feature: Allow signs to be disabled per component

## Details

Request: #64

Currently the controls that exist around sign column rendering are at
a buffer level. Meaning either all signs are rendered for a particular
buffer or none of them are.

There are 2 components that can render into the sign column, headings
& code blocks.

Add a 'sign' field to both of these which can be toggled on / off.

If the 'sign' field is set to false then do not attempt to render any signs
for that component. These component level settings are checked first, before
any of the buffer level ones, meaning they have the highest presedence.

Other minor changes made:

- Split heading icon & background to 2 different extmarks
- Have each handler set 'render.md.Handler' as a parent class, this
  fixes the diagnostic error so no longer needs to be disabled
- Make logger a class, missed this when adding everywhere else
- Add more methods to logger
- Have all other methods call into logger.error / logger.debug to avoid
  checking same condition in multiple places
- Add UserWindowOption type to avoid type errors when only default or
  rendered is set, align with health check and use number or string
  instead of any

Author: MeanderingProgrammer

Diff for: README.md

@@ -174,12 +174,14 @@ require('render-markdown').setup({
     heading = {
         -- Turn on / off heading icon & background rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Replaces '#+' of 'atx_h._marker'
         -- The number of '#' in the heading determines the 'level'
         -- The 'level' is used to index into the array using a cycle
         -- The result is left padded with spaces to hide any additional '#'
         icons = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-        -- Added to the sign column
+        -- Added to the sign column if enabled
         -- The 'level' is used to index into the array using a cycle
         signs = { '󰫎 ' },
         -- The 'level' is used to index into the array using a clamp
@@ -199,10 +201,12 @@ require('render-markdown').setup({
     code = {
         -- Turn on / off code block & inline code rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Determines how code blocks & inline code are rendered:
         --  none: disables all rendering
         --  normal: adds highlight group to code blocks & inline code
-        --  language: adds language icon to sign column and icon + name above code blocks
+        --  language: adds language icon to sign column if enabled and icon + name above code blocks
         --  full: normal + language
         style = 'full',
         -- Determins how the top / bottom of code block are rendered:
@@ -383,12 +387,14 @@ require('render-markdown').setup({
     heading = {
         -- Turn on / off heading icon & background rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Replaces '#+' of 'atx_h._marker'
         -- The number of '#' in the heading determines the 'level'
         -- The 'level' is used to index into the array using a cycle
         -- The result is left padded with spaces to hide any additional '#'
         icons = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-        -- Added to the sign column
+        -- Added to the sign column if enabled
         -- The 'level' is used to index into the array using a cycle
         signs = { '󰫎 ' },
         -- The 'level' is used to index into the array using a clamp
@@ -415,10 +421,12 @@ require('render-markdown').setup({
     code = {
         -- Turn on / off code block & inline code rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Determines how code blocks & inline code are rendered:
         --  none: disables all rendering
         --  normal: adds highlight group to code blocks & inline code
-        --  language: adds language icon to sign column and icon + name above code blocks
+        --  language: adds language icon to sign column if enabled and icon + name above code blocks
         --  full: normal + language
         style = 'full',
         -- Determins how the top / bottom of code block are rendered:

Diff for: doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*           For 0.10.0           Last change: 2024 July 13
+*render-markdown.txt*           For 0.10.0           Last change: 2024 July 15
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*
@@ -212,12 +212,14 @@ Full Default Configuration ~
         heading = {
             -- Turn on / off heading icon & background rendering
             enabled = true,
+            -- Turn on / off any sign column related rendering
+            sign = true,
             -- Replaces '#+' of 'atx_h._marker'
             -- The number of '#' in the heading determines the 'level'
             -- The 'level' is used to index into the array using a cycle
             -- The result is left padded with spaces to hide any additional '#'
             icons = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-            -- Added to the sign column
+            -- Added to the sign column if enabled
             -- The 'level' is used to index into the array using a cycle
             signs = { '󰫎 ' },
             -- The 'level' is used to index into the array using a clamp
@@ -237,10 +239,12 @@ Full Default Configuration ~
         code = {
             -- Turn on / off code block & inline code rendering
             enabled = true,
+            -- Turn on / off any sign column related rendering
+            sign = true,
             -- Determines how code blocks & inline code are rendered:
             --  none: disables all rendering
             --  normal: adds highlight group to code blocks & inline code
-            --  language: adds language icon to sign column and icon + name above code blocks
+            --  language: adds language icon to sign column if enabled and icon + name above code blocks
             --  full: normal + language
             style = 'full',
             -- Determins how the top / bottom of code block are rendered:
@@ -420,12 +424,14 @@ HEADINGS                                      *render-markdown-setup-headings*
         heading = {
             -- Turn on / off heading icon & background rendering
             enabled = true,
+            -- Turn on / off any sign column related rendering
+            sign = true,
             -- Replaces '#+' of 'atx_h._marker'
             -- The number of '#' in the heading determines the 'level'
             -- The 'level' is used to index into the array using a cycle
             -- The result is left padded with spaces to hide any additional '#'
             icons = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-            -- Added to the sign column
+            -- Added to the sign column if enabled
             -- The 'level' is used to index into the array using a cycle
             signs = { '󰫎 ' },
             -- The 'level' is used to index into the array using a clamp
@@ -453,10 +459,12 @@ CODE BLOCKS                                *render-markdown-setup-code-blocks*
         code = {
             -- Turn on / off code block & inline code rendering
             enabled = true,
+            -- Turn on / off any sign column related rendering
+            sign = true,
             -- Determines how code blocks & inline code are rendered:
             --  none: disables all rendering
             --  normal: adds highlight group to code blocks & inline code
-            --  language: adds language icon to sign column and icon + name above code blocks
+            --  language: adds language icon to sign column if enabled and icon + name above code blocks
             --  full: normal + language
             style = 'full',
             -- Determins how the top / bottom of code block are rendered:

