Added support for rendering bullet icons depending on item level.

- To calculate the level of the list_item the number of parent nodes
  with type "list" is counted.
- Replaced config option bullet string with bullets string[]

Closes #1

Author: redimp

README.md

@@ -85,8 +85,8 @@ require('render-markdown').setup({
     render_modes = { 'n', 'c' },
     -- Characters that will replace the # at the start of headings
     headings = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-    -- Character to use for the bullet point in lists
-    bullet = '○',
+    -- Character to use for the bullet points in lists
+    bullets = {"●","○","◆","◇"},
     -- Character that will replace the > at the start of block quotes
     quote = '┃',
     -- See :h 'conceallevel' for more information about meaning of values

doc/render-markdown.txt

@@ -112,8 +112,8 @@ modified by the user.
         render_modes = { 'n', 'c' },
         -- Characters that will replace the # at the start of headings
         headings = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-        -- Character to use for the bullet point in lists
-        bullet = '○',
+        -- Character to use for the bullet points in lists
+        bullets = {"●","○","◆","◇"},
         -- Character that will replace the > at the start of block quotes
         quote = '┃',
         -- See :h 'conceallevel' for more information about meaning of values

lua/render-markdown/init.lua

@@ -29,7 +29,7 @@ local M = {}
 ---@field public file_types? string[]
 ---@field public render_modes? string[]
 ---@field public headings? string[]
----@field public bullet? string
+---@field public bullets? string[]
 ---@field public quote? string
 ---@field public conceal? UserConceal
 ---@field public fat_tables? boolean
@@ -71,7 +71,7 @@ function M.setup(opts)
         file_types = { 'markdown' },
         render_modes = { 'n', 'c' },
         headings = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-        bullet = '○',
+        bullets = {"●","○","◆","◇"},
         quote = '┃',
         conceal = {
             default = vim.opt.conceallevel:get(),

lua/render-markdown/state.lua

@@ -24,7 +24,7 @@
 ---@field public file_types string[]
 ---@field public render_modes string[]
 ---@field public headings string[]
----@field public bullet string
+---@field public bullets string[]
 ---@field public quote string
 ---@field public conceal Conceal
 ---@field public fat_tables boolean

lua/render-markdown/ui.lua

@@ -37,6 +37,28 @@ M.refresh = function()
     end)
 end
 
+--- Walk through all parent nodes and count the number of nodes with type list
+--- to calculate the level of the given node
+---@param node TSNode
+---@return integer
+M.calculate_list_level = function(node)
+    local candidate = node:parent()
+    local level = 0
+    while candidate ~= nil do
+        local candidate_type = candidate:type()
+        if candidate_type == "section" or candidate_type == "document" then
+            -- when reaching a section or the document we are clearly at the
+            -- top of the list
+            break
+        elseif candidate_type == "list" then
+            -- found a list increase the level and continue
+            level = level + 1
+        end
+        candidate = candidate:parent()
+    end
+    return level
+end
+
 ---@param root TSNode
 M.markdown = function(root)
     local highlights = state.config.highlights
@@ -73,7 +95,10 @@ M.markdown = function(root)
             -- edge cases in the parser: https://github.com/tree-sitter-grammars/tree-sitter-markdown/issues/127
             -- As a result we handle leading spaces here, can remove if this gets fixed upstream
             local _, leading_spaces = value:find('^%s*')
-            local virt_text = { string.rep(' ', leading_spaces or 0) .. state.config.bullet, highlights.bullet }
+            -- Get the level of the list_marker by counting the number of parent list nodes
+            local level = M.calculate_list_level(node)
+            local bullet_marker = list.cycle(state.config.bullets, level)
+            local virt_text = { string.rep(' ', leading_spaces or 0) .. bullet_marker, highlights.bullet }
             vim.api.nvim_buf_set_extmark(0, M.namespace, start_row, start_col, {
                 end_row = end_row,
                 end_col = end_col,