(Range.from_motion) add max_lines and max_cols

lua/u.lua

@@ -511,8 +511,21 @@ function Range.from_lines(bufnr, start_line, stop_line)
   return Range.new(Pos.new(bufnr, start_line, 1), Pos.new(bufnr, stop_line, vim.v.maxcol), 'V')
 end
 
+local BRACKET_MAP = {
+  ['('] = '(',
+  [')'] = '(',
+  ['b'] = '(',
+  ['{'] = '{',
+  ['}'] = '{',
+  ['B'] = '{',
+  ['['] = '[',
+  [']'] = '[',
+  ['<'] = '<',
+  ['>'] = '<',
+}
+
 --- @param motion string
---- @param opts? { bufnr?: number, contains_cursor?: boolean, pos?: u.Pos, user_defined?: boolean }
+--- @param opts? { bufnr?: number, contains_cursor?: boolean, pos?: u.Pos, user_defined?: boolean, max_lines?: number, max_col?: number }
 --- @return u.Range|nil
 function Range.from_motion(motion, opts)
   -- SECTION: Normalize options
@@ -526,6 +539,7 @@ function Range.from_motion(motion, opts)
   local scope, motion_rest = motion:sub(1, 1), motion:sub(2)
   local is_txtobj = scope == 'a' or scope == 'i'
   local is_quote_txtobj = is_txtobj and vim.tbl_contains({ "'", '"', '`' }, motion_rest)
+  local is_bracket_txtobj = is_txtobj and BRACKET_MAP[motion_rest] ~= nil
 
   -- SECTION: Capture original state for restoration
   local original_state = {
@@ -546,6 +560,29 @@ function Range.from_motion(motion, opts)
   vim.api.nvim_buf_call(opts.bufnr, function()
     if opts.pos ~= nil then opts.pos:save_to_pos '.' end
 
+    -- Pre-check: skip expensive g@ when target char not found within bounds
+    if
+      (is_bracket_txtobj or is_quote_txtobj)
+      and type(opts.max_lines) == 'number'
+      and opts.max_lines > 0
+    then
+      local cur = vim.fn.line '.'
+      local line_start = math.max(1, cur - opts.max_lines)
+      local line_end = math.min(vim.api.nvim_buf_line_count(opts.bufnr), cur + opts.max_lines)
+      local chunk = vim.api.nvim_buf_get_lines(opts.bufnr, line_start - 1, line_end, false)
+      local target = is_bracket_txtobj and BRACKET_MAP[motion_rest] or motion_rest
+      local max_col = opts.max_col
+      local found = false
+      for _, line in ipairs(chunk) do
+        local pos = line:find(target, 1, true)
+        if pos and (max_col == nil or pos <= max_col) then
+          found = true
+          break
+        end
+      end
+      if not found then return end
+    end
+
     _G.Range__from_motion_opfunc = function(ty)
       _G.Range__from_motion_opfunc_captured_range = Range.from_op_func(ty)
     end
@@ -663,20 +700,28 @@ function Range.from_cmd_args(args)
   end
 end
 
-function Range.find_nearest_brackets()
+--- @param opts? { max_lines?: number, max_col?: number }
+--- @return u.Range|nil
+function Range.find_nearest_brackets(opts)
+  opts = opts or {}
+  local copts = { contains_cursor = true, max_lines = opts.max_lines, max_col = opts.max_col }
   return Range.smallest {
-    Range.from_motion('a<', { contains_cursor = true }),
-    Range.from_motion('a[', { contains_cursor = true }),
-    Range.from_motion('a(', { contains_cursor = true }),
-    Range.from_motion('a{', { contains_cursor = true }),
+    Range.from_motion('a<', copts),
+    Range.from_motion('a[', copts),
+    Range.from_motion('a(', copts),
+    Range.from_motion('a{', copts),
   }
 end
 
-function Range.find_nearest_quotes()
+--- @param opts? { max_lines?: number, max_col?: number }
+--- @return u.Range|nil
+function Range.find_nearest_quotes(opts)
+  opts = opts or {}
+  local copts = { contains_cursor = true, max_lines = opts.max_lines, max_col = opts.max_col }
   return Range.smallest {
-    Range.from_motion([[a']], { contains_cursor = true }),
-    Range.from_motion([[a"]], { contains_cursor = true }),
-    Range.from_motion([[a`]], { contains_cursor = true }),
+    Range.from_motion([[a']], copts),
+    Range.from_motion([[a"]], copts),
+    Range.from_motion([[a`]], copts),
   }
 end
 

spec/u_spec.lua

@@ -468,6 +468,118 @@ describe('Range', function()
     end)
   end)
 