Diff for: lua/render-markdown/handler/latex.lua

@@ -10,7 +10,7 @@ local cache = {
     expressions = {},
 }
 
----@class render.md.handler.Latex
+---@class render.md.handler.Latex: render.md.Handler
 local M = {}
 
 ---@param namespace integer

Diff for: lua/render-markdown/handler/markdown.lua

@@ -9,7 +9,7 @@ local str = require('render-markdown.str')
 local ts = require('render-markdown.ts')
 local util = require('render-markdown.util')
 
----@class render.md.handler.Markdown
+---@class render.md.handler.Markdown: render.md.Handler
 local M = {}
 
 ---@param namespace integer
@@ -42,15 +42,13 @@ M.render = function(namespace, root, buf)
                 if nested_capture == 'quote_marker' then
                     M.render_quote_marker(namespace, buf, nested_info, info)
                 else
-                    -- Should only get here if user provides custom capture, currently unhandled
-                    logger.error('Unhandled markdown quote capture: ' .. nested_capture)
+                    logger.unhandled_capture('markdown quote', nested_capture)
                 end
             end
         elseif capture == 'table' then
             M.render_table(namespace, buf, info)
         else
-            -- Should only get here if user provides custom capture, currently unhandled
-            logger.error('Unhandled markdown capture: ' .. capture)
+            logger.unhandled_capture('markdown', capture)
         end
     end
 end
@@ -74,7 +72,6 @@ M.render_heading = function(namespace, buf, info)
     -- is added to account for the space after the last `#` but before the heading title,
     -- and concealed text is subtracted since that space is not usable
     local padding = level + 1 - ts.concealed(buf, info) - str.width(icon)
-
     if padding < 0 then
         -- Requires inline extmarks to place when there is not enough space available
         if util.has_10 then
@@ -85,25 +82,25 @@ M.render_heading = function(namespace, buf, info)
                 virt_text_pos = 'inline',
                 conceal = '',
             })
-            vim.api.nvim_buf_set_extmark(buf, namespace, info.start_row, 0, {
-                end_row = info.end_row + 1,
-                end_col = 0,
-                hl_group = background,
-                hl_eol = true,
-            })
         end
     else
-        vim.api.nvim_buf_set_extmark(buf, namespace, info.start_row, 0, {
-            end_row = info.end_row + 1,
-            end_col = 0,
-            hl_group = background,
+        vim.api.nvim_buf_set_extmark(buf, namespace, info.start_row, info.start_col, {
+            end_row = info.end_row,
+            end_col = info.end_col,
             virt_text = { { str.pad(icon, padding), { foreground, background } } },
             virt_text_pos = 'overlay',
-            hl_eol = true,
         })
     end
+    vim.api.nvim_buf_set_extmark(buf, namespace, info.start_row, 0, {
+        end_row = info.end_row + 1,
+        end_col = 0,
+        hl_group = background,
+        hl_eol = true,
+    })
 
-    M.render_sign(namespace, buf, info, list.cycle(heading.signs, level), foreground)
+    if heading.sign then
+        M.render_sign(namespace, buf, info, list.cycle(heading.signs, level), foreground)
+    end
 end
 
 ---@private
@@ -188,7 +185,9 @@ M.render_language = function(namespace, buf, info, code_block)
     if icon == nil or icon_highlight == nil then
         return false
     end
-    M.render_sign(namespace, buf, info, icon, icon_highlight)
+    if code.sign then
+        M.render_sign(namespace, buf, info, icon, icon_highlight)
+    end
     -- Requires inline extmarks
     if not util.has_10 then
         return false
@@ -351,8 +350,7 @@ M.render_table = function(namespace, buf, info)
             end
             M.render_table_row(namespace, buf, row, pipe_table.row)
         else
-            -- Should only get here if markdown introduces more row types, currently unhandled
-            logger.error('Unhandled markdown row type: ' .. row.type)
+            logger.unhandled_type('markdown', 'row', row.type)
         end
     end
     if pipe_table.style == 'full' then
@@ -411,8 +409,7 @@ M.render_table_row = function(namespace, buf, row, highlight)
                     end
                 end
             else
-                -- Should only get here if markdown introduces more cell types, currently unhandled
-                logger.error('Unhandled markdown cell type: ' .. cell.type)
+                logger.unhandled_type('markdown', 'cell', cell.type)
             end
         end
     elseif pipe_table.cell == 'overlay' then

