97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
package instruction
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import (
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"fmt"
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"github.com/xdrm-brackets/nix-amer/internal/cnf"
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"os"
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"strings"
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)
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// ErrCannotSet is raised when there is an error trying to update
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// a field
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var ErrCannotSet = fmt.Errorf("cannot set the field")
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type set struct {
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raw string
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// File is the path to the file
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File string
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// Path is the configuration field path
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Path string
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// Value if the value to add or update
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Value string
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// Format is the configuration format in use
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Format *cnf.ConfigurationFormat
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}
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func (d *set) Raw() string { return strings.Join([]string{"set", d.raw}, " ") }
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func (d *set) Build(_args string) error {
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// 1. extract action (sub command)
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split := strings.Fields(_args)
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// 2. check path
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if len(split) < 2 {
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return fmt.Errorf("missing configuration path")
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}
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path := split[0]
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value := strings.Join(split[1:], "")
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// 3. check path separator
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splitPath := strings.Split(path, "@")
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if len(splitPath) > 2 {
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return fmt.Errorf("invalid path (additional '@'?)")
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}
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d.File = splitPath[0]
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if len(splitPath) > 1 { // add field path only if set
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d.Path = splitPath[1]
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}
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// add value
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d.Value = value
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d.raw = _args
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return nil
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}
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func (d set) Exec(ctx ExecutionContext) ([]byte, error) {
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// 1. get file / alias
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path := d.File
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if !strings.Contains(path, "/") {
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if p, exists := ctx.Alias[path]; exists {
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path = p
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}
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}
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// 2. fail if file not found
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if _, err := os.Stat(path); os.IsNotExist(err) {
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return nil, fmt.Errorf("cannot find file '%s'", path)
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}
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// 3. try to load format
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format, err := cnf.Load(path)
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if err != nil {
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return nil, err
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}
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// 4. try to update value
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if !format.Set(d.Path, d.Value) {
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return nil, ErrCannotSet
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}
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// 5. Update file
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file, err := os.OpenFile(path, os.O_WRONLY, 0)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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if _, err = format.WriteTo(file); err != nil {
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return nil, err
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}
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return nil, nil
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}
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