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Copy pathclient.go
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Copy pathclient.go
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233 lines (195 loc) · 5.21 KB
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package main
import (
"bufio"
"fmt"
"io"
"log"
"net"
"os"
"slices"
"strings"
"sync"
"time"
"github.com/gdamore/tcell/v3"
"golang.org/x/term"
)
type State struct {
mutex sync.Mutex
data map[string]string
}
var gState State
func init() {
gState.data = make(map[string]string)
}
func run() {
if gLogPath != "" {
f, err := os.OpenFile(gLogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0o600)
if err != nil {
log.Fatalf("failed to open log file: %s", err)
}
defer f.Close()
log.SetOutput(f)
} else {
log.SetOutput(io.Discard)
}
log.Printf("*************** starting client, PID: %d ***************", gClientID)
var screen tcell.Screen
var err error
if screen, err = tcell.NewScreen(); err != nil {
log.Fatalf("creating screen: %s", err)
} else if err = screen.Init(); err != nil {
log.Fatalf("initializing screen: %s", err)
}
if gOpts.mouse {
screen.EnableMouse()
}
screen.EnablePaste()
ui := newUI(screen)
nav := newNav(ui)
app := newApp(ui, nav)
if err := nav.sync(); err != nil {
app.ui.echoerrf("sync: %s", err)
}
if err := app.readHistory(); err != nil {
app.ui.echoerrf("reading history file: %s", err)
}
app.loop()
app.ui.screen.Fini()
if gLastDirPath != "" {
writeLastDir(gLastDirPath, app.nav.currDir().path)
}
if gSelectionPath != "" && len(app.selectionOut) > 0 {
writeSelection(gSelectionPath, app.selectionOut)
}
if gPrintLastDir || gPrintSelection {
stdoutIsTerminal := term.IsTerminal(int(os.Stdout.Fd()))
if gPrintLastDir {
printPath("last-dir", app.nav.currDir().path, stdoutIsTerminal)
}
if gPrintSelection {
for _, file := range app.selectionOut {
printPath("selection", file, stdoutIsTerminal)
}
}
}
}
// printPath prints path for -print-last-dir / -print-selection. Newlines are
// rejected unconditionally (frame integrity for line-oriented consumers);
// control bytes are stripped only when stdout is a terminal.
func printPath(label, path string, stdoutIsTerminal bool) {
if strings.ContainsAny(path, "\n\r") {
log.Printf("%s: skipping path with newline: %q", label, path)
return
}
if stdoutIsTerminal {
path = sanitizeName(path)
}
fmt.Println(path)
}
func writeLastDir(filename, lastDir string) {
if strings.ContainsAny(lastDir, "\n\r") {
log.Printf("last-dir: path contains newline: %q", lastDir)
return
}
f, err := os.Create(filename)
if err != nil {
log.Printf("opening last dir file: %s", err)
return
}
defer f.Close()
_, err = f.WriteString(lastDir)
if err != nil {
log.Printf("writing last dir file: %s", err)
}
}
func writeSelection(filename string, selection []string) {
f, err := os.Create(filename)
if err != nil {
log.Printf("opening selection file: %s", err)
return
}
defer f.Close()
filtered := slices.DeleteFunc(slices.Clone(selection), func(s string) bool {
if strings.ContainsAny(s, "\n\r") {
log.Printf("selection: skipping path with newline: %q", s)
return true
}
return false
})
_, err = f.WriteString(strings.Join(filtered, "\n"))
if err != nil {
log.Printf("writing selection file: %s", err)
}
}
func readExpr() <-chan expr {
ch := make(chan expr)
go func() {
duration := 100 * time.Millisecond
c, err := net.Dial("unix", gSocketPath)
for err != nil {
log.Printf("connecting server: %s", err)
time.Sleep(duration)
duration *= 2
c, err = net.Dial("unix", gSocketPath)
}
if _, err := fmt.Fprintf(c, "conn %d\n", gClientID); err != nil {
log.Printf("registering with server: %s", err)
return
}
ch <- &callExpr{"sync", nil, 1}
ch <- &callExpr{"on-init", nil, 1}
s := bufio.NewScanner(c)
for s.Scan() {
log.Printf("recv: %s", s.Text())
// `query` has to be handled outside of the main thread, which is
// blocked when running a synchronous shell command ("$" or "!").
// This is important since `query` is often the result of the user
// running `$lf -remote "query $id <something>"`.
if word, rest := splitWord(s.Text()); word == "query" {
gState.mutex.Lock()
state := gState.data[rest]
gState.mutex.Unlock()
if _, err := fmt.Fprintln(c, state); err != nil {
log.Printf("sending response to server: %s", err)
return
}
} else {
p := newParser(strings.NewReader(s.Text()))
if p.parse() {
ch <- p.expr
}
}
}
if err := s.Err(); err != nil {
log.Printf("reading from server: %s", err)
}
c.Close()
}()
return ch
}
func remote(req string) (string, error) {
c, err := net.Dial("unix", gSocketPath)
if err != nil {
return "", fmt.Errorf("connecting to server: %w", err)
}
defer c.Close()
if _, err := fmt.Fprintln(c, req); err != nil {
return "", fmt.Errorf("sending command to server: %w", err)
}
// XXX: Standard net.Conn interface does not include a CloseWrite method
// but net.UnixConn and net.TCPConn implement it so the following should be
// safe as long as we do not use other types of connections. We need
// CloseWrite to notify the server that this is not a persistent connection
// and it should be closed after the response.
switch c := c.(type) {
case *net.TCPConn:
c.CloseWrite()
case *net.UnixConn:
c.CloseWrite()
}
resp, err := io.ReadAll(c)
if err != nil {
return "", fmt.Errorf("reading response from server: %w", err)
}
return string(resp), nil
}