okay, we good now. i think.

README.md

@@ -1,20 +1,12 @@
 # LuaComp
-A general purpose Lua preprocessor and minifier.
+A general purpose preprocessor and postprocessor written in Lua.
 
 ## Building
-To build, either execute `luapreproc` or `luacomp` on src/init.lua
-
-### luapreproc
-Execute `luapreproc init.lua ../luacomp.lua`
-
-### luacomp
-Execute `luacomp init.lua -xO ../luacomp.lua`
-
-***NOTE***: Do not use a minifier, it breaks argparse!
+See manual/README.md
 
 ## How-To
 
-### Merging Lua source files
+### Merging source files
 ```lua
 -- myfile.lua
 local my_lib = {}

examples/error.lua

@@ -0,0 +1,2 @@
+--#error "What a scam"
+print("I never get printed.")

manual/README.md

@@ -0,0 +1,120 @@
+# Building
+
+## Luapreproc
+```sh
+git clone https://github.com/Adorable-Catgirl/LuaComp.git
+cd LuaComp
+luapreproc src/init.lua /tmp/luacomp.part
+echo "#!/usr/bin/env lua5.3" | cat - /tmp/luacomp.part > ~/bin/luacomp
+chmod +x ~/bin/luacomp
+```
+
+## LuaComp
+```sh
+git clone https://github.com/Adorable-Catgirl/LuaComp.git
+cd LuaComp
+luacomp -xlua5.3 -mluamin -O ~/bin/luacomp src/init.lua
+chmod +x ~/bin/luacomp
+```
+
+## By hand
+Ha, no.
+
+# Usage
+`luacomp -h` outputs:
+```
+Usage: /tmp/luacomp [-h] [-O <output>] [-m <minifier>]
+       [--generator-code] [--verbose] [--post-processors]
+       [--directives] [-v] <input> [-x [<executable>]]
+
+LuaComp v1.2.0
+A preprocessor+postprocessor written in Lua.
+
+Arguments:
+   input                 Input file (- for STDIN)
+
+Options:
+   -h, --help            Show this help message and exit.
+         -O <output>,    Output file. (- for STDOUT) (default: -)
+   --output <output>
+           -m <minifier>,
+   --minifier <minifier>
+                         Sets the minifier (default: none)
+             -x [<executable>],
+   --executable [<executable>]
+                         Makes the script an executable (default: current lua version)
+   --generator-code      Outputs only the code from the generator.
+   --verbose             Verbose output. (Debugging)
+   --post-processors     Lists postprocessors
+   --directives          Lists directives
+   -v, --version         Prints the version and exits
+```
+# Directives
+LuaComp currently ships with four built-in directives. More directives can be installed at `/usr/share/luacomp/directives` and `~/.local/share/luacomp/directives`.
+
+## include
+Usage: `--#include "path"`
+Include tells the preprocessor to include the file specified. The file included will also be preprocessed.
+
+## define
+Usage `--#define "var" "value"`
+Defines the env var for this session.
+
+## error
+Usage `--#error "text"`
+Throws an error and stops the preprocessor.
+
+## loadmod
+**Note**: Depreciated, use the directive dirs.
+Usage `--#loadmod "lua_file.lua"`
+Loads a directive module. Don't use this. I just don't want to have to bump the major version number.
+
+# Postprocessors
+LuaComp currently ships with built-in support for three postprocessors. More can be installed at `/usr/share/luacomp/postproc` and `~/.local/share/luacomp/postproc`
+
+## luamin
+Language: Lua 5.1 to 5.3
+Minifies Lua.
+
+## uglify
+Language: JavaScript
+Minifies JS. Options are `--compress --mangle`.
+
+## bython(2)
+Language: Bython (Python 3.x and 2.x)
+Turns Bython into Python.
+
+# Syntax
+The syntax was made for Lua, but it works well enough for some other languages.
+
+## Directives
+Syntax: `--#directive "arguments"`
+
+## Lua code
+Syntax: `@[[ code ]]`
+Note that this can be used for macros.
+See examples/macro.lua.
+
+## Lua variable
+Syntax: `@[{ variable }]`
+Puts the value of the variable in the code
+
+## Quoted shell variables
+Syntax: `$(var)`
+Puts the value of the variable in the code, quoted.
+
+## Unquoted shell variables
+Syntax: `$[{var}]`
+Puts the value of the variable in the code, not quoted.
+
+## Shell output
+Syntax: `$[[code]]`
+Puts the stdout of the script in the code. Note that you can't set variables from the shell script.
+
+# Debugging
+
+## Generator code
+To output the code the generator executes, add the `--generator-code` flag.
+
+## Debug messages
+To output debug messages, add the `--verbose` flag.

src/application.lua

@@ -15,13 +15,15 @@ end
 --#include "src/directive_provider.lua"
 --#include "src/cfg/minifier_providers.lua"
 
-local parser = argparse(arg[0], "LuaComp v"..LUACOMP_VERSION.."\nA Lua preprocessor+postprocessor.")
