97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
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package buildfile
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import (
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"bufio"
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"errors"
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"io"
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"strings"
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)
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var ErrInvalidSyntax = errors.New("invalid instruction format")
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var ErrUnknownInstruction = errors.New("unknown instruction")
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type instruction_type byte
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const (
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// INSTALL one or more package(s)
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INSTALL instruction_type = iota
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// UPDATE all installed packages candidates
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UPDATE
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// REMOVE one or more package(s)
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REMOVE
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// SERVICE management (enable, disable, start, stop, restart, reload)
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SERVICE
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// CONF edits configuration files
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CONF
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)
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// instruction is self-explanatory
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type instruction struct {
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Type instruction_type
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// Sub command instruction-type-specific
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Sub []string
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Args string
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}
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// Reader is the buildfile reader
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type Reader struct {
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// linux distribution to run on
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distribution string
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Content []*instruction
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}
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// NewReader creates a new reader for the specified build file and linux distribution
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func NewReader(distro string, buildfile io.Reader) (*Reader, error) {
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r := &Reader{
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distribution: distro,
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Content: make([]*instruction, 0),
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}
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// read each line
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l, reader := 0, bufio.NewReader(buildfile)
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for {
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l++
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line, err := reader.ReadString('\n')
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if err == io.EOF {
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break
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} else if err != nil {
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return nil, LineError{l, err}
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}
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line = strings.Trim(line, " \t\n")
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// check line base syntax 'cmd args...'
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if len(line) < 5 || len(strings.Trim(line[0:3], " ")) < 3 || line[1] == ' ' || line[3] != ' ' {
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return nil, LineError{l, ErrInvalidSyntax}
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}
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// build instruction from line
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inst := &instruction{
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Type: INSTALL,
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Sub: make([]string, 0),
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Args: line[4:],
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}
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switch line[0:3] {
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case "ins":
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inst.Type = INSTALL
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case "upd":
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inst.Type = UPDATE
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case "del":
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inst.Type = REMOVE
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case "ser":
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inst.Type = SERVICE
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case "cnf":
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inst.Type = CONF
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default:
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return nil, LineError{l, ErrUnknownInstruction}
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}
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r.Content = append(r.Content, inst)
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}
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return r, nil
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}
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