feat: add code border none

## Details

Request: #246

Adds `none` to the possible values for `code.border`.

Using this value when paired with `code.disable_background = true`
allows the user to only keep the language icon rendering feature. The
`code.disable_background` feature functions in the same way as
`code.style = 'language'`.

Ideally I would remove the `style` options, it seems better to control
everything more granularly and then group settings under a `preset`
option, but it is what is is, will keep both around even though they end
up being redundant.

Will consider a major version bump that breaks styles in the future.

Author: MeanderingProgrammer

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 ## Pre-release
 
+### Features
+
+- footnote text superscript rendering [#241](https://github.com/MeanderingProgrammer/render-markdown.nvim/issues/241)
+  [634acd5](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/634acd5da964c32f6947cd0c7802d7a116662665)
+  [1b5d117](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/1b5d11734122d9451d2e5e2e567fd61a62822293)
+
+### Bug Fixes
+
+- highlight index width calculation [#212](https://github.com/MeanderingProgrammer/render-markdown.nvim/issues/212)
+  [3a319cd](https://github.com/MeanderingProgrammer/render-markdown.nvim/commit/3a319cdbefebf0079a7012dab6b1bfc18ca5b97f)
+
 ## 7.6.0 (2024-11-25)
 
 ### Features

README.md

@@ -328,6 +328,7 @@ require('render-markdown').setup({
         -- Minimum width to use for code blocks when width is 'block'
         min_width = 0,
         -- Determines how the top / bottom of code block are rendered:
+        --  none:  do not render a border
         --  thick: use the same highlight as the code body
         --  thin:  when lines are empty overlay the above & below icons
         border = 'thin',
@@ -775,6 +776,7 @@ require('render-markdown').setup({
         -- Minimum width to use for code blocks when width is 'block'
         min_width = 0,
         -- Determines how the top / bottom of code block are rendered:
+        --  none:  do not render a border
         --  thick: use the same highlight as the code body
         --  thin:  when lines are empty overlay the above & below icons
         border = 'thin',

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*         For 0.10.0         Last change: 2024 November 30
+*render-markdown.txt*         For 0.10.0         Last change: 2024 December 01
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*
@@ -375,6 +375,7 @@ Default Configuration ~
             -- Minimum width to use for code blocks when width is 'block'
             min_width = 0,
             -- Determines how the top / bottom of code block are rendered:
+            --  none:  do not render a border
             --  thick: use the same highlight as the code body
             --  thin:  when lines are empty overlay the above & below icons
             border = 'thin',
@@ -816,6 +817,7 @@ Code Block Configuration ~
             -- Minimum width to use for code blocks when width is 'block'
             min_width = 0,
             -- Determines how the top / bottom of code block are rendered:
+            --  none:  do not render a border
             --  thick: use the same highlight as the code body
             --  thin:  when lines are empty overlay the above & below icons
             border = 'thin',

lua/render-markdown/health.lua

@@ -4,7 +4,7 @@ local state = require('render-markdown.state')
 local M = {}
 
 ---@private
-M.version = '7.6.3'
+M.version = '7.6.4'
 
 function M.check()
     M.start('version')

lua/render-markdown/init.lua

@@ -135,7 +135,7 @@ local M = {}
 ---@alias render.md.code.Style 'full'|'normal'|'language'|'none'
 ---@alias render.md.code.Position 'left'|'right'
 ---@alias render.md.code.Width 'full'|'block'
----@alias render.md.code.Border 'thin'|'thick'
+---@alias render.md.code.Border 'thin'|'thick'|'none'
 
 ---@class (exact) render.md.UserCode
 ---@field public enabled? boolean
@@ -452,6 +452,7 @@ M.default_config = {
         -- Minimum width to use for code blocks when width is 'block'
         min_width = 0,
         -- Determines how the top / bottom of code block are rendered:
+        --  none:  do not render a border
         --  thick: use the same highlight as the code body
         --  thin:  when lines are empty overlay the above & below icons
         border = 'thin',

lua/render-markdown/render/code.lua

@@ -106,24 +106,32 @@ function Render:language()
     if not vim.tbl_contains({ 'language', 'full' }, self.code.style) then
         return false
     end
+
     local node = self.data.language_node
     if node == nil then
         return false
     end
+
     local icon, icon_highlight = Icons.get(node.text)
     if self.code.highlight_language ~= nil then
         icon_highlight = self.code.highlight_language
     end
     if icon == nil or icon_highlight == nil then
         return false
     end
+
     if self.code.sign then
         self:sign(icon, icon_highlight)
     end
+
     local icon_text = icon .. ' '
-    local highlight = { icon_highlight, self.code.highlight }
+    local highlight = { icon_highlight }
+    if self.code.border ~= 'none' then
+        table.insert(highlight, self.code.highlight)
+    end
+
     if self.code.position == 'left' then
-        if self.code.language_name and self.context:width(node) == 0 then
+        if self.code.language_name and self:hidden(node) then
             -- Code blocks will pick up varying amounts of leading white space depending on the
             -- context they are in. This gets lumped into the delimiter node and as a result,
             -- after concealing, the extmark will be left shifted. Logic below accounts for this.
@@ -154,12 +162,16 @@ end
 ---@private
 ---@param icon boolean
 function Render:border(icon)
+    if self.code.border == 'none' then
+        return
+    end
+
     ---@param row integer
     ---@param border string
     ---@param context_hidden boolean
     local function add_border(row, border, context_hidden)
-        local delim_hidden = self.context:width(self.node:child('fenced_code_block_delimiter', row)) == 0
-        if self.code.border == 'thin' and context_hidden and delim_hidden then
+        local delim_node = self.node:child('fenced_code_block_delimiter', row)
+        if self.code.border == 'thin' and context_hidden and self:hidden(delim_node) then
             local width = self.code.width == 'block' and self.data.max_width or vim.o.columns
             self.marks:add('code_border', row, self.data.col, {
                 virt_text = { { border:rep(width - self.data.col), colors.bg_to_fg(self.code.highlight) } },
@@ -170,10 +182,17 @@ function Render:border(icon)
         end
     end
 
-    add_border(self.node.start_row, self.code.above, not icon and self.context:width(self.data.code_node) == 0)
+    add_border(self.node.start_row, self.code.above, not icon and self:hidden(self.data.code_node))
     add_border(self.node.end_row - 1, self.code.below, true)
 end
 
+---@private
+---@param node? render.md.Node
+---@return boolean
+function Render:hidden(node)
+    return self.context:width(node) == 0
+end
+
 ---@private
 ---@param start_row integer
 ---@param end_row integer

lua/render-markdown/state.lua

@@ -174,7 +174,7 @@ function M.validate()
                     :one_of('style', { 'full', 'normal', 'language', 'none' })
                     :one_of('position', { 'left', 'right' })
                     :one_of('width', { 'full', 'block' })
-                    :one_of('border', { 'thin', 'thick' })
+                    :one_of('border', { 'thin', 'thick', 'none' })
                     :check()
             end)
             :nested('dash', function(dash)