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package main
import (
"fmt"
"os"
"os/exec"
"strings"
"time"
"github.com/urfave/cli/v2"
)
func main() {
sources := Sources{}
(&cli.App{
Name: "yae",
Usage: "Nix Dependency Manager",
Description: "Nix Dependency Manager",
EnableBashCompletion: true,
Authors: []*cli.Author{
{
Name: "Fuwn",
Email: "[email protected]",
},
},
Before: func(c *cli.Context) error {
return sources.Load(c.String("sources"))
},
Flags: []cli.Flag{
&cli.StringFlag{
Name: "sources",
Value: "./yae.json",
Usage: "Sources path",
},
},
Copyright: fmt.Sprintf("Copyright (c) 2024-%s Fuwn", fmt.Sprint(time.Now().Year())),
ExitErrHandler: func(c *cli.Context, err error) {
if err != nil {
fmt.Println(err)
}
},
Suggest: true,
Commands: []*cli.Command{
{
Name: "add",
Args: true,
ArgsUsage: "<name> <uri>",
Usage: "Add a source",
Flags: []cli.Flag{
&cli.BoolFlag{
Name: "unpack",
Usage: "Unpack the source into the Nix Store",
},
},
Action: func(c *cli.Context) error {
if c.Args().Len() != 2 {
return fmt.Errorf("invalid number of arguments")
}
if sources.Exists(c.Args().Get(0)) {
return fmt.Errorf("source already exists")
}
sha256, err := fetchSHA256(c.Args().Get(1), c.Bool("unpack"))
if err != nil {
return err
}
if err = sources.Add(c.Args().Get(0), Source{
URI: c.Args().Get(1),
SHA256: sha256,
Unpack: c.Bool("unpack"),
}); err != nil {
return err
}
return sources.Save(c.String("sources"))
},
},
{
Name: "drop",
Args: true,
Usage: "Drop a source",
Action: func(c *cli.Context) error {
if c.Args().Len() == 0 {
return fmt.Errorf("invalid number of arguments")
}
if !sources.Exists(c.Args().Get(0)) {
return fmt.Errorf("source does not exist")
}
sources.Drop(c.Args().Get(0))
return sources.Save(c.String("sources"))
},
},
{
Name: "update",
Args: true,
Usage: "Update one or all sources",
ArgsUsage: "[name]",
Flags: []cli.Flag{
&cli.BoolFlag{
Name: "unpack",
Usage: "Unpack the source into the Nix Store",
},
},
Action: func(c *cli.Context) error {
if c.Args().Len() == 0 {
for key, value := range sources {
sha256, err := fetchSHA256(value.URI, value.Unpack)
if err != nil {
return err
}
if sha256 != value.SHA256 {
sources[key] = Source{
URI: value.URI,
SHA256: sha256,
Unpack: value.Unpack,
}
fmt.Println("updated hash for", key)
}
if err = sources.Save(c.String("sources")); err != nil {
return err
}
}
} else {
if !sources.Exists(c.Args().Get(0)) {
return fmt.Errorf("source does not exist")
}
sha256, err := fetchSHA256(sources[c.Args().Get(0)].URI, c.Bool("unpack"))
if err != nil {
return err
}
sources[c.Args().Get(0)] = Source{
URI: sources[c.Args().Get(0)].URI,
SHA256: sha256,
Unpack: c.Bool("unpack"),
}
if err = sources.Save(c.String("sources")); err != nil {
return err
}
}
return nil
},
},
},
}).Run(os.Args)
}
func fetchSHA256(uri string, unpack bool) (string, error) {
arguments := []string{"--type", "sha256", uri}
if unpack {
arguments = append([]string{"--unpack"}, arguments...)
}
output, err := commandOutput("nix-prefetch-url", arguments...)
if err != nil {
return "", err
}
lines := strings.Split(output, "\n")
return strings.Trim(lines[len(lines)-2], "\n"), nil
}
func commandOutput(name string, args ...string) (string, error) {
executable, err := exec.LookPath(name)
cmd := exec.Command(executable, args...)
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
out, err := cmd.Output()
return string(out), err
}
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