+local parser = argparse(arg[0], "LuaComp v"..LUACOMP_VERSION.."\nA preprocessor+postprocessor written in Lua.")
 parser:argument("input", "Input file (- for STDIN)")
 parser:option("-O --output", "Output file. (- for STDOUT)", "-")
-parser:option("-m --minifier", "Sets the minifier", "none")
+parser:option("-m --minifier", "Sets the postprocessor", "none")
 parser:option("-x --executable", "Makes the script an executable (default: current lua version)"):args "?"
 parser:flag("--generator-code", "Outputs only the code from the generator.")
 parser:flag("--verbose", "Verbose output. (Debugging)"):action(function() VERBOSE=true end)
+parser:flag("--post-processors", "Lists postprocessors"):action(function() preload_providers() for k, v in pairs(providers) do print(k) end os.exit(0) end)
+parser:flag("--directives", "Lists directives"):action(function() preload_directives() for k, v in pairs(directives) do print(k) end os.exit(0) end)
 parser:flag("-v --version", "Prints the version and exits"):action(function()
 	print(LUACOMP_VERSION)
 	os.exit(0)
@@ -47,14 +49,14 @@ local ocode = generate(ast, args.generator_code)
 local minifier = providers[args.minifier]
 dprint("Minifier: "..args.minifier, minifier)
 if not minifier then
-	io.stderr:write("ERROR: Minifier `"..args.minifier.."' not found!\n")
+	io.stderr:write("ERROR: Postprocessor `"..args.minifier.."' not found!\n")
 	os.exit(1)
 end
 dprint("Running...")
 local rcode, err = minifier(ocode)
 
 if (not rcode) then
-	io.stderr:write("ERROR: Error for minifier `"..args.minifier.."': \n")
+	io.stderr:write("ERROR: Error for postprocessor `"..args.minifier.."': \n")
 	io.stderr:write(err)
 	os.exit(1)
 end

src/cfg/directive_providers.lua

@@ -0,0 +1,4 @@
+local directive_paths = {
+	"/usr/share/luacomp/directives",
+	os.getenv("HOME").."/.local/share/luacomp/directives"
+}

src/cfg/minifier_providers.lua

@@ -16,6 +16,11 @@
    limitations under the License.
 ]]
 
+local postproc_paths = {
+	"/usr/share/luacomp/postproc",
+	os.getenv("HOME").."/.local/share/luacomp/postproc"
+}
+
 local providers = {}
 
 function providers.luamin(cin)
@@ -92,4 +97,27 @@ end
 
 function providers.none(cin)
 	return cin
+end
+
+setmetatable(providers, {__index=function(t, i)
+	for i=1, #postproc_paths do
+		if (os.execute("stat "..postproc_paths[i].."/"..i..".lua 1>/dev/null 2>&1")) then
+			providers[i] = loadfile(postproc_paths[i].."/"..i..".lua")()
+			return providers[i]
+		end
+	end
+end})
+
+local function preload_providers()
+	--Do this in the best way possible
+	for i=1, #postproc_paths do
+		if (os.execute("stat "..postproc_paths[i].."1>/dev/null 2>&1")) then
+			local fh = io.popen("ls "..postproc_paths[i], "r")
+			for line in fh:lines() do
+				if (line:match("%.lua$")) then
+					providers[line:sub(1, #line-4)] = loadfile(postproc_paths[i].."/"..line)()
+				end
+			end
+		end
+	end
 end

src/directive_provider.lua

@@ -16,7 +16,31 @@
    limitations under the License.
 ]]
 
+--#include "src/cfg/directive_providers.lua"
 --#include "src/directives/define.lua"
 --#include "src/directives/include.lua"
 --#include "src/directives/loadmod.lua"
 --#include "src/directives/error.lua"
+
+setmetatable(directives, {__index=function(t, i)
+   for i=1, #directive_paths do
+      if (os.execute("stat "..directive_paths[i].."/"..i..".lua 1>/dev/null 2>&1")) then
+         directives[i] = loadfile(directive_paths[i].."/"..i..".lua")()
+         return directives[i]
+      end
+   end
+end})
+
+local function preload_directives()
+   --Do this in the best way possible
+   for i=1, #directive_paths do
+      if (os.execute("stat "..directive_paths[i].." 1>/dev/null 2>&1")) then
+         local fh = io.popen("ls "..directive_paths[i], "r")
+         for line in fh:lines() do
+            if (line:match("%.lua$")) then
+               directives[line:sub(1, #line-4)] = loadfile(directive_paths[i].."/"..line)()
+            end
+         end
+      end
+   end
+end

src/directives/loadmod.lua

@@ -1,7 +1,7 @@
 local warned = false
 function directives.loadmod(env, mod)
 	if not warned then
-		io.stderr:write("Warning: loadmod is depreciated and unsafe. The API differs from luapreproc.\n")
+		io.stderr:write("Warning: loadmod is depreciated and unsafe. The API differs from luapreproc. Use the include paths!\n")
 		warned = true
 	end
 	if (not os.execute("stat "..file..">/dev/null")) then