens, all_delims, fl, ll, fc, lc, nth, r
   if a:nth == 1
     let idt = d.indentation
     if idt ==? 'd'
-      let indent = repeat(' ', max.indent)
+      let indent = max.indent
     elseif idt ==? 's'
-      let indent = repeat(' ', min_indent)
+      let indent = min_indent
     elseif idt ==? 'n'
-      let indent = ''
+      let indent = 0
     elseif idt !=? 'k'
       call s:exit('Invalid indentation: ' . idt)
     end
@@ -439,9 +439,22 @@ function! s:do_align(todo, modes, all_tokens, all_delims, fl, ll, fc, lc, nth, r
       for [line, elems] in items(lines)
         let [nth, prefix, token, delim] = elems
 
-        let token = substitute(token, '^\s*', indent, '')
+        let tindent = matchstr(token, '^\s*')
+        while 1
+          let len = s:strwidth(tindent)
+          if len < indent
+            let tindent .= repeat(' ', indent - len)
+            break
+          elseif len > indent
+            let tindent = tindent[0 : -2]
+          else
+            break
+          endif
+        endwhile
+
+        let token = tindent . s:ltrim(token)
         if mode ==? 'c'
-          let token = substitute(token, '\s*$', indent, '')
+          let token = substitute(token, '\s*$', repeat(' ', indent), '')
         endif
         let [pw, tw] = [s:strwidth(prefix), s:strwidth(token)]
         let max.token_len = max([max.token_len, tw])

test/interactive.vader

@@ -1465,6 +1465,24 @@ Expect:
   			 ccccc = 4=5
   				fff  = 4=6
 
+Do (Left alignment with shallow indentation):
+  vip\<Enter>\<C-I>=
+
+Expect:
+  		a     = 1=3
+  		bbb   = 2=4
+  		ccccc = 4=5
+  		fff   = 4=6
+
+Do (Center alignment with deep indentation):
+  vip\<Enter>\<Enter>\<Enter>\<C-I>\<C-I>=
+
+Expect:
+  		      a   = 1=3
+  			   bbb  = 2=4
+  			  ccccc = 4=5
+  				 fff  = 4=6
+
 Given (hard-tab indentation - dictionary (#19)):
   		ddict={'homePage':'360452',
   		'key':'TEST',