From 31157deb353acd0233e56cdf8ebf1fbe201631b3 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Thu, 16 Apr 2026 13:17:30 +0200
Subject: inital commit

---
 src/arg.lua   | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/blueprint |  16 ++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 src/arg.lua
 create mode 100755 src/blueprint

(limited to 'src')

diff --git a/src/arg.lua b/src/arg.lua
new file mode 100644
index 0000000..a0acd9c
--- /dev/null
+++ b/src/arg.lua
@@ -0,0 +1,126 @@
+
+local function help(opts)
+
+	io.write(arg[0])
+	io.write(" ")
+
+	for _, v in ipairs(opts) do
+		if v.kind == nil then
+			io.write("[" .. v.name .. "] ")
+		end
+	end
+	io.write("\n")
+
+	local max_width = 0
+
+	for _, v in ipairs(opts) do
+		if v.kind ~= nil then
+			max_width = math.max(v.name:len(), max_width)
+		end
+	end
+
+	for _, v in ipairs(opts) do
+		if v.kind == nil then
+			goto next
+		end
+
+		if v.kind == 'property' then
+			io.write("\t" .. "--" .. v.name .. " <value>")
+		elseif v.kind == 'flag' then
+			io.write("\t" .. "--" .. v.name .. "        ")
+		end
+
+		if v.description ~= nil then
+			io.write(string.rep(" ", max_width - v.name:len()) .. "  " .. "--  ")
+
+			if v.required then
+				io.write("(required) ")
+			end
+
+			io.write(v.description)
+		end
+
+		io.write("\n")
+
+		::next::
+	end
+
+	os.exit()
+end
+
+function string:flag()
+	if self:sub(1, 2) ~= "--" then
+		return nil
+	end
+
+	return self:sub(3)
+end
+
+return function (opts)
+	local args = {}
+
+	local current_index = 1
+	local current_flag = nil
+
+	local params = {}
+
+	for _, v in ipairs(opts) do
+		if v.kind ~= nil then
+			params[v.name] = v
+			args[v.name] = v.default
+		else
+			params[#params + 1] = v
+		end
+	end
+
+	for _, value in ipairs(arg) do
+		local key = nil
+		if current_flag == nil then
+			local flag = value:flag()
+			if flag == nil then
+				local option = params[current_index]
+				current_index = current_index + 1
+
+				if option == nil then
+					print("error: too many arguments")
+					help(opts)
+				end
+
+				key = option.name
+			else
+				local option = params[flag]
+
+				if option == nil then
+					print("error: unknown flag '" .. flag .. "'")
+					help(opts)
+				end
+
+				if option.kind == 'flag' then
+					key = flag
+					value = true
+				else
+					current_flag = flag
+					goto next
+				end
+			end
+		else
+				local option = params[current_flag]
+
+				key = option.name
+				current_flag = nil
+		end
+
+		args[key] = value
+
+		::next::
+	end
+
+	for _, option in ipairs(opts) do
+		if (option.kind == nil or option.required) and args[option.name] == nil then
+			print("error: missing argument '" .. option.name .. "'")
+			help(opts)
+		end
+	end
+
+	return args
+end
diff --git a/src/blueprint b/src/blueprint
new file mode 100755
index 0000000..ab0cba1
--- /dev/null
+++ b/src/blueprint
@@ -0,0 +1,16 @@
+#!/usr/bin/env lua
+
+function setup_package()
+   local str = debug.getinfo(2, "S").source:sub(2)
+   local path = str:match("(.*/)") or "./"
+	 package.path = path .. '?.lua;'
+end
+
+setup_package()
+
+local args = require('arg') {
+	{ name = "path" },
+
+	{ name = "template", description = "some description", kind = "property", required = true },
+	{ name = "flag", description = "other description", kind = "flag" },
+}
-- 
cgit v1.2.3-70-g09d2