Diff for: lua/render-markdown/handler/markdown_inline.lua

@@ -6,7 +6,7 @@ local str = require('render-markdown.str')
 local ts = require('render-markdown.ts')
 local util = require('render-markdown.util')
 
----@class render.md.handler.MarkdownInline
+---@class render.md.handler.MarkdownInline: render.md.Handler
 local M = {}
 
 ---@param namespace integer
@@ -25,8 +25,7 @@ M.render = function(namespace, root, buf)
         elseif capture == 'link' then
             M.render_link(namespace, buf, info)
         else
-            -- Should only get here if user provides custom capture, currently unhandled
-            logger.error('Unhandled inline capture: ' .. capture)
+            logger.unhandled_capture('inline', capture)
         end
     end
 end

Diff for: lua/render-markdown/init.lua

@@ -7,9 +7,9 @@ local M = {}
 ---@field public render fun(namespace: integer, root: TSNode, buf: integer)
 ---@field public extends? boolean
 
----@class render.md.WindowOption
----@field public default any
----@field public rendered any
+---@class render.md.UserWindowOption
+---@field public default? number|string
+---@field public rendered? number|string
 
 ---@class render.md.UserSign
 ---@field public enabled? boolean
@@ -58,6 +58,7 @@ local M = {}
 
 ---@class render.md.UserCode
 ---@field public enabled? boolean
+---@field public sign? boolean
 ---@field public style? 'full'|'normal'|'language'|'none'
 ---@field public border? 'thin'|'thick'
 ---@field public above? string
@@ -66,6 +67,7 @@ local M = {}
 
 ---@class render.md.UserHeading
 ---@field public enabled? boolean
+---@field public sign? boolean
 ---@field public icons? string[]
 ---@field public signs? string[]
 ---@field public backgrounds? string[]
@@ -101,7 +103,7 @@ local M = {}
 ---@field public callout? table<string, render.md.UserCustomComponent>
 ---@field public link? render.md.UserLink
 ---@field public sign? render.md.UserSign
----@field public win_options? table<string, render.md.WindowOption>
+---@field public win_options? table<string, render.md.UserWindowOption>
 ---@field public custom_handlers? table<string, render.md.Handler>
 
 ---@type render.md.Config
@@ -179,12 +181,14 @@ M.default_config = {
     heading = {
         -- Turn on / off heading icon & background rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Replaces '#+' of 'atx_h._marker'
         -- The number of '#' in the heading determines the 'level'
         -- The 'level' is used to index into the array using a cycle
         -- The result is left padded with spaces to hide any additional '#'
         icons = { '󰲡 ', '󰲣 ', '󰲥 ', '󰲧 ', '󰲩 ', '󰲫 ' },
-        -- Added to the sign column
+        -- Added to the sign column if enabled
         -- The 'level' is used to index into the array using a cycle
         signs = { '󰫎 ' },
         -- The 'level' is used to index into the array using a clamp
@@ -204,10 +208,12 @@ M.default_config = {
     code = {
         -- Turn on / off code block & inline code rendering
         enabled = true,
+        -- Turn on / off any sign column related rendering
+        sign = true,
         -- Determines how code blocks & inline code are rendered:
         --  none: disables all rendering
         --  normal: adds highlight group to code blocks & inline code
-        --  language: adds language icon to sign column and icon + name above code blocks
+        --  language: adds language icon to sign column if enabled and icon + name above code blocks
         --  full: normal + language
         style = 'full',
         -- Determins how the top / bottom of code block are rendered:

Diff for: lua/render-markdown/logger.lua

@@ -54,6 +54,7 @@ log.flush = function()
     log.reset()
 end
 
+---@class render.md.Logger
 local M = {}
 
 M.start = function()
@@ -67,26 +68,39 @@ M.debug = function(message)
     end
 end
 
----@param capture string
----@param info render.md.NodeInfo
-M.debug_node_info = function(capture, info)
-    if vim.tbl_contains({ 'debug' }, state.config.log_level) then
-        log.add('debug', {
-            capture = capture,
-            text = info.text,
-            rows = { info.start_row, info.end_row },
-            cols = { info.start_col, info.end_col },
-        })
-    end
-end
-
 ---@param message any
 M.error = function(message)
     if vim.tbl_contains({ 'debug', 'error' }, state.config.log_level) then
         log.add('error', message)
     end
 end
 
+---@param capture string
+---@param info render.md.NodeInfo
+M.debug_node_info = function(capture, info)
+    M.debug({
+        capture = capture,
+        text = info.text,
+        rows = { info.start_row, info.end_row },
+        cols = { info.start_col, info.end_col },
+    })
+end
+
+---Encountered if user provides custom capture
+---@param group string
+---@param capture string
+M.unhandled_capture = function(group, capture)
+    M.error(string.format('Unhandled %s capture: %s', group, capture))
+end
+
+---Encountered if new type is seen for a particular group
+---@param language string
+---@param group string
+---@param value string
+M.unhandled_type = function(language, group, value)
+    M.error(string.format('Unhandled %s %s type: %s', language, group, value))
+end
+
 M.flush = function()
     log.flush()
 end