feat(previewer): <F6> to toggle preview extend behavior

Author: ibhagwan

README.md

@@ -546,8 +546,9 @@ keymap = {
       ["<F3>"]        = "toggle-preview-wrap",
       ["<F4>"]        = "toggle-preview",
       -- Rotate preview clockwise/counter-clockwise
-      ["<F5>"]        = "toggle-preview-ccw",
-      ["<F6>"]        = "toggle-preview-cw",
+      ["<F5>"]        = "toggle-preview-cw",
+      -- Preview toggle behavior default/extend
+      ["<F6>"]        = "toggle-preview-behavior",
       -- `ts-ctx` binds require `nvim-treesitter-context`
       ["<F7>"]        = "toggle-preview-ts-ctx",
       ["<F8>"]        = "preview-ts-ctx-dec",

lua/fzf-lua/defaults.lua

@@ -100,8 +100,8 @@ M.defaults                      = {
       -- Only valid with the 'builtin' previewer
       ["<F3>"]       = "toggle-preview-wrap",
       ["<F4>"]       = "toggle-preview",
-      ["<F5>"]       = "toggle-preview-ccw",
-      ["<F6>"]       = "toggle-preview-cw",
+      ["<F5>"]       = "toggle-preview-cw",
+      ["<F6>"]       = "toggle-preview-behavior",
       ["<F7>"]       = "toggle-preview-ts-ctx",
       ["<F8>"]       = "preview-ts-ctx-dec",
       ["<F9>"]       = "preview-ts-ctx-inc",

lua/fzf-lua/types.lua

@@ -252,6 +252,7 @@ _G.FzfLua = require("fzf-lua")
 ---@field preview fzf-lua.config.PreviewWinopts
 ---@field on_create fun(e: { winid: integer, bufnr: integer })
 ---@field on_close fun()
+---@field toggle_behavior string?
 ---@field __winhls { main: [string, string][], prev: [string, string][] }
 
 ---@class fzf-lua.config.TreesitterWinopts

lua/fzf-lua/win.lua

@@ -145,12 +145,13 @@ function FzfWin:setup_keybinds()
   self.keymap.fzf = type(self.keymap.fzf) == "table" and self.keymap.fzf or {}
   self.keymap.builtin = type(self.keymap.builtin) == "table" and self.keymap.builtin or {}
   local keymap_tbl = {
-    ["hide"]               = { module = "win", fnc = "hide()" },
-    ["toggle-help"]        = { module = "win", fnc = "toggle_help()" },
-    ["toggle-fullscreen"]  = { module = "win", fnc = "toggle_fullscreen()" },
-    ["toggle-preview"]     = { module = "win", fnc = "toggle_preview()" },
-    ["toggle-preview-cw"]  = { module = "win", fnc = "toggle_preview_cw(1)" },
-    ["toggle-preview-ccw"] = { module = "win", fnc = "toggle_preview_cw(-1)" },
+    ["hide"]                    = { module = "win", fnc = "hide()" },
+    ["toggle-help"]             = { module = "win", fnc = "toggle_help()" },
+    ["toggle-fullscreen"]       = { module = "win", fnc = "toggle_fullscreen()" },
+    ["toggle-preview"]          = { module = "win", fnc = "toggle_preview()" },
+    ["toggle-preview-cw"]       = { module = "win", fnc = "toggle_preview_cw(1)" },
+    ["toggle-preview-ccw"]      = { module = "win", fnc = "toggle_preview_cw(-1)" },
+    ["toggle-preview-behavior"] = { module = "win", fnc = "toggle_preview_behavior()" },
   }
   -- use signal when user bind toggle-preview in FZF_DEFAULT_OPTS/FZF_DEFAULT_FILE_OPTS
   local function on_SIGWINCH_toggle_preview()
@@ -1640,6 +1641,14 @@ function FzfWin.toggle_preview_cw(direction)
   self:redraw()
 end
 
+function FzfWin.toggle_preview_behavior()
+  if not _self then return end
+  local self = _self
+  self.toggle_behavior = not self.toggle_behavior and "extend" or nil
+  utils.info("preview toggle behavior set to %s", self.toggle_behavior or "default")
+  self:redraw()
+end
+
 function FzfWin.toggle_preview_ts_ctx()
   if not _self then return end
   local self = _self