Relicensed under MIT.

flagger.go

@@ -1,28 +1,33 @@
 // Flagger - arbitrary CLI flags parser.
 //
-// Copyright (c) 2017, Stanislav N. aka pztrn.
-// All rights reserved.
+// Copyright (c) 2017-2018, Stanislav N. aka pztrn.
 //
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject
+// to the following conditions:
 //
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
 //
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 package flagger
 
 import (
-    // stdlib
-    "errors"
-    "flag"
-    "sync"
+	// stdlib
+	"errors"
+	"flag"
+	"sync"
 )
 
 // Flagger implements (kinda) extended CLI parameters parser. As it
@@ -32,90 +37,90 @@ import (
 // It uses reflection to determine what kind of variable we should
 // parse or get.
 type Flagger struct {
-    // Flags that was added by user.
-    flags map[string]*Flag
-    flagsMutex sync.Mutex
+	// Flags that was added by user.
+	flags      map[string]*Flag
+	flagsMutex sync.Mutex
 
-    // Flags that will be passed to flag module.
-    flagsBool map[string]*bool
-    flagsInt map[string]*int
-    flagsString map[string]*string
+	// Flags that will be passed to flag module.
+	flagsBool   map[string]*bool
+	flagsInt    map[string]*int
+	flagsString map[string]*string
 }
 
 // Adds flag to list of flags we will pass to ``flag`` package.
 func (f *Flagger) AddFlag(flag *Flag) error {
-    _, present := f.flags[flag.Name]
-    if present {
-        logger.Fatalln("Cannot add flag '" + flag.Name + "' - already added!")
-        return errors.New("Cannot add flag '" + flag.Name + "' - already added!")
-    }
+	_, present := f.flags[flag.Name]
+	if present {
+		logger.Fatalln("Cannot add flag '" + flag.Name + "' - already added!")
+		return errors.New("Cannot add flag '" + flag.Name + "' - already added!")
+	}
 
-    f.flags[flag.Name] = flag
-    return nil
+	f.flags[flag.Name] = flag
+	return nil
 }
 
 // This function returns boolean value for flag with given name.
 // Returns bool value for flag and nil as error on success
 // and false bool plus error with text on error.
 func (f *Flagger) GetBoolValue(name string) (bool, error) {
-    fl, present := f.flagsBool[name]
-    if !present {
-        return false, errors.New("No such flag: " + name)
-    }
-    return (*fl), nil
+	fl, present := f.flagsBool[name]
+	if !present {
+		return false, errors.New("No such flag: " + name)
+	}
+	return (*fl), nil
 }
 
 // This function returns integer value for flag with given name.
 // Returns integer on success and 0 on error.
 func (f *Flagger) GetIntValue(name string) (int, error) {
-    fl, present := f.flagsInt[name]
-    if !present {
-        return 0, errors.New("No such flag: " + name)
-    }
-    return (*fl), nil
+	fl, present := f.flagsInt[name]
+	if !present {
+		return 0, errors.New("No such flag: " + name)
+	}
+	return (*fl), nil
 }
 
 // This function returns string value for flag with given name.
 // Returns string on success or empty string on error.
 func (f *Flagger) GetStringValue(name string) (string, error) {
-    fl, present := f.flagsString[name]
-    if !present {
-        return "", errors.New("No such flag: " + name)
-    }
-    return (*fl), nil
+	fl, present := f.flagsString[name]
+	if !present {
+		return "", errors.New("No such flag: " + name)
+	}
+	return (*fl), nil
 }
 
 // Flagger initialization.
 func (f *Flagger) Initialize() {
-    logger.Println("Initializing CLI parameters parser...")
+	logger.Println("Initializing CLI parameters parser...")
 
-    f.flags = make(map[string]*Flag)
+	f.flags = make(map[string]*Flag)
 
-    f.flagsBool = make(map[string]*bool)
-    f.flagsInt = make(map[string]*int)
-    f.flagsString = make(map[string]*string)
+	f.flagsBool = make(map[string]*bool)
+	f.flagsInt = make(map[string]*int)
+	f.flagsString = make(map[string]*string)
 }
 
 // This function adds flags from flags map to flag package and parse
 // them. They can be obtained later by calling GetTYPEValue(name),
 // where TYPE is one of Bool, Int, String.
 func (f *Flagger) Parse() {
-    for name, fl := range f.flags {
-        if fl.Type == "bool" {
-            fdef := fl.DefaultValue.(bool)
-            f.flagsBool[name] = &fdef
-            flag.BoolVar(&fdef, name, fdef, fl.Description)
-        } else if fl.Type == "int" {
-            fdef := fl.DefaultValue.(int)
-            f.flagsInt[name] = &fdef
-            flag.IntVar(&fdef, name, fdef, fl.Description)
-        } else if fl.Type == "string" {
-            fdef := fl.DefaultValue.(string)
-            f.flagsString[name] = &fdef
-            flag.StringVar(&fdef, name, fdef, fl.Description)
-        }
-    }
+	for name, fl := range f.flags {
+		if fl.Type == "bool" {
+			fdef := fl.DefaultValue.(bool)
+			f.flagsBool[name] = &fdef
+			flag.BoolVar(&fdef, name, fdef, fl.Description)
+		} else if fl.Type == "int" {
+			fdef := fl.DefaultValue.(int)
+			f.flagsInt[name] = &fdef
+			flag.IntVar(&fdef, name, fdef, fl.Description)
+		} else if fl.Type == "string" {
+			fdef := fl.DefaultValue.(string)
+			f.flagsString[name] = &fdef
+			flag.StringVar(&fdef, name, fdef, fl.Description)
+		}
+	}
 
-    logger.Println("Parsing CLI parameters...")
-    flag.Parse()
+	logger.Println("Parsing CLI parameters...")
+	flag.Parse()
 }