viye/internal/viye/viye.go (view raw)
| 1 | package viye |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os" |
| 8 | "strings" |
| 9 | ) |
| 10 | |
| 11 | const Version = "0.0.1-alpha" |
| 12 | |
| 13 | var ErrPlumbingNotFound = errors.New("tool not found") |
| 14 | |
| 15 | type Context struct { |
| 16 | Dir string // working directory |
| 17 | |
| 18 | Cmd string // first word of the leaf path component |
| 19 | Args []string // remaining words of the leaf path component |
| 20 | Path []string // ancestor chain [root, ..., target] |
| 21 | Body []string // body lines from : children (edited data for two-phase execution) |
| 22 | |
| 23 | dispatch func(*Context) (string, error) // set by [Viye.dispatch] for tool chaining |
| 24 | } |
| 25 | |
| 26 | // Next continues dispatch with currect [Context] state. |
| 27 | func (c *Context) Next() (string, error) { return c.dispatch(c) } |
| 28 | |
| 29 | type Tool interface { |
| 30 | Name() string |
| 31 | Match(*Context) bool |
| 32 | Execute(*Context) (string, error) |
| 33 | } |
| 34 | |
| 35 | type Viye struct { |
| 36 | tools []Tool |
| 37 | } |
| 38 | |
| 39 | func New() *Viye { return &Viye{} } |
| 40 | |
| 41 | func (v *Viye) Register(tool Tool) { |
| 42 | v.tools = append(v.tools, tool) |
| 43 | } |
| 44 | |
| 45 | func (v *Viye) Run(out io.Writer, args []string) error { |
| 46 | if len(args) <= 1 { |
| 47 | return nil |
| 48 | } |
| 49 | if args[1] == "help" { |
| 50 | return v.showHelp(out) |
| 51 | } |
| 52 | if args[1] == "version" { |
| 53 | return v.showVersion(out) |
| 54 | } |
| 55 | |
| 56 | path, body := splitArgs(args[1:]) |
| 57 | if len(path) == 0 { |
| 58 | os.Exit(0) |
| 59 | } |
| 60 | |
| 61 | res, err := v.dispatch(&Context{ |
| 62 | Path: path, |
| 63 | Dir: mustGetCwd(), |
| 64 | Body: body, |
| 65 | }) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | |
| 70 | _, err = fmt.Fprint(out, res) |
| 71 | return err |
| 72 | } |
| 73 | |
| 74 | func (v *Viye) showHelp(out io.Writer) error { |
| 75 | fmt.Fprintln(out, "Available tools:") |
| 76 | for _, tool := range v.tools { |
| 77 | fmt.Fprintf(out, "- %s\n", tool.Name()) |
| 78 | } |
| 79 | return nil |
| 80 | } |
| 81 | |
| 82 | func (v *Viye) showVersion(out io.Writer) error { |
| 83 | fmt.Fprint(out, "| viye version: "+Version) |
| 84 | return nil |
| 85 | } |
| 86 | |
| 87 | // dispatch executes the path against registered tools, first-match-wins |
| 88 | func (v *Viye) dispatch(ctx *Context) (string, error) { |
| 89 | if len(ctx.Path) == 0 { |
| 90 | return "", nil |
| 91 | } |
| 92 | ctx.Cmd, ctx.Args = splitLeaf(ctx.Path[len(ctx.Path)-1]) |
| 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 "", ErrPlumbingNotFound |
| 100 | } |
| 101 | |
| 102 | // splitLeaf splits a leaf path component into command name and args. |
| 103 | // For "$ go run ." returns ("$", []string{"go", "run", "."}). |
| 104 | // For "ip" returns ("ip", nil). |
| 105 | func splitLeaf(leaf string) (cmd string, args []string) { |
| 106 | parts := strings.Fields(leaf) |
| 107 | if len(parts) == 0 { |
| 108 | return "", nil |
| 109 | } |
| 110 | return parts[0], parts[1:] |
| 111 | } |
| 112 | |
| 113 | // splitArgs builds path and body from args. |
| 114 | // Everything before "--" is the path (each arg is one component). |
| 115 | // Everything after "--" is the body (kept as-is, one element per line). |
| 116 | // If there's no "--", body is nil. |
| 117 | func splitArgs(args []string) (path []string, body []string) { |
| 118 | sawSep := false |
| 119 | for _, arg := range args { |
| 120 | if !sawSep && arg == "--" { |
| 121 | sawSep = true |
| 122 | continue |
| 123 | } |
| 124 | if !sawSep { |
| 125 | path = append(path, arg) |
| 126 | } else { |
| 127 | body = append(body, arg) |
| 128 | } |
| 129 | } |
| 130 | return |
| 131 | } |
| 132 | |
| 133 | func mustGetCwd() string { |
| 134 | dir, err := os.Getwd() |
| 135 | if err != nil { |
| 136 | panic(fmt.Sprintf("failed to get cwd: %v", err)) |
| 137 | } |
| 138 | return dir |
| 139 | } |