feat(fzf): add fzf-lua integration for buffer and file selection

lua/opencode.lua

@@ -3,6 +3,7 @@ local M = {}
 
 M.ask = require("opencode.ui.ask").ask
 M.select = require("opencode.ui.select").select
+M.fzf = require("opencode.ui.fzf")
 
 M.prompt = require("opencode.api.prompt").prompt
 M.operator = require("opencode.api.operator").operator

lua/opencode/config.lua

@@ -32,6 +32,9 @@ vim.g.opencode_opts = vim.g.opencode_opts
 ---Supports [`snacks.picker`](https://github.com/folke/snacks.nvim/blob/main/docs/picker.md).
 ---@field select? opencode.select.Opts
 ---
+---Options for `fzf` integration.
+---@field fzf? opencode.fzf.Opts
+---
 ---Options for `opencode` event handling.
 ---@field events? opencode.events.Opts
 ---
@@ -42,6 +45,19 @@ vim.g.opencode_opts = vim.g.opencode_opts
 ---@field prompt string The prompt to send to `opencode`.
 ---@field ask? boolean Call `ask(prompt)` instead of `prompt(prompt)`. Useful for prompts that expect additional user input.
 
+---@class opencode.fzf.Opts
+---
+---Options for file search using fzf-lua.
+---Passed to fzf-lua's files() function.
+---@field files? table
+---
+---Options for buffer search using fzf-lua.
+---Passed to fzf-lua's buffers() function.
+---@field buffers? table
+---
+---Default prompt prefix when selecting files/buffers.
+---@field prompt_prefix? string
+
 ---@type opencode.Opts
 local defaults = {
   port = nil,
@@ -108,6 +124,11 @@ local defaults = {
       },
     },
   },
+  fzf = {
+    files = {},
+    buffers = {},
+    prompt_prefix = "",
+  },
   events = {
     enabled = true,
     reload = true,

