Merge pull request #465 from brandon1024/renderer-support-textprops

feat: add support for rendering text with props

autoload/fern.vim

@@ -36,6 +36,7 @@ call s:Config.config(expand('<sfile>:p'), {
       \ 'default_exclude': '',
       \ 'renderer': 'default',
       \ 'renderers': {},
+      \ 'enable_textprop_support': 0,
       \ 'comparator': 'default',
       \ 'comparators': {},
       \ 'drawer_width': 30,

autoload/fern/internal/buffer.vim

@@ -5,14 +5,40 @@ function! fern#internal#buffer#replace(bufnr, content) abort
   let modifiable_saved = getbufvar(a:bufnr, '&modifiable')
   try
     call setbufvar(a:bufnr, '&modifiable', 1)
-    call setbufline(a:bufnr, 1, a:content)
-    call deletebufline(a:bufnr, len(a:content) + 1, '$')
+
+    if g:fern#enable_textprop_support
+      call s:replace_buffer_content(a:bufnr, a:content)
+    else
+      call setbufline(a:bufnr, 1, a:content)
+      call deletebufline(a:bufnr, len(a:content) + 1, '$')
+    endif
   finally
     call setbufvar(a:bufnr, '&modifiable', modifiable_saved)
     call setbufvar(a:bufnr, '&modified', modified_saved)
   endtry
 endfunction
 
+" Replace buffer content with lines of text with (optional) text properties.
+function! s:replace_buffer_content(bufnr, content) abort
+  for lnum in range(len(a:content))
+    let line = a:content[lnum]
+    let [text, props] = type(line) is# v:t_dict
+      \ ? [line.text, get(line, 'props', [])]
+      \ : [line, []]
+
+    call setbufline(a:bufnr, lnum + 1, text)
+
+    if exists('*prop_add')
+      for prop in props
+        let prop.bufnr = a:bufnr
+        call prop_add(lnum + 1, prop.col, prop)
+      endfor
+    endif
+  endfor
+
+  call deletebufline(a:bufnr, len(a:content) + 1, '$')
+endfunction
+
 function! fern#internal#buffer#open(bufname, ...) abort
   let options = extend({
         \ 'opener': 'edit',

autoload/fern/internal/drawer/hover_popup.vim

@@ -74,7 +74,7 @@ function! s:show() abort
     call setbufline('%', 1, line)
     call helper.fern.renderer.syntax()
     call helper.fern.renderer.highlight()
-    syntax clear FernRoot
+    syntax clear FernRootSymbol
     syntax clear FernRootText
 
     setlocal nowrap cursorline noswapfile nobuflisted buftype=nofile bufhidden=hide

doc/fern-develop.txt

@@ -558,7 +558,15 @@ nodes as a tree.
 
 					*fern-develop-renderer.render()*
 .render({nodes})
-	Return a promise which is resolved to a list of |String|.
+	Return a promise which is resolved to:
+
+	  a list of |String|, or
+	  if |g:fern#enable_textprop_support| is 1, a list of |Dictionary|
+		with the following entries:
+	    text  |String| with the text to display.
+	    props A list of text properties (|Dictionary|). Optional. Not supported
+	          for Neovim. Each entry is a dictionary, like the third argument
+	          of |prop_add()|, but specifying a column with a "col" entry.
 
 	Change (v1.6.0):~
 	Second argument ({marks}) has removed.

doc/fern.txt

@@ -523,6 +523,11 @@ VARIABLE						*fern-variable*
 	is a key of |g:fern#renderers|.
 	Default: "default"
 
+*g:fern#enable_textprop_support*
+	If set to 1, renderers may return lines of text with text properties.
+	May incur slight performance penalty. See |fern-develop-renderer|.
+	Default: 0
+
 *g:fern#comparator*
 	A |String| name of comparator used to sort tree items. Allowed value
 	is a key of |g:fern#comparators|.

test/fern/internal/buffer.vimspec

@@ -5,6 +5,16 @@ Describe fern#internal#buffer
 
   Before
     %bwipeout!
+    if !has('nvim')
+      call prop_type_add('test_prop', { 'highlight': 'Question' })
+    endif
+  End
+
+  After
+    let g:fern#enable_textprop_support = 0
+    if !has('nvim')
+      call prop_type_delete('test_prop')
+    endif
   End
 
   Describe #replace()
@@ -115,6 +125,45 @@ Describe fern#internal#buffer
             \])
       Assert Equals(getbufvar(bufnr, '&modified'), 1)
     End
+
+    It should replace buffer content with text and properties
+      if has('nvim')
+        Assert Skip('text properties are only supported in vim')
+      endif
+
+      let g:fern#enable_textprop_support = 1
+
+      let bufnr = bufnr('%')
+      call setline(1, [
+            \ "Hello",
+            \ "Darkness",
+            \ "My",
+            \ "Old",
+            \ "Friend",
+            \])
+      new
+      call fern#internal#buffer#replace(bufnr, [
+            \ { 'text': 'Empty Props', 'props': [] },
+            \ { 'text': 'Undefined Props' },
+            \ { 'text': 'With Properties!', 'props':
+            \   [{ 'col': 1, 'length': 4, 'type': 'test_prop' }]
+            \ },
+            \])
+      Assert Equals(getbufline(bufnr, 1, '$'), [
+            \ "Empty Props",
+            \ "Undefined Props",
+            \ "With Properties!",
+            \])
+
+      Assert True(empty(prop_list(1, { 'bufnr': bufnr })))
+      Assert True(empty(prop_list(2, { 'bufnr': bufnr })))
+
+      let result_props = prop_list(3, { 'bufnr': bufnr })
+      Assert Equal(len(result_props), 1)
+      Assert Equal(result_props[0].col, 1)
+      Assert Equal(result_props[0].length, 4)
+      Assert Equal(result_props[0].type, 'test_prop')
+    End
   End
 
   Describe #open()