487 lines
9.8 KiB
Go
487 lines
9.8 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"log"
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"os"
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"os/exec"
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"os/signal"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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"github.com/gdamore/tcell/v2"
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)
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type cmdItem struct {
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prefix string
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value string
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}
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type app struct {
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ui *ui
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nav *nav
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ticker *time.Ticker
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quitChan chan struct{}
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cmd *exec.Cmd
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cmdIn io.WriteCloser
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cmdOutBuf []byte
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cmdHistory []cmdItem
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cmdHistoryBeg int
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cmdHistoryInd int
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}
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func newApp(screen tcell.Screen) *app {
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ui := newUI(screen)
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nav := newNav(ui.wins[0].h)
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quitChan := make(chan struct{}, 1)
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app := &app{
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ui: ui,
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nav: nav,
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ticker: new(time.Ticker),
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quitChan: quitChan,
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}
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan, os.Interrupt, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM)
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go func() {
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switch <-sigChan {
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case os.Interrupt:
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return
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case syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM:
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app.writeHistory()
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os.Remove(gLogPath)
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os.Exit(3)
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return
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}
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}()
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return app
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}
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func (app *app) readFile(path string) {
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log.Printf("reading file: %s", path)
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f, err := os.Open(path)
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if err != nil {
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app.ui.echoerrf("opening file: %s", err)
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return
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}
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defer f.Close()
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p := newParser(f)
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for p.parse() {
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p.expr.eval(app, nil)
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}
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if p.err != nil {
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app.ui.echoerrf("%s", p.err)
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}
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}
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func (app *app) readHistory() error {
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f, err := os.Open(gHistoryPath)
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if os.IsNotExist(err) {
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return nil
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}
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if err != nil {
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return fmt.Errorf("opening history file: %s", err)
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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toks := strings.SplitN(scanner.Text(), " ", 2)
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if toks[0] != ":" && toks[0] != "$" && toks[0] != "%" && toks[0] != "!" && toks[0] != "&" {
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continue
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}
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if len(toks) < 2 {
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continue
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}
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app.cmdHistory = append(app.cmdHistory, cmdItem{toks[0], toks[1]})
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}
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app.cmdHistoryBeg = len(app.cmdHistory)
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if err := scanner.Err(); err != nil {
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return fmt.Errorf("reading history file: %s", err)
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}
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return nil
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}
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func (app *app) writeHistory() error {
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if len(app.cmdHistory) == 0 {
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return nil
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}
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local := make([]cmdItem, len(app.cmdHistory)-app.cmdHistoryBeg)
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copy(local, app.cmdHistory[app.cmdHistoryBeg:])
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app.cmdHistory = nil
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if err := app.readHistory(); err != nil {
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return fmt.Errorf("reading history file: %s", err)
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}
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app.cmdHistory = append(app.cmdHistory, local...)
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if err := os.MkdirAll(filepath.Dir(gHistoryPath), os.ModePerm); err != nil {
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return fmt.Errorf("creating data directory: %s", err)
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}
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f, err := os.Create(gHistoryPath)
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if err != nil {
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return fmt.Errorf("creating history file: %s", err)
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}
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defer f.Close()
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if len(app.cmdHistory) > 1000 {
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app.cmdHistory = app.cmdHistory[len(app.cmdHistory)-1000:]
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}
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for _, cmd := range app.cmdHistory {
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_, err = f.WriteString(fmt.Sprintf("%s %s\n", cmd.prefix, cmd.value))
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if err != nil {
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return fmt.Errorf("writing history file: %s", err)
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}
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}
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return nil
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}
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// This is the main event loop of the application. Expressions are read from
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// the client and the server on separate goroutines and sent here over channels
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// for evaluation. Similarly directories and regular files are also read in
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// separate goroutines and sent here for update.
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func (app *app) loop() {
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serverChan := readExpr()
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app.ui.readExpr()
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if gSelect != "" {
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go func() {
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lstat, err := os.Lstat(gSelect)
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if err != nil {
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app.ui.exprChan <- &callExpr{"echoerr", []string{err.Error()}, 1}
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} else if lstat.IsDir() {
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app.ui.exprChan <- &callExpr{"cd", []string{gSelect}, 1}
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} else {
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app.ui.exprChan <- &callExpr{"select", []string{gSelect}, 1}
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}
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}()
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}
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for _, path := range gConfigPaths {
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if _, err := os.Stat(path); !os.IsNotExist(err) {
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app.readFile(path)
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}
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}
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for _, cmd := range gCommands {
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p := newParser(strings.NewReader(cmd))
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for p.parse() {
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p.expr.eval(app, nil)
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}
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if p.err != nil {
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app.ui.echoerrf("%s", p.err)
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}
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}
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for {
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select {
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case <-app.quitChan:
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if app.nav.copyTotal > 0 {
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app.ui.echoerr("quit: copy operation in progress")
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continue
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}
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if app.nav.moveTotal > 0 {
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app.ui.echoerr("quit: move operation in progress")
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continue
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}
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if app.nav.deleteTotal > 0 {
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app.ui.echoerr("quit: delete operation in progress")
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continue
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}
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app.nav.previewChan <- ""
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log.Print("bye!")
