| Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame] | 1 | package cobra |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os" |
| 8 | "strings" |
| 9 | ) |
| 10 | |
| 11 | // GenZshCompletionFile generates zsh completion file. |
| 12 | func (c *Command) GenZshCompletionFile(filename string) error { |
| 13 | outFile, err := os.Create(filename) |
| 14 | if err != nil { |
| 15 | return err |
| 16 | } |
| 17 | defer outFile.Close() |
| 18 | |
| 19 | return c.GenZshCompletion(outFile) |
| 20 | } |
| 21 | |
| 22 | // GenZshCompletion generates a zsh completion file and writes to the passed writer. |
| 23 | func (c *Command) GenZshCompletion(w io.Writer) error { |
| 24 | buf := new(bytes.Buffer) |
| 25 | |
| 26 | writeHeader(buf, c) |
| 27 | maxDepth := maxDepth(c) |
| 28 | writeLevelMapping(buf, maxDepth) |
| 29 | writeLevelCases(buf, maxDepth, c) |
| 30 | |
| 31 | _, err := buf.WriteTo(w) |
| 32 | return err |
| 33 | } |
| 34 | |
| 35 | func writeHeader(w io.Writer, cmd *Command) { |
| 36 | fmt.Fprintf(w, "#compdef %s\n\n", cmd.Name()) |
| 37 | } |
| 38 | |
| 39 | func maxDepth(c *Command) int { |
| 40 | if len(c.Commands()) == 0 { |
| 41 | return 0 |
| 42 | } |
| 43 | maxDepthSub := 0 |
| 44 | for _, s := range c.Commands() { |
| 45 | subDepth := maxDepth(s) |
| 46 | if subDepth > maxDepthSub { |
| 47 | maxDepthSub = subDepth |
| 48 | } |
| 49 | } |
| 50 | return 1 + maxDepthSub |
| 51 | } |
| 52 | |
| 53 | func writeLevelMapping(w io.Writer, numLevels int) { |
| 54 | fmt.Fprintln(w, `_arguments \`) |
| 55 | for i := 1; i <= numLevels; i++ { |
| 56 | fmt.Fprintf(w, ` '%d: :->level%d' \`, i, i) |
| 57 | fmt.Fprintln(w) |
| 58 | } |
| 59 | fmt.Fprintf(w, ` '%d: :%s'`, numLevels+1, "_files") |
| 60 | fmt.Fprintln(w) |
| 61 | } |
| 62 | |
| 63 | func writeLevelCases(w io.Writer, maxDepth int, root *Command) { |
| 64 | fmt.Fprintln(w, "case $state in") |
| 65 | defer fmt.Fprintln(w, "esac") |
| 66 | |
| 67 | for i := 1; i <= maxDepth; i++ { |
| 68 | fmt.Fprintf(w, " level%d)\n", i) |
| 69 | writeLevel(w, root, i) |
| 70 | fmt.Fprintln(w, " ;;") |
| 71 | } |
| 72 | fmt.Fprintln(w, " *)") |
| 73 | fmt.Fprintln(w, " _arguments '*: :_files'") |
| 74 | fmt.Fprintln(w, " ;;") |
| 75 | } |
| 76 | |
| 77 | func writeLevel(w io.Writer, root *Command, i int) { |
| 78 | fmt.Fprintf(w, " case $words[%d] in\n", i) |
| 79 | defer fmt.Fprintln(w, " esac") |
| 80 | |
| 81 | commands := filterByLevel(root, i) |
| 82 | byParent := groupByParent(commands) |
| 83 | |
| 84 | for p, c := range byParent { |
| 85 | names := names(c) |
| 86 | fmt.Fprintf(w, " %s)\n", p) |
| 87 | fmt.Fprintf(w, " _arguments '%d: :(%s)'\n", i, strings.Join(names, " ")) |
| 88 | fmt.Fprintln(w, " ;;") |
| 89 | } |
| 90 | fmt.Fprintln(w, " *)") |
| 91 | fmt.Fprintln(w, " _arguments '*: :_files'") |
| 92 | fmt.Fprintln(w, " ;;") |
| 93 | |
| 94 | } |
| 95 | |
| 96 | func filterByLevel(c *Command, l int) []*Command { |
| 97 | cs := make([]*Command, 0) |
| 98 | if l == 0 { |
| 99 | cs = append(cs, c) |
| 100 | return cs |
| 101 | } |
| 102 | for _, s := range c.Commands() { |
| 103 | cs = append(cs, filterByLevel(s, l-1)...) |
| 104 | } |
| 105 | return cs |
| 106 | } |
| 107 | |
| 108 | func groupByParent(commands []*Command) map[string][]*Command { |
| 109 | m := make(map[string][]*Command) |
| 110 | for _, c := range commands { |
| 111 | parent := c.Parent() |
| 112 | if parent == nil { |
| 113 | continue |
| 114 | } |
| 115 | m[parent.Name()] = append(m[parent.Name()], c) |
| 116 | } |
| 117 | return m |
| 118 | } |
| 119 | |
| 120 | func names(commands []*Command) []string { |
| 121 | ns := make([]string, len(commands)) |
| 122 | for i, c := range commands { |
| 123 | ns[i] = c.Name() |
| 124 | } |
| 125 | return ns |
| 126 | } |