feature: Make callout matching case insensitive

## Details

Request: #74

Make callout.raw comparison with text use string.lower().

Author: MeanderingProgrammer

README.md

@@ -330,7 +330,7 @@ require('render-markdown').setup({
     -- Callouts are a special instance of a 'block_quote' that start with a 'shortcut_link'
     -- Can specify as many additional values as you like following the pattern from any below, such as 'note'
     --   The key in this case 'note' is for healthcheck and to allow users to change its values
-    --   'raw': Matched against the raw text of a 'shortcut_link'
+    --   'raw': Matched against the raw text of a 'shortcut_link', case insensitive
     --   'rendered': Replaces the 'raw' value when rendering
     --   'highlight': Highlight for the 'rendered' text and quote markers
     callout = {
@@ -601,7 +601,7 @@ require('render-markdown').setup({
     -- Callouts are a special instance of a 'block_quote' that start with a 'shortcut_link'
     -- Can specify as many additional values as you like following the pattern from any below, such as 'note'
     --   The key in this case 'note' is for healthcheck and to allow users to change its values
-    --   'raw': Matched against the raw text of a 'shortcut_link'
+    --   'raw': Matched against the raw text of a 'shortcut_link', case insensitive
     --   'rendered': Replaces the 'raw' value when rendering
     --   'highlight': Highlight for the 'rendered' text and quote markers
     callout = {

demo/callout.gif

@@ -26,10 +26,10 @@
 
 # Caution
 
-> [!CAUTION]
+> [!caution]
 > Cautionary tale
 
 # Bug
 
-> [!BUG]
+> [!bUg]
 > Custom bug

demo/callout.md

@@ -1,4 +1,4 @@
-*render-markdown.txt*           For 0.10.0           Last change: 2024 July 18
+*render-markdown.txt*           For 0.10.0           Last change: 2024 July 19
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*
@@ -370,7 +370,7 @@ Full Default Configuration ~
         -- Callouts are a special instance of a 'block_quote' that start with a 'shortcut_link'
         -- Can specify as many additional values as you like following the pattern from any below, such as 'note'
         --   The key in this case 'note' is for healthcheck and to allow users to change its values
-        --   'raw': Matched against the raw text of a 'shortcut_link'
+        --   'raw': Matched against the raw text of a 'shortcut_link', case insensitive
         --   'rendered': Replaces the 'raw' value when rendering
         --   'highlight': Highlight for the 'rendered' text and quote markers
         callout = {
@@ -647,7 +647,7 @@ CALLOUTS                                      *render-markdown-setup-callouts*
         -- Callouts are a special instance of a 'block_quote' that start with a 'shortcut_link'
         -- Can specify as many additional values as you like following the pattern from any below, such as 'note'
         --   The key in this case 'note' is for healthcheck and to allow users to change its values
-        --   'raw': Matched against the raw text of a 'shortcut_link'
+        --   'raw': Matched against the raw text of a 'shortcut_link', case insensitive
         --   'rendered': Replaces the 'raw' value when rendering
         --   'highlight': Highlight for the 'rendered' text and quote markers
         callout = {

doc/render-markdown.txt

@@ -15,9 +15,9 @@ M.callout = function(text, comparison)
     ---@return boolean
     local function matches(callout)
         if comparison == 'exact' then
-            return text == callout.raw
+            return text:lower() == callout.raw:lower()
         elseif comparison == 'contains' then
-            return text:find(callout.raw, 1, true) ~= nil
+            return text:lower():find(callout.raw:lower(), 1, true) ~= nil
         else
             error(string.format('Unhandled comparison: %s', comparison))
         end

lua/render-markdown/component.lua

@@ -342,7 +342,7 @@ M.default_config = {
     -- Callouts are a special instance of a 'block_quote' that start with a 'shortcut_link'
     -- Can specify as many additional values as you like following the pattern from any below, such as 'note'
     --   The key in this case 'note' is for healthcheck and to allow users to change its values
-    --   'raw': Matched against the raw text of a 'shortcut_link'
+    --   'raw': Matched against the raw text of a 'shortcut_link', case insensitive
     --   'rendered': Replaces the 'raw' value when rendering
     --   'highlight': Highlight for the 'rendered' text and quote markers
     callout = {