nix-amer/internal/instruction/set.go

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package instruction
import (
"fmt"
"git.xdrm.io/go/nix-amer/internal/cnf"
"os"
"strings"
)
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// ErrCannotSet is raised when there is an error trying to update
// a field
var ErrCannotSet = fmt.Errorf("cannot set the field")
type set struct {
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raw string
// File is the path to the file
File string
// Path is the configuration field path
Path string
// Value if the value to add or update
Value string
// Format is the configuration format in use
Format *cnf.ConfigurationFormat
}
func (d *set) Raw() string { return d.raw }
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func (d *set) Build(_args string) error {
// 1. extract action (sub command)
split := strings.Fields(_args)
// 2. check path
if len(split) < 2 {
return fmt.Errorf("missing configuration path")
}
path := split[0]
value := strings.Join(split[1:], "")
// 3. check path separator
splitPath := strings.Split(path, "@")
if len(splitPath) > 2 {
return fmt.Errorf("invalid path (additional '@'?)")
}
d.File = splitPath[0]
if len(splitPath) > 1 { // add field path only if set
d.Path = splitPath[1]
}
// add value
d.Value = value
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d.raw = _args
return nil
}
func (d set) Exec(ctx ExecutionContext) ([]byte, error) {
// 1. try to load format
format, err := cnf.Load(d.File)
if err != nil {
return nil, err
}
// 2. try to update value
if !format.Set(d.Path, d.Value) {
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return nil, ErrCannotSet
}
// 3. Update file
file, err := os.OpenFile(d.File, os.O_WRONLY, 0)
if err != nil {
return nil, err
}
defer file.Close()
if _, err = format.WriteTo(file); err != nil {
return nil, err
}
return nil, nil
}