Added mutually exclusive groups

rockspecs/argparse-git-1.rockspec

@@ -11,7 +11,7 @@ description = {
 }
 dependencies = {
    "lua >= 5.1, < 5.3",
-   "30log >= 0.8"
+   "30log >= 0.9.1"
 }
 build = {
    type = "builtin",

spec/mutex_spec.lua

@@ -0,0 +1,67 @@
+local Parser = require "argparse"
+
+describe("tests related to mutexes", function()
+   it("handles mutex correctly", function()
+      local parser = Parser()
+      parser:mutex(
+         parser:flag "-q" "--quiet"
+            :description "Supress logging. ",
+         parser:flag "-v" "--verbose"
+            :description "Print additional debug information. "
+      )
+
+      local args = parser:parse{"-q"}
+      assert.same({quiet = true}, args)
+      args = parser:parse{"-v"}
+      assert.same({verbose = true}, args)
+      args = parser:parse{}
+      assert.same({}, args)
+   end)
+
+   it("raises an error if mutex is broken", function()
+      local parser = Parser()
+      parser:mutex(
+         parser:flag "-q" "--quiet"
+            :description "Supress logging. ",
+         parser:flag "-v" "--verbose"
+            :description "Print additional debug information. "
+      )
+
+      assert.has_error(function() parser:parse{"-qv"} end, "option '-v' can not be used together with option '-q'")
+      assert.has_error(function() parser:parse{"-v", "--quiet"} end, "option '--quiet' can not be used together with option '-v'")
+   end)
+
+   it("handles multiple mutexes", function()
+      local parser = Parser()
+      parser:mutex(
+         parser:flag "-q" "--quiet",
+         parser:flag "-v" "--verbose"
+      )
+      parser:mutex(
+         parser:flag "-l" "--local",
+         parser:option "-f" "--from"
+      )
+
+      local args = parser:parse{"-qq", "-fTHERE"}
+      assert.same({quiet = true, from = "THERE"}, args)
+      args = parser:parse{"-vl"}
+      assert.same({verbose = true, ["local"] = true}, args)
+   end)
+
+   it("handles mutexes in commands", function()
+      local parser = Parser()
+      parser:mutex(
+         parser:flag "-q" "--quiet",
+         parser:flag "-v" "--verbose"
+      )
+      local install = parser:command "install"
+      install:mutex(
+         install:flag "-l" "--local",
+         install:option "-f" "--from"
+      )
+
+      local args = parser:parse{"install", "-l"}
+      assert.same({install = true, ["local"] = true}, args)
+      assert.has_error(function() parser:parse{"install", "-qlv"} end, "option '-v' can not be used together with option '-q'")
+   end)
+end)

spec/usage_spec.lua

@@ -158,4 +158,25 @@ describe("tests related to usage message generation", function()
          )
       end)
    end)
+
+   it("creates correct usage message for mutexes", function()
+      local parser = Parser "foo"
+         :add_help(false)
+      parser:mutex(
+         parser:flag "-q" "--quiet",
+         parser:flag "-v" "--verbose",
+         parser:flag "-i" "--interactive"
+      )
+      parser:mutex(
+         parser:flag "-l" "--local",
+         parser:option "-f" "--from"
+      )
+      parser:option "--yet-another-option"
+
+      assert.equal(table.concat({
+         "Usage: foo ([-q] | [-v] | [-i]) ([-l] | [-f <from>])",
+         "       [--yet-another-option <yet-another-option>]"
+         }, "\r\n"), parser:get_usage()
+      )
+   end)
 end)

src/argparse.lua

@@ -157,6 +157,7 @@ do -- Create classes with setters
       _arguments = {},
       _options = {},
       _commands = {},
+      _mutexes = {},
       _require_command = true
    }, {
       name = typecheck.string "name",
@@ -424,6 +425,17 @@ function Parser:command(...)
    return command
 end
 
+function Parser:mutex(...)
+   local options = {...}
+
+   for i, option in ipairs(options) do
+      assert(getmetatable(option) == Option, ("bad argument #%d to 'mutex' (Option expected)"):format(i))
+   end
+
+   table.insert(self._mutexes, options)
+   return self
+end
+
 local max_usage_width = 70
 local usage_welcome = "Usage: "
 
@@ -442,9 +454,25 @@ function Parser:get_usage()
       end
    end
 
+   -- set of mentioned elements
+   local used = {}
+
+   for _, mutex in ipairs(self._mutexes) do
+      local buf = {}
+
+      for _, option in ipairs(mutex) do
+         table.insert(buf, option:_get_usage())
+         used[option] = true
+      end
+
+      add("(" .. table.concat(buf, " | ") .. ")")
+   end
+
    for _, elements in ipairs{self._options, self._arguments} do
       for _, element in ipairs(elements) do
-         add(element:_get_usage())
+         if not used[element] then
+            add(element:_get_usage())
+         end
       end
    end
 
@@ -583,6 +611,8 @@ function Parser:_parse(args, errhandler)
    local options = {}
    local arguments = {}
    local commands
+   local option_mutexes = {}
+   local used_mutexes = {}
    local opt_context = {}
    local com_context
    local result = {}
@@ -726,6 +756,16 @@ function Parser:_parse(args, errhandler)
          invocations[option] = 0
       end
 
+      for _, mutex in ipairs(parser._mutexes) do
+         for _, option in ipairs(mutex) do
+            if not option_mutexes[option] then
+               option_mutexes[option] = {mutex}
+            else
+               table.insert(option_mutexes[option], mutex)
+            end
+         end
+      end
+
       for _, argument in ipairs(parser._arguments) do
          table.insert(arguments, argument)
          invocations[argument] = 0
@@ -784,6 +824,17 @@ function Parser:_parse(args, errhandler)
       end
 
       cur_option = opt_context[data]
+
+      if option_mutexes[cur_option] then
+         for _, mutex in ipairs(option_mutexes[cur_option]) do
+            if used_mutexes[mutex] and used_mutexes[mutex] ~= cur_option then
+               error_("option '%s' can not be used together with option '%s'", data, used_mutexes[mutex]._name)
+            else
+               used_mutexes[mutex] = cur_option
+            end
+         end
+      end
+
       do_action(cur_option)
       invoke(cur_option)
    end