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/*
Copyright (C) 2019 Leo Tenenbaum
This file is part of AutoArt.
AutoArt 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.
AutoArt 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 AutoArt. If not, see <https://www.gnu.org/licenses/>.
*/
package main
// Some functions for dealing with user input
import (
"bufio"
"fmt"
"github.com/pommicket/autoart/autoart"
"strconv"
"strings"
)
// Reads an int64 from a buffered reader, after giving the user the given prompt
// If the number that the user entered does not satisfy valid, the user will
// be prompted again. If the user enters nothing, the default will be used.
func readInt64(reader *bufio.Reader, prompt string,
valid func(int64) bool, def int64) (int64, error) {
fmt.Print(prompt)
for {
line, err := reader.ReadString('\n')
if err != nil {
return 0, err
}
line = strings.TrimSpace(line)
if line == "" {
return def, nil
}
num, err := strconv.ParseInt(line, 0, 64)
if err != nil {
fmt.Println("Please enter a number.")
fmt.Print(prompt)
continue
}
if !valid(num) {
fmt.Println("Please enter a valid option.")
fmt.Print(prompt)
continue
}
return num, nil
}
}
// Reads a bool from the reader, prompting the user until they enter y/n.
func readBool(reader *bufio.Reader, prompt string, def bool) (bool, error) {
for {
fmt.Print(prompt)
line, err := reader.ReadString('\n')
if err != nil {
return false, err
}
line = strings.ToLower(strings.TrimSpace(line))
if line == "" {
return def, nil
}
switch line[0] {
case 'y':
return true, nil
case 'n':
return false, nil
}
fmt.Println("Please enter yes or no.")
}
}
// Reads an autoart.Config
func readConf(reader *bufio.Reader, conf *autoart.Config) error {
positive := func(i int64) bool { return i > 0 }
functionLength, err := readInt64(reader, "Function length (default: 40)? ", positive, 40)
if err != nil {
return err
}
colorSpace, err := readInt64(reader, `Which color space should be used?
1. RGB
2. Grayscale
3. CMYK
4. HSV
5. YCbCr
Please enter a number between 1 and 5 (default: 1): `, func(i int64) bool {
return i >= 1 && i <= 5
}, 1)
if err != nil {
return err
}
alpha, err := readBool(reader, "Should an alpha channel be included (yes/no, default: no)? ", false)
if err != nil {
return err
}
rectifier, err := readInt64(reader, `How should out of range values be dealt with?
1. Modulo
2. Clamp
3. Sigmoid
Please enter 1, 2, or 3 (default: 1): `, func(i int64) bool {
return i >= 1 && i <= 3
}, 1)
if err != nil {
return err
}
coords, err := readInt64(reader, `Which coordinate system should be used?
1. x, y
2. r, theta
Please enter 1 or 2 (default: 1): `, func(i int64) bool {
return i >= 1 && i <= 2
}, 1)
if err != nil {
return err
}
conf.FunctionLength = int(functionLength)
conf.ColorSpace = int(colorSpace - 1)
conf.Alpha = alpha
conf.Rectifier = int(rectifier - 1)
conf.CoordinateSys = int(coords - 1)
return nil
}
func readPaletteConf(reader *bufio.Reader, conf *autoart.PaletteConfig) error {
positive := func(i int64) bool { return i > 0 }
ncolors, err := readInt64(reader, "How many colors do you want (default: 10)? ", positive, 10)
if err != nil {
return err
}
alpha, err := readBool(reader, "Should an alpha channel be included (yes/no, default: no)? ", false)
if err != nil {
return err
}
functionLength, err := readInt64(reader, "Function length (default: 40)? ", positive, 40)
if err != nil {
return err
}
coords, err := readInt64(reader, `Which coordinate system should be used?
1. x, y
2. r, theta
Please enter 1 or 2 (default: 1): `, func(i int64) bool {
return i >= 1 && i <= 2
}, 1)
if err != nil {
return err
}
conf.NColors = int(ncolors)
conf.Alpha = alpha
conf.FunctionLength = int(functionLength)
conf.CoordinateSys = int(coords - 1)
return nil
}
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