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main.go
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main.go
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package main
// Import ...
import (
"flag"
"log"
"os"
"github.com/blampe/goat"
)
// Function init ...
func init() {
log.SetFlags(/*log.Ldate |*/ log.Ltime | log.Lshortfile)
}
func main() {
var (
inputFilename,
outputFilename,
svgColorLightScheme,
svgColorDarkScheme string
)
flag.StringVar(&inputFilename, "i", "", "Input filename (default stdin)")
flag.StringVar(&outputFilename, "o", "", "Output filename (default stdout for SVG)")
flag.StringVar(&svgColorLightScheme, "sls", "#000000", `short for -svg-color-light-scheme`)
flag.StringVar(&svgColorLightScheme, "svg-color-light-scheme", "#000000",
`See help for -svg-color-dark-scheme`)
flag.StringVar(&svgColorDarkScheme, "sds", "#FFFFFF", `short for -svg-color-dark-scheme`)
flag.StringVar(&svgColorDarkScheme, "svg-color-dark-scheme", "#FFFFFF",
`Goat's SVG output attempts to learn something about the background being
drawn on top of by means of a CSS @media query, which returns a string.
If the string is "dark", Goat draws with the color specified by
this option; otherwise, Goat draws with the color specified by option
-svg-color-light-scheme.
See https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme
`)
flag.Parse()
input := os.Stdin
if inputFilename != "" {
if _, err := os.Stat(inputFilename); os.IsNotExist(err) {
log.Fatalf("input file not found: %s", inputFilename)
}
var err error
input, err = os.Open(inputFilename)
defer input.Close()
if err != nil {
log.Fatal(err)
}
}
output := os.Stdout
if outputFilename != "" {
var err error
output, err = os.Create(outputFilename)
defer output.Close() // XX Move outside 'if' -- close os.Stdout as well?
if err != nil {
log.Fatal(err)
}
}
goat.BuildAndWriteSVG(input, output,
svgColorLightScheme, svgColorDarkScheme)
}