Add some more user-defined registers:HEADmain

  "| - file contents register
  " - visual selection register
  " - timestamp register
  " - uuid register
  " - dirname register

1 files changed, 39 insertions, 0 deletions

diff --git a/lua/vim/userregs/impl/buffercontents.lua b/lua/vim/userregs/impl/buffercontents.lua
new file mode 100644
index 0000000..016b4e5
--- /dev/null
+++ b/lua/vim/userregs/impl/buffercontents.lua
@@ -0,0 +1,39 @@
+local userregs = require("vim.userregs")
+
+-- Register name: "|"
+-- This register represents the full contents of the current buffer.
+-- Yank into it → saves the buffer.
+-- Put from it  → replaces the buffer contents.
+
+local regname = "|"
+
+--- Reads the full contents of the current buffer as a list of lines.
+--- This is returned in the format expected by 'userregfunc'.
+--- @return table a 'put' dictionary with `lines`, `type`, and `additional_data`
+local function read_current_buffer()
+  local bufnr = vim.api.nvim_get_current_buf()
+  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+
+  return {
+    lines = lines,
+    type = "V",  -- linewise register
+    additional_data = {},
+  }
+end
+
+--- Replaces the entire contents of the current buffer with the given content.
+--- Used when yanking into the "|" register.
+--- @param _ string  -- register name (ignored here)
+--- @param content table -- dictionary with `lines` from yankreg_T
+local function write_current_buffer(_, content)
+  local bufnr = vim.api.nvim_get_current_buf()
+
+  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, content.lines or {})
+end
+
+-- Register the "|" register with the userregs framework
+userregs.register_handler(regname, {
+  put = function(_) return read_current_buffer() end,
+  yank = write_current_buffer,
+})
+