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// SPDX-License-Identifier: GPL-3.0-or-later
package model
import (
"crypto/sha256"
"fmt"
"os"
"strings"
"krino/internal/config"
"krino/internal/engine"
"krino/internal/sexp"
)
// MainSettings are the settings krino.conf carries for every directory,
// inside its (defaults ...) form, in the order the window shows them.
var MainSettings = []string{
"case", "fold", "recursive", "min-age", "max-read", "max-size",
"busy", "on-conflict",
}
// MainConf is krino.conf open for editing. Only its (defaults ...) block
// and the log path are edited here - the includes and the excludes are the
// file's own business, and the Text tab is where those are written (GUI
// design §5).
type MainConf struct {
File string
Text string
e *engine.Engine
saved string
stamp [32]byte
}
// OpenMain reads krino.conf.
func OpenMain(e *engine.Engine) (*MainConf, error) {
text, err := os.ReadFile(e.MainFile)
if err != nil {
return nil, err
}
return &MainConf{File: e.MainFile, Text: string(text), e: e,
saved: string(text), stamp: sha256.Sum256(text)}, nil
}
// Modified reports whether the text differs from what is on disk.
func (m *MainConf) Modified() bool { return m.Text != m.saved }
// Check loads the whole configuration with this text in place of the file
// and reports what is wrong with it.
func (m *MainConf) Check() []*config.Diag {
over := map[string][]byte{m.File: []byte(m.Text)}
_, diags := engine.LoadWith(m.File, over)
return diags
}
// Setting reads one default as it is written: "log" from the top level,
// everything else from inside (defaults ...).
func (m *MainConf) Setting(head string) (args string, set bool, err error) {
if head != "log" && !isMainSetting(head) {
return "", false, fmt.Errorf("model: %s is not a setting of krino.conf", head)
}
node, err := m.node(head)
if err != nil || node == nil {
return "", false, err
}
return argsOf(node, m.Text), true, nil
}
// SetSetting writes one default, or takes it out when args is empty. A
// setting that is not in the file yet is written into (defaults ...), which
// is created if the file has none.
func (m *MainConf) SetSetting(head, args string) error {
if head != "log" && !isMainSetting(head) {
return fmt.Errorf("model: %s is not a setting of krino.conf", head)
}
args = strings.TrimSpace(args)
node, err := m.node(head)
if err != nil {
return err
}
switch {
case node != nil && args == "":
start, end := lineStart(m.Text, node.Pos.Offset), lineEnd(m.Text, node.End.Offset)
m.Text = join(m.Text[:start], m.Text[end:])
case node != nil:
m.Text = m.Text[:node.Pos.Offset] + "(" + head + " " + args + ")" + m.Text[node.End.Offset:]
case head == "log":
m.Text = join(m.Text, "\n(log "+args+")\n")
default:
if err := m.setInDefaults(head, args); err != nil {
return err
}
}
return nil
}
// setInDefaults writes a setting inside (defaults ...), adding the form
// when the file has none.
func (m *MainConf) setInDefaults(head, args string) error {
defaults, err := m.topLevel("defaults")
if err != nil {
return err
}
if defaults == nil {
m.Text = join(m.Text, "\n(defaults\n ("+head+" "+args+"))\n")
return nil
}
// Just inside the closing paren, on a line of its own.
at := defaults.End.Offset - 1
m.Text = m.Text[:at] + "\n (" + head + " " + args + ")" + m.Text[at:]
return nil
}
// node is the form for a setting: (log ...) at the top level, the rest
// inside (defaults ...).
func (m *MainConf) node(head string) (*sexp.Node, error) {
if head == "log" {
return m.topLevel("log")
}
defaults, err := m.topLevel("defaults")
if err != nil || defaults == nil {
return nil, err
}
for _, n := range defaults.Args() {
if n.Kind == sexp.List && n.Head() == head {
return n, nil
}
}
return nil, nil
}
// topLevel is the top-level form with that head, or nil.
func (m *MainConf) topLevel(head string) (*sexp.Node, error) {
nodes, err := sexp.Parse(m.File, []byte(m.Text))
if err != nil {
return nil, err
}
for _, n := range nodes {
if n.Kind == sexp.List && n.Head() == head {
return n, nil
}
}
return nil, nil
}
// Save writes krino.conf, refusing a file that will not load and one that
// changed on disk since it was opened - the rules the directory files are
// saved by (GUI design §5.3). The previous text is kept as krino.conf.bak.
func (m *MainConf) Save() error {
if diags := m.Check(); len(diags) > 0 {
return fmt.Errorf("%s", diags[0])
}
on, err := os.ReadFile(m.File)
if err != nil {
return err
}
if sha256.Sum256(on) != m.stamp {
return ErrChangedOnDisk
}
mode := os.FileMode(0o600)
if fi, err := os.Stat(m.File); err == nil {
mode = fi.Mode().Perm()
}
if err := os.WriteFile(m.File+".bak", on, mode); err != nil {
return err
}
text := []byte(m.Text)
if err := config.Replace(m.File, text); err != nil {
return err
}
m.saved, m.stamp = m.Text, sha256.Sum256(text)
return nil
}
// isMainSetting reports whether head is one of the defaults.
func isMainSetting(head string) bool {
for _, s := range MainSettings {
if s == head {
return true
}
}
return false
}
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