lua/opencode/ui/fzf.lua

@@ -0,0 +1,210 @@
+local M = {}
+
+local config = require("opencode.config").opts.fzf or {}
+
+local function is_buf_valid(buf)
+  return vim.api.nvim_get_option_value("buftype", { buf = buf }) == "" and vim.api.nvim_buf_get_name(buf) ~= ""
+end
+
+local function escape_terminal_mode()
+  local mode = vim.api.nvim_get_mode().mode
+  if mode:match("^[it]") then
+    vim.cmd("stopinsert")
+    vim.fn.feedkeys("\27", "n")
+  end
+end
+
+local function strip_ansi_codes(str)
+  local result = str
+  result = result:gsub("\27%[[0-9;]*m", "")
+  result = result:gsub("\27%[K", "")
+  return result
+end
+
+local function strip_file_icon(str)
+  local stripped = strip_ansi_codes(str)
+  stripped = stripped:gsub("^%s*", "")
+  local icon_and_space = stripped:match("^[^\32-\126]+%s+")
+  if icon_and_space then
+    stripped = stripped:sub(#icon_and_space + 1)
+  end
+  return stripped:match("^%s*(.-)%s*$")
+end
+
+local function format_file_for_opencode(filepath)
+  local rel_path = vim.fn.fnamemodify(filepath, ":.")
+  return "@" .. rel_path .. " "
+end
+
+local function send_files_to_opencode(files, prompt_prefix)
+  if not files or #files == 0 then
+    return
+  end
+
+  local file_contexts = {}
+  for _, file in ipairs(files) do
+    local clean_file = strip_file_icon(file)
+    if clean_file and clean_file ~= "" then
+      table.insert(file_contexts, format_file_for_opencode(clean_file))
+    end
+  end
+
+  if #file_contexts == 0 then
+    return
+  end
+
+  local prompt = table.concat(file_contexts, " ")
+  if prompt_prefix and #prompt_prefix > 0 then
+    prompt = prompt_prefix .. " " .. prompt
+  end
+
+  require("opencode").prompt(prompt)
+end
+
+function M.select_buffers(prompt_prefix)
+  escape_terminal_mode()
+
+  local ok, fzf = pcall(require, "fzf-lua")
+  if not ok then
+    vim.notify("fzf-lua not found. Please install fzf-lua to use this feature.", vim.log.levels.ERROR)
+    return
+  end
+
+  local buffers = {}
+  for _, buf in ipairs(vim.api.nvim_list_bufs()) do
+    if is_buf_valid(buf) then
+      local bufname = vim.api.nvim_buf_get_name(buf)
+      table.insert(buffers, {
+        path = bufname,
+        bufnr = buf,
+        ordinal = bufname,
+        display = bufname,
+      })
+    end
+  end
+
+  if #buffers == 0 then
+    vim.notify("No valid buffers found", vim.log.levels.WARN)
+    return
+  end
+
+  local opts = vim.tbl_deep_extend("force", {
+    prompt = "Select buffers> ",
+    previewer = false,
+    file_icons = false,
+    git_icons = false,
+    fzf_opts = {
+      ["--multi"] = "",
+      ["--header"] = "Tab to select multiple, Enter to confirm",
+    },
+    actions = {
+      ["default"] = function(selected)
+        if not selected or #selected == 0 then
+          return
+        end
+        send_files_to_opencode(selected, prompt_prefix or config.prompt_prefix)
+      end,
+    },
+  }, config.buffers or {})
+
+  fzf.fzf_exec(
+    function(cb)
+      for _, buf in ipairs(buffers) do
+        cb(buf.display)
+      end
+      cb(nil)
+    end,
+    opts
+  )
+end
+
+function M.select_files(prompt_prefix, opts)
+  escape_terminal_mode()
+  opts = opts or {}
+
+  local ok, fzf = pcall(require, "fzf-lua")
+  if not ok then
+    vim.notify("fzf-lua not found. Please install fzf-lua to use this feature.", vim.log.levels.ERROR)
+    return
+  end
+
+  local files_opts = vim.tbl_deep_extend("force", {
+    prompt = "Select files> ",
+    previewer = "builtin",
+    file_icons = false,
+    color_icons = false,
+    git_icons = false,
+    fzf_opts = {
+      ["--multi"] = "",
+      ["--header"] = "Tab to select multiple, Enter to confirm",
+    },
+    actions = {
+      ["default"] = function(selected)
+        if not selected or #selected == 0 then
+          return
+        end
+        send_files_to_opencode(selected, prompt_prefix or config.prompt_prefix)
+      end,
+    },
+  }, config.files or {})
+
+  if opts.cwd then
+    files_opts.cwd = opts.cwd
+  end
+
+  fzf.files(files_opts)
+end
+
+function M.ask_with_files(prompt_text)
+  escape_terminal_mode()
+
+  local ok, fzf = pcall(require, "fzf-lua")
+  if not ok then
+    vim.notify("fzf-lua not found. Please install fzf-lua to use this feature.", vim.log.levels.ERROR)
+    return
+  end
+
+  local function show_file_selector()
+    vim.ui.select({ "buffers", "project files" }, { prompt = "Select source: " }, function(choice)
+      if not choice then
+        return
+      end
+
+      if choice == "buffers" then
+        M.select_buffers(prompt_text or config.prompt_prefix)
+      elseif choice == "project files" then
+        M.select_files(prompt_text or config.prompt_prefix)
+      end
+    end)
+  end
+
+  show_file_selector()
+end
+
+function M.append_files_to_current_prompt()
+  escape_terminal_mode()
+
+  local ok, fzf = pcall(require, "fzf-lua")
+  if not ok then
+    vim.notify("fzf-lua not found. Please install fzf-lua to use this feature.", vim.log.levels.ERROR)
+    return
+  end
+
+  local function show_file_selector()
+    vim.ui.select({ "buffers", "project files" }, { prompt = "Select source: " }, function(choice)
+      if not choice then
+        return
+      end
+
+      if choice == "buffers" then
+        M.select_buffers(config.prompt_prefix)
+      elseif choice == "project files" then
+        M.select_files(config.prompt_prefix)
+      end
+    end)
+  end
+
+  show_file_selector()
+end
+
+return M

plugin/fzf.lua

@@ -0,0 +1,34 @@
+if not pcall(require, "fzf-lua") then
+  return
+end
+
+vim.api.nvim_create_user_command("OpencodeFzfBuffers", function(opts)
+  local prompt_prefix = opts.fargs[1] or ""
+  require("opencode").fzf.select_buffers(prompt_prefix)
+end, {
+  nargs = "?",
+  desc = "Select buffers using fzf-lua and send to opencode",
+})
+
+vim.api.nvim_create_user_command("OpencodeFzfFiles", function(opts)
+  local prompt_prefix = opts.fargs[1] or ""
+  require("opencode").fzf.select_files(prompt_prefix)
+end, {
+  nargs = "?",
+  desc = "Select project files using fzf-lua and send to opencode",
+})
+
+vim.api.nvim_create_user_command("OpencodeFzfAsk", function(opts)
+  local prompt_text = opts.fargs[1] or ""
+  require("opencode").fzf.ask_with_files(prompt_text)
+end, {
+  nargs = "?",
+  desc = "Ask opencode with files selected via fzf-lua",
+})
+
+vim.api.nvim_create_user_command("OpencodeFzfAppend", function()
+  require("opencode").fzf.append_files_to_current_prompt()
+end, {
+  nargs = 0,
+  desc = "Append files selected via fzf-lua to current opencode prompt",
+})