From 798c6eb608c094d4fc7b965494ae9c6d3ce78b0e Mon Sep 17 00:00:00 2001
From: CronyAkatsuki <crony@cronyakatsuki.xyz>
Date: Wed, 27 Dec 2023 20:31:31 +0100
Subject: [PATCH] Implement promoting and demoting headers.

---
 lua/md-tools/init.lua | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 lua/md-tools/init.lua

diff --git a/lua/md-tools/init.lua b/lua/md-tools/init.lua
new file mode 100644
index 0000000..27d31da
--- /dev/null
+++ b/lua/md-tools/init.lua
@@ -0,0 +1,38 @@
+local M = {}
+local header_regex = "^(#+) (.+)"
+
+M.promote = function()
+	if vim.api.nvim_get_mode().mode == "n" then
+		local current_line = vim.api.nvim_get_current_line()
+		local row, col = unpack(vim.api.nvim_win_get_cursor(0))
+		local new_line = ""
+
+		if current_line:match(header_regex) then
+			if current_line:match("^# (.+)") then
+				vim.notify("You can't promote this header anymore")
+				return
+			end
+			new_line = current_line:gsub("^#", "", 1)
+			vim.api.nvim_buf_set_lines(0, row - 1, row, true, { new_line })
+		end
+	end
+end
+
+M.demote = function()
+	if vim.api.nvim_get_mode().mode == "n" then
+		local current_line = vim.api.nvim_get_current_line()
+		local row, col = unpack(vim.api.nvim_win_get_cursor(0))
+		local new_line = ""
+
+		if current_line:match(header_regex) then
+			if current_line:match("^###### (.+)") then
+				vim.notify("You can't demote this header anymore")
+				return
+			end
+			new_line = current_line:gsub("^#", "##", 1)
+			vim.api.nvim_buf_set_lines(0, row - 1, row, true, { new_line })
+		end
+	end
+end
+
+return M