feat: use matchpairs for bracket matching

* Dynamically load bracket pairs from vim.o.matchpairs instead of hardcoding
* Fix comment matching position to align with vim behavior
* Add cpoptions=M for proper bracket matching in tests

lua/precognition/horizontal_motions.lua

@@ -1,11 +1,24 @@
 local M = {}
 
+local pairs = vim.split(vim.o.matchpairs, ",")
+
+-- local match_bracket_escape = not vim.o.cpoptions:find("M")
+
 local supportedBrackets = {
-    open = { "(", "[", "{" },
-    middle = { nil, nil, nil },
-    close = { ")", "]", "}" },
+    open = {},
+    middle = {},
+    close = {},
 }
 
+for _, pair in ipairs(pairs) do
+    local open, close = pair:match("(.):(.)")
+    if open and close then
+        table.insert(supportedBrackets.open, open)
+        table.insert(supportedBrackets.middle, nil)
+        table.insert(supportedBrackets.close, close)
+    end
+end
+
 ---@param str string
 ---@param _cursorcol integer
 ---@param _linelen integer
@@ -264,7 +277,7 @@ function M.matching_comment(str, cursorcol, linelen)
             next_char = vim.fn.strcharpart(str, offset, 1)
             if char == "*" and next_char == "/" then
                 -- return the slash of the closing comment
-                return offset + 1
+                return offset
             end
             offset = offset + 1
         end

tests/precognition/dts.lua

@@ -15,6 +15,10 @@ local M = {}
 function M.test(seed)
     local data = dts.generate_random_line(seed)
 
+    --TODO: Currently bracket matching only works with M cpoptions
+    --see  `:h %`
+    vim.o.cpoptions = vim.o.cpoptions .. "M"
+
     local cur_line = data.line
     local cursorcol = data.cursor_col
     local line_len = vim.fn.strcharlen(cur_line)

tests/precognition/horizontal_motions_spec.lua

@@ -254,8 +254,8 @@ end)
 describe("matching comments", function()
     it("if cursor is over a comment it can find the pair", function()
         local str = "abc /*efg*/"
-        eq(11, hm.matching_comment(str, 5, #str))
-        eq(11, hm.matching_comment(str, 6, #str))
+        eq(10, hm.matching_comment(str, 5, #str))
+        eq(10, hm.matching_comment(str, 6, #str))
         eq(0, hm.matching_comment(str, 7, #str))
         eq(5, hm.matching_comment(str, 10, #str))
         eq(5, hm.matching_comment(str, 11, #str))