/
list.go
99 lines (78 loc) · 1.59 KB
/
list.go
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package main
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"sort"
)
func listAll(ctx context.Context, url string) ([]version, error) {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return nil, err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
var tree struct {
Entries []struct {
Path string `json:"path"`
Type string `json:"type"`
} `json:"tree"`
Truncated bool `json:"truncated"`
}
if err = json.NewDecoder(resp.Body).Decode(&tree); err != nil {
return nil, fmt.Errorf("list: %w", err)
}
var vers versions
for _, entry := range tree.Entries {
if entry.Type != "tree" {
continue
}
if entry.Path[:2] != "go" {
continue
}
var ver version
ver, err = parse(entry.Path)
if err != nil {
return nil, err
}
vers = append(vers, ver)
}
return vers, nil
}
func list(ctx context.Context, stdout io.Writer, filter string) error {
var (
min version
vers versions
err error
)
switch filter {
case "latest":
vers, err = latest(ctx, "https://go.dev")
default:
if filter != "" {
min, err = parse(filter)
if err != nil {
return err
}
}
vers, err = listAll(ctx, "https://api.github.com/repos/golang/dl/git/trees/master")
}
if err != nil {
return err
}
sort.Sort(sort.Reverse(vers))
for _, ver := range vers {
if ver.Minor != min.Minor && min != (version{}) {
continue
}
fmt.Fprintln(stdout, ver)
}
return nil
}
func listRun(ctx context.Context, stdout, _ io.Writer, filter string) error {
return list(ctx, stdout, filter)
}