127 lines
2.7 KiB
Go
127 lines
2.7 KiB
Go
package cobra
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strings"
|
|
)
|
|
|
|
// GenZshCompletionFile generates zsh completion file.
|
|
func (c *Command) GenZshCompletionFile(filename string) error {
|
|
outFile, err := os.Create(filename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer outFile.Close()
|
|
|
|
return c.GenZshCompletion(outFile)
|
|
}
|
|
|
|
// GenZshCompletion generates a zsh completion file and writes to the passed writer.
|
|
func (c *Command) GenZshCompletion(w io.Writer) error {
|
|
buf := new(bytes.Buffer)
|
|
|
|
writeHeader(buf, c)
|
|
maxDepth := maxDepth(c)
|
|
writeLevelMapping(buf, maxDepth)
|
|
writeLevelCases(buf, maxDepth, c)
|
|
|
|
_, err := buf.WriteTo(w)
|
|
return err
|
|
}
|
|
|
|
func writeHeader(w io.Writer, cmd *Command) {
|
|
fmt.Fprintf(w, "#compdef %s\n\n", cmd.Name())
|
|
}
|
|
|
|
func maxDepth(c *Command) int {
|
|
if len(c.Commands()) == 0 {
|
|
return 0
|
|
}
|
|
maxDepthSub := 0
|
|
for _, s := range c.Commands() {
|
|
subDepth := maxDepth(s)
|
|
if subDepth > maxDepthSub {
|
|
maxDepthSub = subDepth
|
|
}
|
|
}
|
|
return 1 + maxDepthSub
|
|
}
|
|
|
|
func writeLevelMapping(w io.Writer, numLevels int) {
|
|
fmt.Fprintln(w, `_arguments \`)
|
|
for i := 1; i <= numLevels; i++ {
|
|
fmt.Fprintf(w, ` '%d: :->level%d' \`, i, i)
|
|
fmt.Fprintln(w)
|
|
}
|
|
fmt.Fprintf(w, ` '%d: :%s'`, numLevels+1, "_files")
|
|
fmt.Fprintln(w)
|
|
}
|
|
|
|
func writeLevelCases(w io.Writer, maxDepth int, root *Command) {
|
|
fmt.Fprintln(w, "case $state in")
|
|
defer fmt.Fprintln(w, "esac")
|
|
|
|
for i := 1; i <= maxDepth; i++ {
|
|
fmt.Fprintf(w, " level%d)\n", i)
|
|
writeLevel(w, root, i)
|
|
fmt.Fprintln(w, " ;;")
|
|
}
|
|
fmt.Fprintln(w, " *)")
|
|
fmt.Fprintln(w, " _arguments '*: :_files'")
|
|
fmt.Fprintln(w, " ;;")
|
|
}
|
|
|
|
func writeLevel(w io.Writer, root *Command, i int) {
|
|
fmt.Fprintf(w, " case $words[%d] in\n", i)
|
|
defer fmt.Fprintln(w, " esac")
|
|
|
|
commands := filterByLevel(root, i)
|
|
byParent := groupByParent(commands)
|
|
|
|
for p, c := range byParent {
|
|
names := names(c)
|
|
fmt.Fprintf(w, " %s)\n", p)
|
|
fmt.Fprintf(w, " _arguments '%d: :(%s)'\n", i, strings.Join(names, " "))
|
|
fmt.Fprintln(w, " ;;")
|
|
}
|
|
fmt.Fprintln(w, " *)")
|
|
fmt.Fprintln(w, " _arguments '*: :_files'")
|
|
fmt.Fprintln(w, " ;;")
|
|
|
|
}
|
|
|
|
func filterByLevel(c *Command, l int) []*Command {
|
|
cs := make([]*Command, 0)
|
|
if l == 0 {
|
|
cs = append(cs, c)
|
|
return cs
|
|
}
|
|
for _, s := range c.Commands() {
|
|
cs = append(cs, filterByLevel(s, l-1)...)
|
|
}
|
|
return cs
|
|
}
|
|
|
|
func groupByParent(commands []*Command) map[string][]*Command {
|
|
m := make(map[string][]*Command)
|
|
for _, c := range commands {
|
|
parent := c.Parent()
|
|
if parent == nil {
|
|
continue
|
|
}
|
|
m[parent.Name()] = append(m[parent.Name()], c)
|
|
}
|
|
return m
|
|
}
|
|
|
|
func names(commands []*Command) []string {
|
|
ns := make([]string, len(commands))
|
|
for i, c := range commands {
|
|
ns[i] = c.Name()
|
|
}
|
|
return ns
|
|
}
|