viye/internal/viye/viye.go (view raw)
| 1 | package viye |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os" |
| 8 | "strings" |
| 9 | "time" |
| 10 | ) |
| 11 | |
| 12 | const ( |
| 13 | Version = "0.0.1-alpha" |
| 14 | Timeout = 5 * time.Second |
| 15 | ) |
| 16 | |
| 17 | var ( |
| 18 | ErrToolNotFound = errors.New("tool not found") |
| 19 | ErrTimeout = fmt.Errorf("timeout: command exceeded %s", Timeout) |
| 20 | ) |
| 21 | |
| 22 | type Context struct { |
| 23 | Dir string // working directory |
| 24 | Path []string // ancestor chain [root, ..., target] |
| 25 | Cmd string |
| 26 | Args []string |
| 27 | Body []string // body lines, ": " prefix stripped |
| 28 | |
| 29 | dispatch func(*Context) (string, error) // set by [Viye.dispatch] for tool chaining |
| 30 | } |
| 31 | |
| 32 | // Next continues dispatch with currect [Context] state. |
| 33 | func (c *Context) Next() (string, error) { return c.dispatch(c) } |
| 34 | |
| 35 | type Tool interface { |
| 36 | Name() string |
| 37 | Match(*Context) bool |
| 38 | Execute(*Context) (string, error) |
| 39 | } |
| 40 | |
| 41 | type Viye struct { |
| 42 | tools []Tool |
| 43 | } |
| 44 | |
| 45 | func New() *Viye { return &Viye{} } |
| 46 | |
| 47 | func (v *Viye) Register(tool Tool) { |
| 48 | v.tools = append(v.tools, tool) |
| 49 | } |
| 50 | |
| 51 | func (v *Viye) Run(out io.Writer, args []string) error { |
| 52 | if len(args) <= 1 { |
| 53 | return nil |
| 54 | } |
| 55 | if args[1] == "help" { |
| 56 | fmt.Fprintln(out, "| Available tools:") |
| 57 | for _, tool := range v.tools { |
| 58 | fmt.Fprintf(out, "| %s\n", tool.Name()) |
| 59 | } |
| 60 | return nil |
| 61 | } |
| 62 | if args[1] == "version" { |
| 63 | fmt.Fprint(out, "| viye version: "+Version) |
| 64 | return nil |
| 65 | } |
| 66 | |
| 67 | path, body := splitArgs(args[1:]) |
| 68 | if len(path) == 0 { |
| 69 | os.Exit(0) |
| 70 | } |
| 71 | |
| 72 | res, err := v.dispatch(&Context{ |
| 73 | Path: path, |
| 74 | Dir: mustGetCwd(), |
| 75 | Body: body, |
| 76 | }) |
| 77 | if err != nil { |
| 78 | return err |
| 79 | } |
| 80 | |
| 81 | _, err = fmt.Fprint(out, res) |
| 82 | return err |
| 83 | } |
| 84 | |
| 85 | func (v *Viye) dispatch(ctx *Context) (string, error) { |
| 86 | if len(ctx.Path) == 0 { |
| 87 | return "", nil |
| 88 | } |
| 89 | for i := range ctx.Path { |
| 90 | ctx.Path[i] = expandEnv(ctx.Path[i]) |
| 91 | } |
| 92 | ctx.Cmd, ctx.Args = splitLeaf(ctx.Path) |
| 93 | ctx.dispatch = v.dispatch |
| 94 | for _, tool := range v.tools { |
| 95 | if tool.Match(ctx) { |
| 96 | return tool.Execute(ctx) |
| 97 | } |
| 98 | } |
| 99 | return "", ErrToolNotFound |
| 100 | } |
| 101 | |
| 102 | func expandEnv(s string) string { |
| 103 | if s == "$$" { |
| 104 | return s |
| 105 | } |
| 106 | return os.ExpandEnv(s) |
| 107 | } |
| 108 | |
| 109 | // splitLeaf splits a path into command name and args. |
| 110 | // ["get", "http://site.com"] → ("get", ["http://site.com"]). |
| 111 | func splitLeaf(path []string) (cmd string, args []string) { |
| 112 | if len(path) == 0 { |
| 113 | return "", nil |
| 114 | } |
| 115 | return path[0], path[1:] |
| 116 | } |
| 117 | |
| 118 | func splitArgs(args []string) (path []string, body []string) { |
| 119 | sawSep := false |
| 120 | for _, arg := range args { |
| 121 | if !sawSep && arg == "--" { |
| 122 | sawSep = true |
| 123 | continue |
| 124 | } |
| 125 | if !sawSep { |
| 126 | path = append(path, arg) |
| 127 | } else { |
| 128 | body = append(body, strings.TrimPrefix(arg, ": ")) |
| 129 | } |
| 130 | } |
| 131 | return |
| 132 | } |
| 133 | |
| 134 | func mustGetCwd() string { |
| 135 | dir, err := os.Getwd() |
| 136 | if err != nil { |
| 137 | panic(fmt.Sprintf("failed to get cwd: %v", err)) |
| 138 | } |
| 139 | return dir |
| 140 | } |