HGKeeper

// Convey

// 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.

// 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.

// You should have received a copy of the GNU General Public License

// along with this program. If not, see <http://www.gnu.org/licenses/>.

// Package color is a simple api for picking colors for display purposes.

package color

import (

"hash/fnv"

"sync"

)

var (

lock sync.Mutex

)

func lookup(identifier string, colorList []string, colorMap map[string]string) string {

lock.Lock()

defer lock.Unlock()

if color, found := colorMap[identifier]; found {

return color

}

h := fnv.New32a()

_, err := h.Write([]byte(identifier))

if err != nil {

panic(err)

}

c := int(h.Sum32() % uint32(len(colorList)))

colorMap[identifier] = colorList[c]

return colorMap[identifier]

}