/
cmd.go
295 lines (269 loc) · 7.58 KB
/
cmd.go
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// Package cmd contains chezmoi's commands.
package cmd
import (
"errors"
"fmt"
"os"
"regexp"
"runtime/debug"
"strconv"
"strings"
"github.com/charmbracelet/glamour"
"github.com/rs/zerolog"
"github.com/spf13/cobra"
"go.etcd.io/bbolt"
"go.uber.org/multierr"
"github.com/twpayne/chezmoi/v2/assets/chezmoi.io/docs/reference/commands"
"github.com/twpayne/chezmoi/v2/pkg/chezmoi"
)
// GitHub owner and repo for chezmoi itself.
const (
gitHubOwner = "twpayne"
gitHubRepo = "chezmoi"
)
var (
noArgs = []string(nil)
deDuplicateErrorRx = regexp.MustCompile(`:\s+`)
trailingSpaceRx = regexp.MustCompile(` +\n`)
helps = make(map[string]*help)
)
// A VersionInfo contains a version.
type VersionInfo struct {
Version string
Commit string
Date string
BuiltBy string
}
type help struct {
longHelp string
example string
}
func init() {
dirEntries, err := commands.FS.ReadDir(".")
if err != nil {
panic(err)
}
longHelpStyleConfig := glamour.ASCIIStyleConfig
longHelpStyleConfig.Code.StylePrimitive.BlockPrefix = ""
longHelpStyleConfig.Code.StylePrimitive.BlockSuffix = ""
longHelpStyleConfig.Emph.BlockPrefix = ""
longHelpStyleConfig.Emph.BlockSuffix = ""
longHelpStyleConfig.H2.Prefix = ""
longHelpTermRenderer, err := glamour.NewTermRenderer(
glamour.WithStyles(longHelpStyleConfig),
glamour.WithWordWrap(80),
)
if err != nil {
panic(err)
}
exampleStyleConfig := glamour.ASCIIStyleConfig
exampleStyleConfig.Code.StylePrimitive.BlockPrefix = ""
exampleStyleConfig.Code.StylePrimitive.BlockSuffix = ""
exampleStyleConfig.Document.Margin = nil
exampleTermRenderer, err := glamour.NewTermRenderer(
glamour.WithStyles(exampleStyleConfig),
glamour.WithWordWrap(80),
)
if err != nil {
panic(err)
}
for _, dirEntry := range dirEntries {
command := strings.TrimSuffix(dirEntry.Name(), ".md")
data, err := commands.FS.ReadFile(dirEntry.Name())
if err != nil {
panic(err)
}
help, err := extractHelp(command, data, longHelpTermRenderer, exampleTermRenderer)
if err != nil {
panic(err)
}
helps[command] = help
}
}
// MarshalZerologObject implements
// github.com/rs/zerolog.LogObjectMarshaler.MarshalZerologObject.
func (v VersionInfo) MarshalZerologObject(e *zerolog.Event) {
e.Str("version", v.Version)
e.Str("commit", v.Commit)
e.Str("date", v.Date)
e.Str("builtBy", v.BuiltBy)
}
// Main runs chezmoi and returns an exit code.
func Main(versionInfo VersionInfo, args []string) int {
if err := runMain(versionInfo, args); err != nil {
var errExitCode chezmoi.ExitCodeError
if errors.As(err, &errExitCode) {
return int(errExitCode)
}
fmt.Fprintf(os.Stderr, "chezmoi: %s\n", deDuplicateError(err))
return 1
}
return 0
}
// deDuplicateError returns err's human-readable string with duplicate components
// removed.
func deDuplicateError(err error) string {
components := deDuplicateErrorRx.Split(err.Error(), -1)
seenComponents := make(map[string]struct{}, len(components))
uniqueComponents := make([]string, 0, len(components))
for _, component := range components {
if _, ok := seenComponents[component]; ok {
continue
}
uniqueComponents = append(uniqueComponents, component)
seenComponents[component] = struct{}{}
}
return strings.Join(uniqueComponents, ": ")
}
// example returns command's example.
func example(command string) string {
help, ok := helps[command]
if !ok {
return ""
}
return help.example
}
// extractHelps returns the helps parse from r.
