feat: Add (optin) support for formatting tables without borders (#643)

README.md

@@ -349,6 +349,27 @@ The following options control which syntax extensions will be turned on. They ar
 
  let g:vim_markdown_edit_url_in = 'tab'
 
+### Borderless tables
+
+- `g:vim_markdown_borderless_table`
+
+ Add support for borderless tables, such as:
+ ```
+ header 1|header 2
+ --|--
+ data 1|data 2
+ ```
+ if set to `1`:
+
+ let g:vim_markdown_borderless_table = 1
+
+ the table would be formatted as usual:
+ ```
+ | header 1 | header 2 |
+ |----------|----------|
+ | data 1 | data 2 |
+ ```
+
 ## Mappings
 
 The following work on normal and visual modes:

doc/vim-markdown.txt

@@ -490,6 +490,30 @@ Change how to open new files ~
 >
  let g:vim_markdown_edit_url_in = 'tab'
 <
+-------------------------------------------------------------------------------
+ *vim-markdown-support-borderless-tables*
+Support borderless tables ~
+
+ *g:vim_markdown_borderless_table*
+- 'g:vim_markdown_borderless_table'
+
+ Add support for borderless tables, such as:
+>
+ header 1|header 2
+ --|--
+ data 1|data 2
+<
+ if set to 1:
+>
+ let g:vim_markdown_borderless_table = 1
+<
+ the table would be formatted as usual:
+>
+ | header 1 | header 2 |
+ |----------|----------|
+ | data 1 | data 2 |
+<
+
 ===============================================================================
  *vim-markdown-mappings*
 Mappings ~

ftplugin/markdown.vim

@@ -538,6 +538,19 @@ endfunction
 "
 function! s:TableFormat()
  let l:pos = getpos('.')
+
+ if get(g:, 'vim_markdown_borderless_table', 0)
+ " add `|` to the beginning of the line if it isn't present
+ normal! {
+ call search('|')
+ execute 'silent .,''}s/\v^(\s{0,})\|?([^\|])/\1|\2/e'
+
+ " add `|` to the end of the line if it isn't present
+ normal! {
+ call search('|')
+ execute 'silent .,''}s/\v([^\|])\|?(\s{0,})$/\1|\2/e'
+ endif
+
  normal! {
  " Search instead of `normal! j` because of the table at beginning of file edge case.
  call search('|')
@@ -765,7 +778,7 @@ endif
 command! -buffer -range=% HeaderDecrease call s:HeaderDecrease(<line1>, <line2>)
 command! -buffer -range=% HeaderIncrease call s:HeaderDecrease(<line1>, <line2>, 1)
 command! -buffer -range=% SetexToAtx call s:SetexToAtx(<line1>, <line2>)
-command! -buffer TableFormat call s:TableFormat()
+command! -buffer -range TableFormat call s:TableFormat()
 command! -buffer Toc call s:Toc()
 command! -buffer Toch call s:Toc('horizontal')
 command! -buffer Tocv call s:Toc('vertical')

test/table-format.vader

@@ -68,3 +68,18 @@ Expect (preserve colons to align text):
  | left | right | center | |
  |:-----|------:|:------:|:--|
  | left | right | center | |
+
+Given markdown (borderless table);
+ left |right| center 
+ :- | --: |:---:
+ left |right| center 
+
+Execute (format borderless table):
+ let g:vim_markdown_borderless_table = 1
+ TableFormat
+ unlet g:vim_markdown_borderless_table
+
+Expect (table with borders):
+ | left | right | center |
+ |:-----|------:|:------:|
+ | left | right | center |