OctOS: Add `params` field to applications

Shows parameters for each command in help.

doc/computers/applications.md

@@ -1,11 +1,12 @@
 # Applications with OctOS
 OctOS has a simple framework to allow the player to easily create their own programs for their computers. All you have to do, is place a file in the `bin` directory to tell OctOS about your application, while the code is typically placed in `exec`.
 
-Files in `bin` do not have to follow any naming convention and typically do not even have an extension. They are formatted as shown below, `name` and `exec` being the only required fields. If `name` is not defined, the file name will be used.
+Files in `bin` do not have to follow any naming convention and typically do not even have an extension. They are formatted as shown below, `name` and `exec` being the only required fields. If `name` is not defined, the file name will be used. Parameters are shown just after the command name in help, and just before the description.
 
 ```
 name = <name>
 description = <description>
+params = <parameters>
 exec = <path to code (e.g. os/exec/help.lua)>
 ```
 

octos/bin/echo

@@ -1,3 +1,4 @@
 name = echo
 description = Print text to the command line
+params = [text]
 exec = os/exec/echo.lua

octos/bin/help

@@ -1,3 +1,4 @@
 name = help
 description = Show help information
+params = [command / "all"]
 exec = os/exec/help.lua

octos/bin/lua

@@ -1,3 +1,4 @@
 name = lua
 description = Execute Lua code
+params = [code]
 exec = os/exec/lua.lua

octos/exec/help.lua

@@ -5,7 +5,12 @@ local bin    = get_userdata("bin")
 
 if params[1] == "all" then
   for name, info in pairs(bin) do
-    print(name..": "..info.description)
+    local params = ""
+    if info.params then
+      params = " "..info.params
+    end
+
+    print(name..params..": "..info.description)
   end
 else
   print("Specify a command to get help for or use help all to view help for all commands.")

octos/start.lua

@@ -16,6 +16,7 @@ for _,f in ipairs(bin_contents.files) do
 
   bin[name] = {
     description = cmd_info.description or "",
+    params = cmd_info.params or "",
     exec = cmd_info.exec or "os/exec/nil"
   }
 end