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format.go
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format.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package fncue
import (
"context"
"io"
"io/fs"
"os"
"cuelang.org/go/cue/errors"
"cuelang.org/go/cue/format"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnfs"
)
type Location interface {
Abs(...string) string
}
type Root interface {
Abs() string
}
func Format(ctx context.Context, fsfs fnfs.ReadWriteFS, loc fnfs.Location, name string, opts fnfs.WriteFileExtendedOpts) error {
contents, err := fs.ReadFile(fsfs, loc.Rel(name))
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
opts.CompareContents = true
opts.EnsureFileMode = false
return fnfs.WriteFileExtended(ctx, fsfs, loc.Rel(name), 0644, opts, func(w io.Writer) error {
return FormatSource(loc, w, contents)
})
}
func FormatSource(loc fnerrors.Location, w io.Writer, contents []byte) error {
formatted, err := format.Source(contents)
if err != nil {
switch e := errors.Unwrap(err).(type) {
case errors.Error:
format, args := e.Msg()
args = append(args, err)
return fnerrors.NewWithLocation(loc, format+": %w", args...)
default:
return fnerrors.NewWithLocation(loc, "failed to format: %w", err)
}
}
_, err = w.Write(formatted)
return err
}