feat(file_ignore_patterns): consult the wiki link below

https://github.com/ibhagwan/fzf-lua/wiki#file-ignore-patterns

lua/fzf-lua/config.lua

@@ -736,6 +736,19 @@ function M.normalize_opts(opts, defaults)
       opts[k] or {}, utils.tbl_deep_clone(M.globals[k]) or {})
   end
 
+  -- Merge arrays from globals|defaults, can't use 'vim.tbl_xxx'
+  -- for these as they only work for maps, ie. '{ key = value }'
+  for _, k in ipairs({ 'file_ignore_patterns' }) do
+    for _, m in ipairs({ defaults, M.globals }) do
+      if m[k] then
+        for _, item in ipairs(m[k]) do
+          if not opts[k] then opts[k] = {} end
+          table.insert(opts[k], item)
+        end
+      end
+    end
+  end
+
   -- these options are copied from globals unless specifically set
   -- also check if we need to override 'opts.prompt' from cli args
   -- if we don't override 'opts.prompt' 'FzfWin.save_query' will

lua/fzf-lua/core.lua

@@ -426,6 +426,7 @@ M.mt_cmd_wrapper = function(opts)
       "color_icons",
       "path_shorten",
       "strip_cwd_prefix",
+      "file_ignore_patterns",
       "rg_glob",
       "__module__",
     }

lua/fzf-lua/libuv.lua

@@ -42,13 +42,13 @@ local function find_last_newline(str)
   end
 end
 
---[[ local function find_next_newline(str, start_idx)
+local function find_next_newline(str, start_idx)
   for i=start_idx or 1,#str do
     if string_byte(str, i) == 10 then
         return i
     end
   end
-end ]]
+end
 
 local function process_kill(pid, signal)
   if not pid or not tonumber(pid) then return false end
@@ -93,7 +93,6 @@ M.spawn = function(opts, fn_transform, fn_done)
   local error_pipe = uv.new_pipe(false)
   local write_cb_count = 0
   local prev_line_content = nil
-  -- local num_lines = 0
 
   if opts.fn_transform then fn_transform = opts.fn_transform end
 
@@ -149,33 +148,42 @@ M.spawn = function(opts, fn_transform, fn_done)
     end)
   end
 
-  local function process_lines(data)
+  -- This is the old function used, worked very well
+  -- but couldn't handle 'fn_transform' nil retval
+  -- which we need for 'file_ignore_patterns'
+  --[[ local function process_lines(data)
     -- assert(#data<=66560) -- 65K
     write_cb(data:gsub("[^\n]+",
       function(x)
         return fn_transform(x)
       end))
-  end
+  end ]]
 
-  --[[ local function process_lines(data)
+  local function process_lines(data)
+    local lines = {}
     local start_idx = 1
     repeat
-      num_lines = num_lines + 1
       local nl_idx = find_next_newline(data, start_idx)
-      local line = data:sub(start_idx, nl_idx)
+      local line = data:sub(start_idx, nl_idx-1)
+      -- makes no sense to feed lines
+      -- bigger than 1024 bytes into fzf
       if #line > 1024 then
-        local msg =
-          ("long line detected, consider adding '--max-columns=512' to ripgrep options:\n  %s")
-            :format(utils.strip_ansi_coloring(line):sub(1,60))
-        vim.defer_fn(function()
-          utils.warn(msg)
-        end, 0)
-        line = line:sub(1,512) .. '\n'
+        line = line:sub(1,1024)
+        -- io.stderr:write(string.format("[Fzf-lua] long line detected (%db), "
+        --   .. "consider adding '--max-columns=512' to ripgrep options: %s\n",
+        --   #line, line:sub(1,256)))
       end
-      write_cb(fn_transform(line))
+      line = fn_transform(line)
+      if line then table.insert(lines, line) end
       start_idx = nl_idx + 1
     until start_idx >= #data
-  end --]]
+    -- testing shows better performance writing the entire
+    -- table at once as opposed to calling 'write_cb' for
+    -- every line after 'fn_transform'
+    if #lines > 0 then
+      write_cb(table.concat(lines, "\n").."\n")
+    end
+  end
 
   local read_cb = function(err, data)
 

lua/fzf-lua/make_entry.lua

@@ -303,9 +303,6 @@ M.file = function(x, opts)
   local ret = {}
   local icon, hl
   local file = utils.strip_ansi_coloring(string.match(x, '[^:]*'))
-  -- TODO: this can cause issues with files/grep/live_grep
-  -- process_lines gsub will replace the entry with nil
-  -- **low priority as we never use 'cwd_only' with files/grep
   if opts.cwd_only and path.starts_with_separator(file) then
     local cwd = opts.cwd or vim.loop.cwd()
     if not path.is_relative(file, cwd) then
@@ -331,6 +328,15 @@ M.file = function(x, opts)
   if path.starts_with_separator(x) then
     x = path.HOME_to_tilde(x)
   end
+  -- only check for ignored patterns after './' was
+  -- stripped and path was transformed to relative
+  if opts.file_ignore_patterns then
+    for _, pattern in ipairs(opts.file_ignore_patterns) do
+      if #pattern>0 and x:match(pattern) then
+        return nil
+      end
+    end
+  end
   if opts.path_shorten then
     x = path.shorten(x, tonumber(opts.path_shorten))
   end

lua/fzf-lua/providers/git.lua

@@ -68,6 +68,8 @@ M.status = function(opts)
         f1, f2 = f1:match("(.*)%s%->%s(.*)")
       end
       f1 = f1 and make_entry.file(f1, opts)
+      -- accomodate 'file_ignore_patterns'
+      if not f1 then return end
       f2 = f2 and make_entry.file(f2, opts)
       local staged = git_iconify(x:sub(1,1):gsub("?", " "))
       local unstaged = git_iconify(x:sub(2,2))

lua/fzf-lua/providers/oldfiles.lua

@@ -66,6 +66,8 @@ M.oldfiles = function(opts)
 
   end
 
+  -- for 'file_ignore_patterns' to work on relative paths
+  opts.cwd  = opts.cwd or vim.loop.cwd()
   opts = core.set_header(opts, opts.headers or {"cwd"})
   return core.fzf_exec(contents, opts)
 end