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

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()

h.Write([]byte(identifier))

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

colorMap[identifier] = colorList[c]

return colorMap[identifier]

}