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container/absolute: wrap safe stdlib functions

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These functions do not change the absoluteness of a pathname.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2025-08-10 03:10:13 +09:00
parent 02271583fb
commit 41ac2be965
4 changed files with 64 additions and 12 deletions
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30
container/absolute.go
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@@ -5,10 +5,12 @@ import (
"errors"
"fmt"
"path"
"slices"
"strings"
"syscall"
)
// AbsoluteError is returned by [NewAbsolute] and holds the invalid pathname.
// AbsoluteError is returned by [NewAbs] and holds the invalid pathname.
type AbsoluteError struct {
Pathname string
}
@@ -37,23 +39,31 @@ func (a *Absolute) String() string {
return a.pathname
}
// NewAbsolute checks pathname and returns a new [Absolute] if pathname is absolute.
func NewAbsolute(pathname string) (*Absolute, error) {
// NewAbs checks pathname and returns a new [Absolute] if pathname is absolute.
func NewAbs(pathname string) (*Absolute, error) {
if !isAbs(pathname) {
return nil, &AbsoluteError{pathname}
}
return &Absolute{pathname}, nil
}
// MustAbs calls [NewAbsolute] and panics on error.
// MustAbs calls [NewAbs] and panics on error.
func MustAbs(pathname string) *Absolute {
if a, err := NewAbsolute(pathname); err != nil {
if a, err := NewAbs(pathname); err != nil {
panic(err.Error())
} else {
return a
}
}
// Append calls [path.Join] with [Absolute] as the first element.
func (a *Absolute) Append(elem ...string) *Absolute {
return &Absolute{path.Join(append([]string{a.String()}, elem...)...)}
}
// Dir calls [path.Dir] with [Absolute] as its argument.
func (a *Absolute) Dir() *Absolute { return &Absolute{path.Dir(a.String())} }
func (a *Absolute) GobEncode() ([]byte, error) { return []byte(a.String()), nil }
func (a *Absolute) GobDecode(data []byte) error {
pathname := string(data)
@@ -76,3 +86,13 @@ func (a *Absolute) UnmarshalJSON(data []byte) error {
a.pathname = pathname
return nil
}
// SortAbs calls [slices.SortFunc] for a slice of [Absolute].
func SortAbs(x []*Absolute) {
slices.SortFunc(x, func(a, b *Absolute) int { return strings.Compare(a.String(), b.String()) })
}
// CompactAbs calls [slices.CompactFunc] for a slice of [Absolute].
func CompactAbs(s []*Absolute) []*Absolute {
return slices.CompactFunc(s, func(a *Absolute, b *Absolute) bool { return a.String() == b.String() })
}