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// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
package cli
import (
"encoding/json"
"fmt"
"io"
"os"
"strings"
)
func json_input_parser(data []byte, shell_state map[string]string) ([][]string, error) {
ans := make([][]string, 0, 32)
err := json.Unmarshal(data, &ans)
return ans, err
}
func json_output_serializer(completions []*Completions, shell_state map[string]string) ([]byte, error) {
return json.Marshal(completions)
}
type completion_script_func func(commands []string) (string, error)
type parser_func func(data []byte, shell_state map[string]string) ([][]string, error)
type serializer_func func(completions []*Completions, shell_state map[string]string) ([]byte, error)
var completion_scripts = make(map[string]completion_script_func, 4)
var input_parsers = make(map[string]parser_func, 4)
var output_serializers = make(map[string]serializer_func, 4)
var init_completions = make(map[string]func(*Completions), 4)
func init() {
input_parsers["json"] = json_input_parser
output_serializers["json"] = json_output_serializer
}
var registered_exes []func(root *Command)
func RegisterExeForCompletion(x func(root *Command)) {
if registered_exes == nil {
registered_exes = make([]func(root *Command), 0, 4)
}
registered_exes = append(registered_exes, x)
}
func GenerateCompletions(args []string) error {
output_type := "json"
if len(args) > 0 {
output_type = args[0]
args = args[1:]
}
n := len(args)
if n < 1 {
n = 1
}
if output_type == "setup" {
if len(args) == 0 {
return fmt.Errorf("The shell must be specified")
}
shell_name := args[0]
args = args[1:]
completion_script := completion_scripts[shell_name]
if completion_script == nil {
return fmt.Errorf("Unsupported shell: %s", shell_name)
}
output, err := completion_script(args)
if err == nil {
_, err = os.Stdout.WriteString(output)
}
return err
}
shell_state := make(map[string]string, n)
for _, arg := range args {
k, v, found := strings.Cut(arg, "=")
if !found {
return fmt.Errorf("Invalid shell state specification: %s", arg)
}
shell_state[k] = v
}
input_parser := input_parsers[output_type]
output_serializer := output_serializers[output_type]
if input_parser == nil || output_serializer == nil {
return fmt.Errorf("Unknown output type: %s", output_type)
}
data, err := io.ReadAll(os.Stdin)
if err != nil {
return err
}
// debugf("%#v", string(data))
all_argv, err := input_parser(data, shell_state)
if err != nil {
return err
}
var root = NewRootCommand()
for _, re := range registered_exes {
re(root)
}
err = root.Validate()
if err != nil {
return err
}
all_completions := make([]*Completions, 0, 1)
for _, argv := range all_argv {
all_completions = append(all_completions, root.GetCompletions(argv, init_completions[output_type]))
root.ResetAfterParseArgs()
}
output, err := output_serializer(all_completions, shell_state)
if err == nil {
_, err = os.Stdout.Write(output)
}
return err
}
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