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annotate utils/optparse.lua @ 124:f740026b1518

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add initiator support in delegation

if a delegation is issued from the initiative view, the initiators
from that one are added to the delegation target list. this makes it easier to delegate to the author without the need to add him to the contact list.
author Daniel Poelzleithner <poelzi@poelzi.org>
date Mon Sep 20 20:32:04 2010 +0200 (2010-09-20)
parents eeb167cf9dc4
children
rev   line source
poelzi@107 1 -- Lua command line option parser.
poelzi@107 2 -- Interface based on Pythons optparse.
poelzi@107 3 -- http://docs.python.org/lib/module-optparse.html
poelzi@107 4 -- (c) 2008 David Manura, Licensed under the same terms as Lua (MIT license)
poelzi@107 5 --
poelzi@107 6 -- To be used like this:
poelzi@107 7 -- t={usage="<some usage message>", version="<version string>"}
poelzi@107 8 -- op=OptionParser(t)
poelzi@107 9 -- op=add_option{"<opt>", action=<action>, dest=<dest>, help="<help message for this option>"}
poelzi@107 10 --
poelzi@107 11 -- with :
poelzi@107 12 -- <opt> the option string to be used (can be anything, if one letter opt, then should be -x val, more letters: -xy=val )
poelzi@107 13 -- <action> one of
poelzi@107 14 -- - store: store in options as key, val
poelzi@107 15 -- - store_true: stores key, true
poelzi@107 16 -- - store_false: stores key, false
poelzi@107 17 -- <dest> is the key under which the option is saved
poelzi@107 18 --
poelzi@107 19 -- options,args = op.parse_args()
poelzi@107 20 --
poelzi@107 21 -- now options is the table of options (key, val) and args is the table with non-option arguments.
poelzi@107 22 -- You can use op.fail(message) for failing and op.print_help() for printing the usage as you like.
poelzi@107 23
poelzi@107 24 --module('utils.optparse')
poelzi@107 25
poelzi@107 26 local function OptionParser(t)
poelzi@107 27 local usage = t.usage
poelzi@107 28 local version = t.version
poelzi@107 29 local commands = t.commands
poelzi@107 30
poelzi@107 31 local o = {}
poelzi@107 32 local option_descriptions = {}
poelzi@107 33 local option_of = {}
poelzi@107 34
poelzi@107 35 function o.fail(s) -- extension
poelzi@107 36 io.stderr:write(s .. '\n')
poelzi@107 37 os.exit(1)
poelzi@107 38 end
poelzi@107 39
poelzi@107 40 function o.add_option(optdesc)
poelzi@107 41 option_descriptions[#option_descriptions+1] = optdesc
poelzi@107 42 for _,v in pairs(optdesc) do
poelzi@107 43 option_of[v] = optdesc
poelzi@107 44 end
poelzi@107 45 end
poelzi@107 46 function o.parse_args()
poelzi@107 47 -- expand options (e.g. "--input=file" -> "--input", "file")
poelzi@107 48 local arg = {unpack(arg)}
poelzi@107 49 for i=#arg,1,-1 do local v = arg[i]
poelzi@107 50 local flag, val = v:match('^(%-%-%w+)=(.*)')
poelzi@107 51 if flag then
poelzi@107 52 arg[i] = flag
poelzi@107 53 table.insert(arg, i+1, val)
poelzi@107 54 end
poelzi@107 55 end
poelzi@107 56
poelzi@107 57 local options = {}
poelzi@107 58 for _,optdesc in ipairs(option_descriptions) do
poelzi@107 59 options[optdesc["dest"]] = optdesc.default
poelzi@107 60 end
poelzi@107 61 local args = {}
poelzi@107 62 local i = 1
poelzi@107 63 while i <= #arg do local v = arg[i]
poelzi@107 64 local optdesc = option_of[v]
poelzi@107 65 if optdesc then
poelzi@107 66 local action = optdesc.action
poelzi@107 67 local val
poelzi@107 68 if action == 'store' or action == nil then
poelzi@107 69 i = i + 1
poelzi@107 70 val = arg[i]
poelzi@107 71 if not val then o.fail('option requires an argument ' .. v) end
poelzi@107 72 elseif action == 'store_true' then
poelzi@107 73 val = true
poelzi@107 74 elseif action == 'store_false' then
poelzi@107 75 val = false
poelzi@107 76 end
poelzi@107 77 options[optdesc.dest] = val
poelzi@107 78 else
poelzi@107 79 if v:match('^%-') then o.fail('invalid option ' .. v) end
poelzi@107 80 args[#args+1] = v
poelzi@107 81 end
poelzi@107 82 i = i + 1
poelzi@107 83 end
poelzi@107 84 if options.help then
poelzi@107 85 o.print_help()
poelzi@107 86 os.exit()
poelzi@107 87 end
poelzi@107 88 if options.version then
poelzi@107 89 io.stdout:write(t.version .. "\n")
poelzi@107 90 os.exit()
poelzi@107 91 end
poelzi@107 92 return options, args
poelzi@107 93 end
poelzi@107 94
poelzi@107 95 local function flags_str(optdesc)
poelzi@107 96 local sflags = {}
poelzi@107 97 local action = optdesc.action
poelzi@107 98 for _,flag in ipairs(optdesc) do
poelzi@107 99 local sflagend
poelzi@107 100 if action == nil or action == 'store' then
poelzi@107 101 local metavar = optdesc.metavar or optdesc.dest:upper()
poelzi@107 102 sflagend = #flag == 2 and ' ' .. metavar
poelzi@107 103 or '=' .. metavar
poelzi@107 104 else
poelzi@107 105 sflagend = ''
poelzi@107 106 end
poelzi@107 107 sflags[#sflags+1] = flag .. sflagend
poelzi@107 108 end
poelzi@107 109 return table.concat(sflags, ', ')
poelzi@107 110 end
poelzi@107 111
poelzi@107 112 function o.print_help()
poelzi@107 113 io.stdout:write("Usage: " .. usage:gsub('%%prog', arg[0]) .. "\n")
poelzi@107 114 io.stdout:write("\n")
poelzi@107 115 io.stdout:write("Options:\n")
poelzi@107 116 for _,optdesc in ipairs(option_descriptions) do
poelzi@107 117 io.stdout:write(" " .. flags_str(optdesc) ..
poelzi@107 118 " " .. optdesc.help .. "\n")
poelzi@107 119 end
poelzi@107 120 if commands then
poelzi@107 121 io.stdout:write("\nCommands:\n")
poelzi@107 122 for _,command in ipairs(commands) do
poelzi@107 123 io.stdout:write(" " .. command[1] ..
poelzi@107 124 string.rep(" ", 30-#command[1]) ..
poelzi@107 125 command[2] .. "\n")
poelzi@107 126 end
poelzi@107 127 end
poelzi@107 128
poelzi@107 129 end
poelzi@107 130 o.add_option{"--help", action="store_true", dest="help",
poelzi@107 131 help="show this help message and exit"}
poelzi@107 132 if t.version then
poelzi@107 133 o.add_option{"--version", action="store_true", dest="version",
poelzi@107 134 help="output version info."}
poelzi@107 135 end
poelzi@107 136 return o
poelzi@107 137 end
poelzi@107 138
poelzi@107 139 return OptionParser

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