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On 7/15/2016 1:57 PM, Dirk Laurie wrote:
It took some time to read them all. .... I could find argparse, optparse and pl.lapp..... lapp is a table with several fields, one of which looks promising. ....help(lapp)Contents: add_type assert callback error open process_options_string quit show_usage_errorhelp(lapp.process_options_string)--- process a Lapp options string. -- Usually called as `lapp()`. -- @string str the options text -- @tparam {string} args a table of arguments (default is `_G.arg`) -- @return a table with parameter-value pairs OK, this one is on the shortlist. I may need to read its docs after all, in which case the others come back into contention.
Even better, it has metatable that provides __call(). You can use the additional methods it supplies if you need to extend it or fine tune its behavior.
Most of my casual utility scripts quickly get something like this at the top:
local lapp = require 'pl.lapp'
local args = lapp[[
Process something and fill a folder full of output files.
--boxes Show layout boxes layer
--dpi (default 300) DPI for scaling
-o,--outputfolder (default output)
Output folder
--png Output PNG not PDF
Some additional options you shouldn't need:
-v Be more verbose
--debug Dump internal data structures
]]
The __call() parses the single string argument along with the global
variable _G.arg to learn what options are allowed and which are present.
The table it returns has fields named after the long name of every
option. It supports easy things like boolean flags and default values
with rather natural syntax in the Usage text. It can do more fancy
things with some effort.
-- Ross Berteig Ross@CheshireEng.com Cheshire Engineering Corp. http://www.CheshireEng.com/ +1 626 303 1602