Add support for center alignment. Fix #57

We now have support for center alignment, simply add a header border
with the `g:table_mode_align_char` as both the first and the last
character so it would look something like `+:.....:+` to center align
the column values.

autoload/tablemode/align.vim

@@ -13,7 +13,7 @@ function! s:Padding(string, length, where) "{{{3
   elseif a:where =~# 'r'
     return repeat(" ", gap_length) . a:string
   elseif a:where =~# 'c'
-    let right = spaces / 2
+    let right = gap_length / 2
     let left = right + (right * 2 != gap_length)
     return repeat(" ", left) . a:string . repeat(" ", right)
   endif
@@ -64,14 +64,19 @@ function! tablemode#align#Split(string, delim)
 endfunction
 
 function! tablemode#align#alignments(lnum, ncols) "{{{2
+  let achr = g:table_mode_align_char
   let alignments = []
   if tablemode#table#IsBorder(a:lnum+1)
     let hcols = tablemode#align#Split(getline(a:lnum+1), '[' . g:table_mode_corner . g:table_mode_corner_corner . ']')
     for idx in range(len(hcols))
       " Right align if header
       call add(alignments, 'l')
-      if hcols[idx] =~# g:table_mode_align_char . '$' | let alignments[idx] = 'r' | endif
-      if hcols[idx] !~# '[^0-9\.]' | let alignments[idx] = 'r' | endif
+      if hcols[idx] =~# achr . '[^'.achr.']\+' . achr
+        let alignments[idx] = 'c'
+      elseif hcols[idx] =~# achr . '$'
+        let alignments[idx] = 'r'
+      endif
+      " if hcols[idx] !~# '[^0-9\.]' | let alignments[idx] = 'r' | endif
     endfor
   end
   return alignments

autoload/tablemode/table.vim

@@ -45,7 +45,10 @@ function! s:GenerateHeaderBorder(line) "{{{2
 
       for idx in range(len(hcols))
         if hcols[idx] =~# g:table_mode_align_char
-          if hcols[idx] =~# g:table_mode_align_char . '$'
+          " center align
+          if hcols[idx] =~# g:table_mode_align_char . '[^'.g:table_mode_align_char.']\+' . g:table_mode_align_char
+            let gcols[idx] = g:table_mode_align_char . gcols[idx][1:-2] . g:table_mode_align_char
+          elseif hcols[idx] =~# g:table_mode_align_char . '$'
             let gcols[idx] = gcols[idx][:-2] . g:table_mode_align_char
           else
             let gcols[idx] = g:table_mode_align_char . gcols[idx][1:]

t/fixtures/table/sample_header_realign_after.txt

@@ -1,4 +1,4 @@
-| Title | Message |
-|------:+--------:|
-|    t1 |    msg1 |
-|    t2 |    msg2 |
+| S. No | Title | Message |
+|-------+:------+:-------:|
+| 1     | t1    |   msg1  |
+| 2     | t2    |   msg2  |

t/fixtures/table/sample_header_realign_before.txt

@@ -1,4 +1,4 @@
-| Title | Message |
-|------:+--------:|
-| t1    | msg1    |
-| t2    | msg2    |
+|S. No|Title|Message|
+|-----+:----+:-----:|
+|1|t1|msg1|
+|2|t2|msg2|

t/fixtures/table/sample_header_realign_unicode_after.txt

@@ -1,6 +1,6 @@
 |--------------+------------------+------------|
 | 测试测试     |     测试长度     |     长测试 |
-|--------------+------------------+-----------:|
+|--------------+:----------------:+-----------:|
 | abc          |     测试长度     |     长测试 |
 | 长           | 测试测试测试测试 |   测试测试 |
 | 测试测试     |       测试       | 测试测测试 |

t/fixtures/table/sample_header_realign_unicode_before.txt

@@ -1,6 +1,6 @@
 |--------+--------+------|
 |测试测试|测试长度|长测试|
-|--------+--------+-----:|
+|--------+:------:+-----:|
 |abc|测试长度|长测试|
 |长|测试测试测试测试|测试测试|
 |测试测试|测试|测试测测试|