80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
// gomuks - A terminal Matrix client written in Go.
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// Copyright (C) 2018 Tulir Asokan
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package widget
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import (
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"fmt"
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"hash/fnv"
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"sort"
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"github.com/gdamore/tcell"
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)
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var colorNames []string
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// init initializes the colorNames array.
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func init() {
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colorNames = make([]string, len(tcell.ColorNames))
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i := 0
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for name, _ := range tcell.ColorNames {
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colorNames[i] = name
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i++
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}
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// In order to have consistent coloring between restarts, we need to sort the array.
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sort.Sort(sort.StringSlice(colorNames))
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}
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// GetHashColorName gets a color name for the given string based on its FNV-1 hash.
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//
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// The array of possible color names are the alphabetically ordered color
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// names specified in tcell.ColorNames.
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//
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// The algorithm to get the color is as follows:
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// colorNames[ FNV1(string) % len(colorNames) ]
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//
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// With the exception of the three special cases:
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// --> = green
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// <-- = red
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// --- = yellow
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func GetHashColorName(s string) string {
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switch s {
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case "-->":
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return "green"
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case "<--":
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return "red"
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case "---":
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return "yellow"
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default:
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h := fnv.New32a()
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h.Write([]byte(s))
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return colorNames[int(h.Sum32())%len(colorNames)]
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}
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}
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// GetHashColor gets the tcell Color value for the given string.
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//
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// GetHashColor calls GetHashColorName() and gets the Color value from the tcell.ColorNames map.
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func GetHashColor(s string) tcell.Color {
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return tcell.ColorNames[GetHashColorName(s)]
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}
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// AddHashColor adds tview color tags to the given string.
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// The color added is the color returned by GetHashColorName().
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func AddHashColor(s string) string {
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return fmt.Sprintf("[%s]%s[white]", GetHashColorName(s), s)
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}
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