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cmd.go
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cmd.go
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// Package cmd contains chezmoi's commands.
package cmd
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
"github.com/charmbracelet/glamour"
"github.com/spf13/cobra"
"github.com/twpayne/chezmoi/docs"
)
// Command annotations.
const (
doesNotRequireValidConfig = "chezmoi_does_not_require_valid_config"
modifiesConfigFile = "chezmoi_modifies_config_file"
modifiesDestinationDirectory = "chezmoi_modifies_destination_directory"
modifiesSourceDirectory = "chezmoi_modifies_source_directory"
persistentStateMode = "chezmoi_persistent_state_mode"
requiresConfigDirectory = "chezmoi_requires_config_directory"
requiresSourceDirectory = "chezmoi_requires_source_directory"
runsCommands = "chezmoi_runs_commands"
)
// Persistent state modes.
const (
persistentStateModeEmpty = "empty"
persistentStateModeReadOnly = "read-only"
persistentStateModeReadMockWrite = "read-mock-write"
persistentStateModeReadWrite = "read-write"
)
var (
noArgs = []string(nil)
commandsRx = regexp.MustCompile(`^## Commands`)
commandRx = regexp.MustCompile("^### `(\\S+)`")
exampleRx = regexp.MustCompile("^#### `\\w+` examples")
endOfCommandsRx = regexp.MustCompile(`^## `)
trailingSpaceRx = regexp.MustCompile(` +\n`)
helps map[string]*help
)
// An ErrExitCode indicates the the main program should exit with the given
// code.
type ErrExitCode int
func (e ErrExitCode) Error() string { return "" }
// A VersionInfo contains a version.
type VersionInfo struct {
Version string
Commit string
Date string
BuiltBy string
}
type help struct {
long string
example string
}
func init() {
reference, err := docs.FS.ReadFile("REFERENCE.md")
if err != nil {
panic(err)
}
helps, err = extractHelps(bytes.NewReader(reference))
if err != nil {
panic(err)
}
}
// Main runs chezmoi and returns an exit code.
func Main(versionInfo VersionInfo, args []string) int {
if err := runMain(versionInfo, args); err != nil {
if s := err.Error(); s != "" {
fmt.Fprintf(os.Stderr, "chezmoi: %s\n", s)
}
errExitCode := ErrExitCode(1)
_ = errors.As(err, &errExitCode)
return int(errExitCode)
}
return 0
}
func boolAnnotation(cmd *cobra.Command, key string) bool {
value, ok := cmd.Annotations[key]
if !ok {
return false
}
boolValue, err := strconv.ParseBool(value)
if err != nil {
panic(err)
}
return boolValue
}
func example(command string) string {
help, ok := helps[command]
if !ok {
return ""
}
return help.example
}
func extractHelps(r io.Reader) (map[string]*help, error) {
longStyleConfig := glamour.ASCIIStyleConfig
longStyleConfig.H4.Prefix = ""
longTermRenderer, err := glamour.NewTermRenderer(
glamour.WithStyles(longStyleConfig),
glamour.WithWordWrap(80),
)
if err != nil {
return nil, err
}
examplesStyleConfig := glamour.ASCIIStyleConfig
examplesStyleConfig.Document.Margin = nil
examplesTermRenderer, err := glamour.NewTermRenderer(
glamour.WithStyles(examplesStyleConfig),
glamour.WithWordWrap(80),
)
if err != nil {
return nil, err
}
var (
state = "find-commands"
sb = &strings.Builder{}
h *help
)
saveAndReset := func() error {
var tr *glamour.TermRenderer
switch state {
case "in-command":
tr = longTermRenderer
case "in-example":
tr = examplesTermRenderer
default:
panic(fmt.Sprintf("%s: invalid state", state))
}
s, err := tr.Render(sb.String())
if err != nil {
return err
}
s = trailingSpaceRx.ReplaceAllString(s, "\n")
s = strings.Trim(s, "\n")
switch state {
case "in-command":
h.long = "Description:\n" + s
case "in-example":
h.example = s
default:
panic(fmt.Sprintf("%s: invalid state", state))
}
sb.Reset()
return nil
}
helps := make(map[string]*help)
s := bufio.NewScanner(r)
FOR:
for s.Scan() {
switch state {
case "find-commands":
if commandsRx.MatchString(s.Text()) {
state = "find-first-command"
}
case "find-first-command":
if m := commandRx.FindStringSubmatch(s.Text()); m != nil {
h = &help{}
helps[m[1]] = h
state = "in-command"
}
case "in-command", "in-example":
m := commandRx.FindStringSubmatch(s.Text())
switch {
case m != nil:
if err := saveAndReset(); err != nil {
return nil, err
}
h = &help{}
helps[m[1]] = h
state = "in-command"
case exampleRx.MatchString(s.Text()):
if err := saveAndReset(); err != nil {
return nil, err
}
state = "in-example"
case endOfCommandsRx.MatchString(s.Text()):
if err := saveAndReset(); err != nil {
return nil, err
}
break FOR
default:
if _, err := sb.WriteString(s.Text()); err != nil {
return nil, err
}
if err := sb.WriteByte('\n'); err != nil {
return nil, err
}
}
}
}
if err := s.Err(); err != nil {
return nil, err
}
return helps, nil
}
func markPersistentFlagsRequired(cmd *cobra.Command, flags ...string) {
for _, flag := range flags {
if err := cmd.MarkPersistentFlagRequired(flag); err != nil {
panic(err)
}
}
}
func mustLongHelp(command string) string {
help, ok := helps[command]
if !ok {
panic(fmt.Sprintf("missing long help for command %s", command))
}
return help.long
}
func runMain(versionInfo VersionInfo, args []string) error {
config, err := newConfig(
withVersionInfo(versionInfo),
)
if err != nil {
return err
}
return config.execute(args)
}