+  describe('from_motion with max_lines', function()
+    it('returns nil when bracket chars are beyond max_lines', function()
+      -- A large block where { and } are far from cursor
+      local lines = {}
+      lines[1] = '{'
+      for i = 2, 200 do
+        lines[i] = 'content'
+      end
+      lines[201] = '}'
+      withbuf(lines, function()
+        vim.fn.setpos('.', { 0, 100, 1, 0 }) -- cursor inside the block, 99 lines from {
+        -- max_lines=50: { is 99 lines above, } is 101 lines below → pre-check fails
+        local range = Range.from_motion('a{', { max_lines = 50 })
+        assert.is_nil(range)
+      end)
+    end)
+
+    it('finds brackets within max_lines range', function()
+      withbuf({ 'this is a {', 'block', '} here' }, function()
+        vim.fn.setpos('.', { 0, 2, 1, 0 })
+        local range = Range.from_motion('a{', { max_lines = 10 })
+        assert.is_not_nil(range)
+        assert.are.same('{\nblock\n}', range:text())
+      end)
+    end)
+
+    it('works for closing bracket chars ) ] } >', function()
+      withbuf({ 'this is a (', 'block', ') here' }, function()
+        vim.fn.setpos('.', { 0, 2, 1, 0 })
+        local range = Range.from_motion('a)', { max_lines = 10 })
+        assert.is_not_nil(range)
+        assert.are.same('(\nblock\n)', range:text())
+      end)
+    end)
+
+    it('works for b and B aliases', function()
+      withbuf({ 'this is a {', 'block', '} here' }, function()
+        vim.fn.setpos('.', { 0, 2, 1, 0 })
+        local range = Range.from_motion('aB', { max_lines = 10 })
+        assert.is_not_nil(range)
+        assert.are.same('{\nblock\n}', range:text())
+      end)
+    end)
+
+    it('returns nil when quote chars are beyond max_lines', function()
+      local lines = {}
+      for i = 1, 200 do
+        lines[i] = 'no quotes here'
+      end
+      lines[1] = '"quoted"'
+      withbuf(lines, function()
+        vim.fn.setpos('.', { 0, 100, 1, 0 }) -- cursor 99 lines from quote char
+        local range = Range.from_motion('a"', { max_lines = 50 })
+        assert.is_nil(range)
+      end)
+    end)
+
+    it('finds quotes within max_lines range', function()
+      withbuf({ [[the "quick" brown fox]] }, function()
+        vim.fn.setpos('.', { 0, 1, 5, 0 })
+        local range = Range.from_motion('a"', { max_lines = 10 })
+        assert.is_not_nil(range)
+        assert.are.same('"quick"', range:text())
+      end)
+    end)
+
+    it('max_lines nil (default) does not pre-check', function()
+      local lines = {}
+      lines[1] = '{'
+      for i = 2, 200 do
+        lines[i] = 'content'
+      end
+      lines[201] = '}'
+      withbuf(lines, function()
+        vim.fn.setpos('.', { 0, 100, 1, 0 })
+        -- Without max_lines, g@ runs and finds the block
+        local range = Range.from_motion 'a{'
+        assert.is_not_nil(range)
+      end)
+    end)
+
+    it('skips brackets in lines exceeding max_col', function()
+      local long_line = string.rep('x', 10240) .. '{block}'
+      withbuf({ long_line }, function()
+        vim.fn.setpos('.', { 0, 1, 10245, 0 }) -- cursor inside {block}
+        -- { is at col 10241, beyond max_col=10240
+        local range = Range.from_motion('a{', { max_lines = 10, max_col = 10240 })
+        assert.is_nil(range)
+      end)
+    end)
+
+    it('finds brackets within max_col on a long line', function()
+      local long_line = string.rep('x', 100) .. '{block}'
+      withbuf({ long_line }, function()
+        vim.fn.setpos('.', { 0, 1, 105, 0 }) -- cursor inside 'block'
+        local range = Range.from_motion('a{', { max_lines = 10, max_col = 10240 })
+        assert.is_not_nil(range)
+        assert.are.same('{block}', range:text())
+      end)
+    end)
+
+    it('max_col nil (default) does not limit column search', function()
+      local long_line = string.rep('x', 10240) .. '{block}'
+      withbuf({ long_line }, function()
+        vim.fn.setpos('.', { 0, 1, 10245, 0 }) -- cursor inside {block}
+        -- { at col 10241, but no max_col limit
+        local range = Range.from_motion('a{', { max_lines = 10 })
+        assert.is_not_nil(range)
+      end)
+    end)
+  end)
+
   it('from_tsquery_caps', function()
     withbuf({
       '-- a comment',