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-- Copyright 2007-2013 Mitchell mitchell.att.foicica.com. See LICENSE.
local M = {}
--[[ This comment is for LuaDoc.
---
-- Processes command line arguments for Textadept.
--
-- ## Arg Events
--
-- @field _G.events.ARG_NONE (string)
-- Emitted when no command line arguments are passed to Textadept on startup.
module('args')]]
events.ARG_NONE = 'arg_none'
-- Contains registered command line switches.
-- @class table
-- @name switches
local switches = {}
---
-- Registers a command line switch with short and long versions *short* and
-- *long*, respectively. *narg* is the number of arguments the switch accepts,
-- *f* is the function called when the switch is tripped, and *description* is
-- the switch's description when displaying help.
-- @param short The string short version of the switch.
-- @param long The string long version of the switch.
-- @param narg The number of expected parameters for the switch.
-- @param f The Lua function to run when the switch is tripped.
-- @param description The string description of the switch for command line
-- help.
-- @name register
function M.register(short, long, narg, f, description)
local t = {f, narg, description}
switches[short], switches[long] = t, t
end
---
-- Processes command line argument table *arg*, handling switches previously
-- defined using `args.register()` and treating unrecognized arguments as
-- filenames to open.
-- Emits an `ARG_NONE` event when no arguments are present.
-- @param arg Argument table.
-- @see register
-- @see events
-- @name process
function M.process(arg)
local no_args = true
local i = 1
while i <= #arg do
local switch = switches[arg[i]]
if switch then
local f, n = table.unpack(switch)
local args = {}
for j = i + 1, i + n do args[#args + 1] = arg[j] end
f(table.unpack(args))
i = i + n
else
if not arg[i]:find(not WIN32 and '^/' or '^%u:[/\\]') then
-- Convert relative path to absolute path.
local cwd = arg[-1] or lfs.currentdir()
arg[i] = cwd..(not WIN32 and '/' or '\\')..arg[i]
end
io.open_file(arg[i])
no_args = false
end
i = i + 1
end
if no_args then events.emit(events.ARG_NONE) end
end
-- Shows all registered command line switches on the command line.
local function show_help()
print('Usage: textadept [args] [filenames]')
local line = " %s [%d args]: %s"
for k, v in pairs(switches) do print(line:format(k, table.unpack(v, 2))) end
os.exit()
end
if not CURSES then M.register('-h', '--help', 0, show_help, 'Shows this') end
-- For Windows, create arg table from single command line string (arg[0]).
if WIN32 and not CURSES and #arg[0] > 0 then
local P, C = lpeg.P, lpeg.C
local param = P('"') * C((1 - P('"'))^0) * '"' + C((1 - P(' '))^1)
local params = lpeg.match(lpeg.Ct(param * (P(' ')^1 * param)^0), arg[0])
for i = 1, #params do arg[#arg + 1] = params[i] end
end
-- Set `_G._USERHOME`.
local userhome = os.getenv(not WIN32 and 'HOME' or 'USERPROFILE')..'/.textadept'
for i = 1, #arg do
if (arg[i] == '-u' or arg[i] == '--userhome') and arg[i + 1] then
userhome = arg[i + 1]
break
end
end
if not lfs.attributes(userhome) then lfs.mkdir(userhome) end
local f = io.open(userhome..'/init.lua', 'a+') -- ensure existence
if f then f:close() end
_G._USERHOME = userhome
M.register('-u', '--userhome', 1, function() end, 'Sets alternate _USERHOME')
M.register('-f', '--force', 0, function() end, 'Forces unique instance')
events.connect(events.INITIALIZED,
function() if arg then M.process(arg) end end)
return M
|
