/
attr.go
368 lines (350 loc) · 9.32 KB
/
attr.go
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package chezmoi
import (
"io/fs"
"log/slog"
"strings"
)
// A SourceFileTargetType is a the type of a target represented by a file in the
// source state. A file in the source state can represent a file, script, or
// symlink in the target state.
type SourceFileTargetType int
// Source file types.
const (
SourceFileTypeCreate SourceFileTargetType = iota
SourceFileTypeFile
SourceFileTypeModify
SourceFileTypeRemove
SourceFileTypeScript
SourceFileTypeSymlink
)
var sourceFileTypeStrs = map[SourceFileTargetType]string{
SourceFileTypeCreate: "create",
SourceFileTypeFile: "file",
SourceFileTypeModify: "modify",
SourceFileTypeRemove: "remove",
SourceFileTypeScript: "script",
SourceFileTypeSymlink: "symlink",
}
// A ScriptOrder defines when a script should be executed.
type ScriptOrder int
// Script orders.
const (
ScriptOrderBefore ScriptOrder = -1
ScriptOrderDuring ScriptOrder = 0
ScriptOrderAfter ScriptOrder = 1
)
// A ScriptCondition defines under what conditions a script should be executed.
type ScriptCondition string
// Script conditions.
const (
ScriptConditionNone ScriptCondition = ""
ScriptConditionAlways ScriptCondition = "always"
ScriptConditionOnce ScriptCondition = "once"
ScriptConditionOnChange ScriptCondition = "onchange"
)
// DirAttr holds attributes parsed from a source directory name.
type DirAttr struct {
TargetName string
Exact bool
External bool
Private bool
ReadOnly bool
Remove bool
}
// A FileAttr holds attributes parsed from a source file name.
type FileAttr struct {
TargetName string
Type SourceFileTargetType
Condition ScriptCondition
Empty bool
Encrypted bool
Executable bool
Order ScriptOrder
Private bool
ReadOnly bool
Template bool
}
// parseDirAttr parses a single directory name in the source state.
func parseDirAttr(name string) DirAttr {
name, remove := strings.CutPrefix(name, removePrefix)
name, external := strings.CutPrefix(name, externalPrefix)
name, exact := strings.CutPrefix(name, exactPrefix)
name, private := strings.CutPrefix(name, privatePrefix)
name, readOnly := strings.CutPrefix(name, readOnlyPrefix)
switch {
case strings.HasPrefix(name, dotPrefix):
name = "." + name[len(dotPrefix):]
case strings.HasPrefix(name, literalPrefix):
name = name[len(literalPrefix):]
}
return DirAttr{
TargetName: name,
Exact: exact,
External: external,
Private: private,
ReadOnly: readOnly,
Remove: remove,
}
}
// LogValue implements log/slog.LogValuer.LogValue.
func (da DirAttr) LogValue() slog.Value {
return slog.GroupValue(
slog.String("TargetName", da.TargetName),
slog.Bool("Exact", da.Exact),
slog.Bool("External", da.External),
slog.Bool("Private", da.Private),
slog.Bool("ReadOnly", da.ReadOnly),
slog.Bool("Remove", da.Remove),
)
}
// SourceName returns da's source name.
func (da DirAttr) SourceName() string {
sourceName := ""
if da.Remove {
sourceName += removePrefix
}
if da.External {
sourceName += externalPrefix
}
if da.Exact {
sourceName += exactPrefix
}
if da.Private {
sourceName += privatePrefix
}
if da.ReadOnly {
sourceName += readOnlyPrefix
}
switch {
case strings.HasPrefix(da.TargetName, "."):
sourceName += dotPrefix + da.TargetName[len("."):]
case dirPrefixRx.MatchString(da.TargetName):
sourceName += literalPrefix + da.TargetName
default:
sourceName += da.TargetName
}
return sourceName
}
// perm returns da's file mode.
func (da DirAttr) perm() fs.FileMode {
perm := fs.ModePerm
if da.Private {
perm &^= 0o77
}
if da.ReadOnly {
perm &^= 0o222
}
return perm
}
// parseFileAttr parses a source file name in the source state.