func extractHelp(
command string, data []byte, longHelpTermRenderer, exampleTermRenderer *glamour.TermRenderer,
) (*help, error) {
type stateType int
const (
stateReadTitle stateType = iota
stateInLongHelp
stateInOptions
stateInExample
stateInAdmonition
)
state := stateReadTitle
var longHelpLines []string
var exampleLines []string
for _, line := range strings.Split(string(data), "\n") {
switch state {
case stateReadTitle:
titleRx, err := regexp.Compile("# `" + command + "`")
if err != nil {
return nil, err
}
if titleRx.MatchString(line) {
state = stateInLongHelp
}
case stateInLongHelp:
switch {
case strings.HasPrefix(line, "## "):
state = stateInOptions
case line == "!!! example":
state = stateInExample
case strings.HasPrefix(line, "!!!"):
state = stateInAdmonition
default:
longHelpLines = append(longHelpLines, line)
}
case stateInOptions:
if line == "!!! example" {
state = stateInExample
}
case stateInExample:
exampleLines = append(exampleLines, strings.TrimPrefix(line, " "))
case stateInAdmonition:
if line == "!!! example" {
state = stateInExample
}
}
}
longHelp, err := renderLines(longHelpLines, longHelpTermRenderer)
if err != nil {
return nil, err
}
example, err := renderLines(exampleLines, exampleTermRenderer)
if err != nil {
return nil, err
}
return &help{
longHelp: "Description:\n" + longHelp,
example: example,
}, nil
}
// registerExcludeIncludeFlagCompletionFuncs registers the flag completion
// functions for the include and exclude flags of cmd. It panics on any error.
func registerExcludeIncludeFlagCompletionFuncs(cmd *cobra.Command) {
if err := multierr.Combine(
cmd.RegisterFlagCompletionFunc("exclude", chezmoi.EntryTypeSetFlagCompletionFunc),
cmd.RegisterFlagCompletionFunc("include", chezmoi.EntryTypeSetFlagCompletionFunc),
); err != nil {
panic(err)
}
}
// renderLines renders lines, trimming extraneous whitespace.
func renderLines(lines []string, termRenderer *glamour.TermRenderer) (string, error) {
renderedLines, err := termRenderer.Render(strings.Join(lines, "\n"))
if err != nil {
return "", err
}
renderedLines = trailingSpaceRx.ReplaceAllString(renderedLines, "\n")
renderedLines = strings.Trim(renderedLines, "\n")
return renderedLines, nil
}
// markPersistentFlagsRequired marks all of flags as required for cmd.
func markPersistentFlagsRequired(cmd *cobra.Command, flags ...string) {
for _, flag := range flags {
if err := cmd.MarkPersistentFlagRequired(flag); err != nil {
panic(err)
}
}
}
// mustLongHelp returns the long help for command or panics if no long help
// exists.
func mustLongHelp(command string) string {
help, ok := helps[command]
if !ok {
panic(fmt.Sprintf("missing long help for command %s", command))
}
return help.longHelp
}
// runMain runs chezmoi's main function.
func runMain(versionInfo VersionInfo, args []string) (err error) {
if versionInfo.Commit == "" || versionInfo.Date == "" {
if buildInfo, ok := debug.ReadBuildInfo(); ok {
var vcs, vcsRevision, vcsTime, vcsModified string
for _, setting := range buildInfo.Settings {
switch setting.Key {
case "vcs":
vcs = setting.Value
case "vcs.revision":
vcsRevision = setting.Value
case "vcs.time":
vcsTime = setting.Value
case "vcs.modified":
vcsModified = setting.Value
}
}
if versionInfo.Commit == "" && vcs == "git" {
versionInfo.Commit = vcsRevision
if modified, err := strconv.ParseBool(vcsModified); err == nil && modified {
versionInfo.Commit += "-dirty"
}
}
if versionInfo.Date == "" {
versionInfo.Date = vcsTime
}
}
}
var config *Config
if config, err = newConfig(
withVersionInfo(versionInfo),
); err != nil {
return err
}
defer multierr.AppendInvoke(&err, multierr.Close(config))
err = config.execute(args)
if errors.Is(err, bbolt.ErrTimeout) {
// Translate bbolt timeout errors into a friendlier message. As the
// persistent state is opened lazily, this error could occur at any
// time, so it's easiest to intercept it here.
err = errors.New(
"timeout obtaining persistent state lock, is another instance of chezmoi running?",
)
}
return
}