179 lines
3.1 KiB
Go
179 lines
3.1 KiB
Go
// ppppcg is a PrePostPrint inspired political compass generator with SVG output.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"path/filepath"
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svg "github.com/ajstarks/svgo"
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"gopkg.in/yaml.v2"
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)
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// help is the CLI help text.
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const help = `ppppcg [options]
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A PrePostPrint inspired political compass generator with SVG output.
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Options:
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-h output help
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`
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// config is the user configuration file.
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type config struct {
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Width int
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Height int
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Axis struct {
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Top string
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Right string
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Bottom string
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Left string
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}
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Points []struct {
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Name string
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X int
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Y int
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}
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}
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var (
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helpFlag bool
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configFlag string
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// rectMargin is the margin for the compass rectangle.
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rectMargin = 50
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// fillNoneStrokeBlack is a default calm line style.
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fillNoneStrokeBlack = "fill:none;stroke:black"
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// axisFontStyle is the default axis font style
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axisFontStyle = "font-size: 13pt;font-weight:bold"
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// pointFontStyle is the default point font style
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pointFontStyle = "font-size: 11pt;font-style:italic"
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// lineOverflow is the amount of overflow permitted for each compass line.
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lineOverflow = 10
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)
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// handleCliFlags parses CLI flags.
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func handleCliFlags() {
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flag.BoolVar(&helpFlag, "h", false, "output help")
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flag.StringVar(&configFlag, "c", "ppppcg.yml", "config file")
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flag.Parse()
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}
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// loadYAMLConfig loads a mppppcg YAML user config.
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func loadYAMLConfig() (config, error) {
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var cfg config
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configPath, err := filepath.Abs(configFlag)
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if err != nil {
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return config{}, fmt.Errorf("loadYAMLConfig: unable to convert %s to an absolute path: %w", configFlag, err)
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}
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conf, err := os.ReadFile(configPath)
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if err != nil {
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return config{}, fmt.Errorf("loadYAMLConfig: unable to read %s: %w", configFlag, err)
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}
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err = yaml.UnmarshalStrict(conf, &cfg)
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if err != nil {
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return config{}, fmt.Errorf("loadYAMLConfig: unable to unmarshal %s: %w", string(conf), err)
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}
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return cfg, nil
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}
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// main is the CLI entrypoint.
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func main() {
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handleCliFlags()
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if helpFlag {
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fmt.Print(help)
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os.Exit(0)
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}
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cfg, err := loadYAMLConfig()
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if err != nil {
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log.Fatal(err)
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}
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canvas := svg.New(os.Stdout)
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canvas.Start(cfg.Width, cfg.Height)
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canvas.CenterRect(
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cfg.Width/2,
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cfg.Height/2,
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cfg.Width-rectMargin,
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cfg.Width-rectMargin,
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fillNoneStrokeBlack,
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)
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canvas.Line(
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cfg.Width/2,
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lineOverflow,
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cfg.Width/2,
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cfg.Width-lineOverflow,
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fillNoneStrokeBlack,
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)
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canvas.Line(
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lineOverflow,
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cfg.Width/2,
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cfg.Width-lineOverflow,
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cfg.Width/2,
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fillNoneStrokeBlack,
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)
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canvas.TranslateRotate(
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lineOverflow,
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cfg.Width/2,
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270,
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)
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canvas.Text(
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-15,
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35,
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cfg.Axis.Left,
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axisFontStyle,
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)
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canvas.Gend()
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canvas.Text(
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cfg.Width/2+10,
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lineOverflow+10,
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cfg.Axis.Top,
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axisFontStyle,
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)
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canvas.TranslateRotate(
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cfg.Width-lineOverflow,
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(cfg.Width/2)-lineOverflow+5,
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90,
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)
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canvas.Text(
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35,
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-(cfg.Width/2)-3,
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cfg.Axis.Right,
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axisFontStyle,
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)
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canvas.Gend()
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canvas.Text(
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(cfg.Width/2)+lineOverflow,
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cfg.Width-lineOverflow,
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cfg.Axis.Bottom,
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axisFontStyle,
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)
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for _, p := range cfg.Points {
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canvas.Text(p.X, p.Y, p.Name, pointFontStyle)
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}
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canvas.End()
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}
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