From 7b27ad11166e4758b6cf9b01f66f56d4aa7c1ef7 Mon Sep 17 00:00:00 2001
From: Alex Yatskov <alex@foosoft.net>
Date: Sat, 31 Dec 2022 19:51:09 -0800
Subject: [PATCH] Generate guid

---
 lua/guid.lua | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/lua/guid.lua b/lua/guid.lua
index 0dd9257..1c2e842 100644
--- a/lua/guid.lua
+++ b/lua/guid.lua
@@ -1,5 +1,33 @@
-local function guid_insert()
+local function get_cursor_pos()
+    local _, row, col, _ = unpack(vim.fn.getpos('.'))
+    return {row = row, col = col}
+end
 
+local function guid_generate()
+    local bytes = {}
+    for i = 1, 16 do
+        bytes[i] = math.random(0, 255)
+    end
+    return bytes
+end
+
+local function guid_format(guid)
+    return string.format('%.2x%.2x%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x', unpack(guid))
+end
+
+local function insert_text_at_pos(text, pos)
+    local line = vim.fn.getline(pos.row)
+    ---@diagnostic disable-next-line: param-type-mismatch
+    local prefix = string.sub(line, 0, pos.col - 1)
+    ---@diagnostic disable-next-line: param-type-mismatch
+    local suffix = string.sub(line, pos.col)
+    vim.fn.setline(pos.row, prefix .. text .. suffix)
+end
+
+local function guid_insert()
+    local pos = get_cursor_pos()
+    local guid = guid_generate()
+    insert_text_at_pos(guid_format(guid), pos)
 end
 
 return {