func parseFileAttr(sourceName, encryptedSuffix string) FileAttr {
var (
sourceFileType = SourceFileTypeFile
name = sourceName
condition = ScriptConditionNone
empty = false
encrypted = false
executable = false
order = ScriptOrderDuring
private = false
readOnly = false
template = false
)
switch {
case strings.HasPrefix(name, createPrefix):
sourceFileType = SourceFileTypeCreate
name = name[len(createPrefix):]
name, encrypted = strings.CutPrefix(name, encryptedPrefix)
name, private = strings.CutPrefix(name, privatePrefix)
name, readOnly = strings.CutPrefix(name, readOnlyPrefix)
name, empty = strings.CutPrefix(name, emptyPrefix)
name, executable = strings.CutPrefix(name, executablePrefix)
case strings.HasPrefix(name, removePrefix):
sourceFileType = SourceFileTypeRemove
name = name[len(removePrefix):]
case strings.HasPrefix(name, runPrefix):
sourceFileType = SourceFileTypeScript
name = name[len(runPrefix):]
switch {
case strings.HasPrefix(name, oncePrefix):
name = name[len(oncePrefix):]
condition = ScriptConditionOnce
case strings.HasPrefix(name, onChangePrefix):
name = name[len(onChangePrefix):]
condition = ScriptConditionOnChange
default:
condition = ScriptConditionAlways
}
switch {
case strings.HasPrefix(name, beforePrefix):
name = name[len(beforePrefix):]
order = ScriptOrderBefore
case strings.HasPrefix(name, afterPrefix):
name = name[len(afterPrefix):]
order = ScriptOrderAfter
}
case strings.HasPrefix(name, symlinkPrefix):
sourceFileType = SourceFileTypeSymlink
name = name[len(symlinkPrefix):]
case strings.HasPrefix(name, modifyPrefix):
sourceFileType = SourceFileTypeModify
name = name[len(modifyPrefix):]
name, encrypted = strings.CutPrefix(name, encryptedPrefix)
name, private = strings.CutPrefix(name, privatePrefix)
name, readOnly = strings.CutPrefix(name, readOnlyPrefix)
name, executable = strings.CutPrefix(name, executablePrefix)
default:
name, encrypted = strings.CutPrefix(name, encryptedPrefix)
name, private = strings.CutPrefix(name, privatePrefix)
name, readOnly = strings.CutPrefix(name, readOnlyPrefix)
name, empty = strings.CutPrefix(name, emptyPrefix)
name, executable = strings.CutPrefix(name, executablePrefix)
}
switch {
case strings.HasPrefix(name, dotPrefix):
name = "." + name[len(dotPrefix):]
case strings.HasPrefix(name, literalPrefix):
name = name[len(literalPrefix):]
}
if encrypted {
name, _ = strings.CutSuffix(name, encryptedSuffix)
}
switch {
case strings.HasSuffix(name, literalSuffix):
name = name[:len(name)-len(literalSuffix)]
case strings.HasSuffix(name, TemplateSuffix):
name = name[:len(name)-len(TemplateSuffix)]
template = true
name, _ = strings.CutSuffix(name, literalSuffix)
}
return FileAttr{
TargetName: name,
Type: sourceFileType,
Condition: condition,
Empty: empty,
Encrypted: encrypted,
Executable: executable,
Order: order,
Private: private,
ReadOnly: readOnly,
Template: template,
}
}
// LogValue implements log/slog.LogValuer.LogValue.
func (fa FileAttr) LogValue() slog.Value {
return slog.GroupValue(
slog.String("TargetName", fa.TargetName),
slog.String("Type", sourceFileTypeStrs[fa.Type]),
slog.String("Condition", string(fa.Condition)),
slog.Bool("Empty", fa.Empty),
slog.Bool("Encrypted", fa.Encrypted),
slog.Bool("Executable", fa.Executable),
slog.Int("Order", int(fa.Order)),
slog.Bool("Private", fa.Private),
slog.Bool("ReadOnly", fa.ReadOnly),
slog.Bool("Template", fa.Template),
)
}
// SourceName returns fa's source name.
func (fa FileAttr) SourceName(encryptedSuffix string) string {
sourceName := ""
switch fa.Type {
case SourceFileTypeCreate:
sourceName = createPrefix
if fa.Encrypted {
sourceName += encryptedPrefix
}
if fa.Private {
sourceName += privatePrefix
}
if fa.ReadOnly {
sourceName += readOnlyPrefix
}
if fa.Empty {
sourceName += emptyPrefix
}
if fa.Executable {
sourceName += executablePrefix
}
case SourceFileTypeFile:
if fa.Encrypted {
sourceName += encryptedPrefix
}
if fa.Private {
sourceName += privatePrefix
}
if fa.ReadOnly {
sourceName += readOnlyPrefix
}
if fa.Empty {
sourceName += emptyPrefix
}
if fa.Executable {
sourceName += executablePrefix
}
case SourceFileTypeModify:
sourceName = modifyPrefix
if fa.Encrypted {
sourceName += encryptedPrefix
}
if fa.Private {
sourceName += privatePrefix
}
if fa.ReadOnly {
sourceName += readOnlyPrefix
}
if fa.Executable {
sourceName += executablePrefix
}
case SourceFileTypeRemove:
sourceName = removePrefix
case SourceFileTypeScript:
sourceName = runPrefix
switch fa.Condition {
case ScriptConditionOnce:
sourceName += oncePrefix
case ScriptConditionOnChange:
sourceName += onChangePrefix
}
switch fa.Order {
case ScriptOrderBefore:
sourceName += beforePrefix
case ScriptOrderAfter:
sourceName += afterPrefix
}
case SourceFileTypeSymlink:
sourceName = symlinkPrefix
}
switch {
case strings.HasPrefix(fa.TargetName, "."):
sourceName += dotPrefix + fa.TargetName[len("."):]
case filePrefixRx.MatchString(fa.TargetName):
sourceName += literalPrefix + fa.TargetName
default:
sourceName += fa.TargetName
}
if fileSuffixRx.MatchString(fa.TargetName) {
sourceName += literalSuffix
}
if fa.Template {
sourceName += TemplateSuffix
}
if fa.Encrypted {
sourceName += encryptedSuffix
}
return sourceName
}
// perm returns fa's permissions.
func (fa FileAttr) perm() fs.FileMode {
perm := fs.FileMode(0o666)
if fa.Executable {
perm |= 0o111
}
if fa.Private {
perm &^= 0o77
}
if fa.ReadOnly {
perm &^= 0o222
}
return perm
}