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if err := app.writeHistory(); err != nil {
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log.Printf("writing history file: %s", err)
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}
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if gLastDirPath != "" {
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f, err := os.Create(gLastDirPath)
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if err != nil {
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log.Printf("opening last dir file: %s", err)
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}
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defer f.Close()
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_, err = f.WriteString(app.nav.currDir().path)
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if err != nil {
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log.Printf("writing last dir file: %s", err)
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}
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}
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return
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case n := <-app.nav.copyBytesChan:
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app.nav.copyBytes += n
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// n is usually 4096B so update roughly per 4096B x 1024 = 4MB copied
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if app.nav.copyUpdate++; app.nav.copyUpdate >= 1024 {
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app.nav.copyUpdate = 0
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app.ui.draw(app.nav)
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}
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case n := <-app.nav.copyTotalChan:
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app.nav.copyTotal += n
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if n < 0 {
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app.nav.copyBytes += n
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}
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if app.nav.copyTotal == 0 {
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app.nav.copyUpdate = 0
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}
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app.ui.draw(app.nav)
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case n := <-app.nav.moveCountChan:
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app.nav.moveCount += n
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if app.nav.moveUpdate++; app.nav.moveUpdate >= 1000 {
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app.nav.moveUpdate = 0
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app.ui.draw(app.nav)
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}
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case n := <-app.nav.moveTotalChan:
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app.nav.moveTotal += n
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if n < 0 {
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app.nav.moveCount += n
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}
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if app.nav.moveTotal == 0 {
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app.nav.moveUpdate = 0
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}
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app.ui.draw(app.nav)
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case n := <-app.nav.deleteCountChan:
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app.nav.deleteCount += n
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if app.nav.deleteUpdate++; app.nav.deleteUpdate >= 1000 {
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app.nav.deleteUpdate = 0
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app.ui.draw(app.nav)
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}
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case n := <-app.nav.deleteTotalChan:
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app.nav.deleteTotal += n
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if n < 0 {
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app.nav.deleteCount += n
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}
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if app.nav.deleteTotal == 0 {
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app.nav.deleteUpdate = 0
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}
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app.ui.draw(app.nav)
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case d := <-app.nav.dirChan:
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app.nav.checkDir(d)
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prev, ok := app.nav.dirCache[d.path]
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if ok {
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d.ind = prev.ind
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d.sel(prev.name(), app.nav.height)
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}
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app.nav.dirCache[d.path] = d
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for i := range app.nav.dirs {
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if app.nav.dirs[i].path == d.path {
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app.nav.dirs[i] = d
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}
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}
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app.nav.position()
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curr, err := app.nav.currFile()
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if err == nil {
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if d.path == app.nav.currDir().path {
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app.ui.loadFile(app.nav, true)
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}
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if d.path == curr.path {
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app.ui.dirPrev = d
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}
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}
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app.ui.draw(app.nav)
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case r := <-app.nav.regChan:
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app.nav.checkReg(r)
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app.nav.regCache[r.path] = r
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curr, err := app.nav.currFile()
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if err == nil {
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if r.path == curr.path {
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app.ui.regPrev = r
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}
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}
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app.ui.draw(app.nav)
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case ev := <-app.ui.evChan:
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e := app.ui.readEvent(ev)
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if e == nil {
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continue
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}
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e.eval(app, nil)
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loop:
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for {
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select {
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case ev := <-app.ui.evChan:
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e = app.ui.readEvent(ev)
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if e == nil {
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continue
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}
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e.eval(app, nil)
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default:
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break loop
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}
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}
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app.ui.draw(app.nav)
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case e := <-app.ui.exprChan:
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e.eval(app, nil)
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app.ui.draw(app.nav)
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case e := <-serverChan:
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e.eval(app, nil)
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app.ui.draw(app.nav)
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case <-app.ticker.C:
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app.nav.renew()
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app.ui.loadFile(app.nav, false)
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app.ui.draw(app.nav)
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}
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}
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}
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func (app *app) exportFiles() {
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var currFile string
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if curr, err := app.nav.currFile(); err == nil {
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currFile = curr.path
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}
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currSelections := app.nav.currSelections()
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exportFiles(currFile, currSelections)
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}
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func waitKey() error {
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cmd := pauseCommand()
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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if err := cmd.Run(); err != nil {
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return fmt.Errorf("waiting key: %s", err)
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}
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return nil
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}
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// This function is used to run a shell command. Modes are as follows:
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//
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// Prefix Wait Async Stdin Stdout Stderr UI action
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// $ No No Yes Yes Yes Pause and then resume
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// % No No Yes Yes Yes Statline for input/output
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// ! Yes No Yes Yes Yes Pause and then resume
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// & No Yes No No No Do nothing
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func (app *app) runShell(s string, args []string, prefix string) {
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app.exportFiles()
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exportOpts()
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cmd := shellCommand(s, args)
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var out io.Reader
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var err error
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switch prefix {
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case "$", "!":
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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app.nav.previewChan <- ""
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app.ui.pause()
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defer app.ui.resume()
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defer app.nav.renew()
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err = cmd.Run()
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case "%":
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stdin, err := cmd.StdinPipe()
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if err != nil {
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log.Printf("writing stdin: %s", err)
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}
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app.cmdIn = stdin
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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log.Printf("reading stdout: %s", err)
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}
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out = stdout
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cmd.Stderr = cmd.Stdout
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fallthrough
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case "&":
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err = cmd.Start()
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}
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if err != nil {
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app.ui.echoerrf("running shell: %s", err)
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}
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switch prefix {
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case "!":
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if err := waitKey(); err != nil {
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app.ui.echoerrf("waiting key: %s", err)
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}
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}
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app.ui.loadFile(app.nav, true)
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switch prefix {
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case "%":
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app.cmd = cmd
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app.cmdOutBuf = nil
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app.ui.msg = ""
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app.ui.cmdPrefix = ">"
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go func() {
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eol := false
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reader := bufio.NewReader(out)
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for {
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b, err := reader.ReadByte()
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if err == io.EOF {
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break
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}
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if eol {
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eol = false
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app.cmdOutBuf = nil
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}
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app.cmdOutBuf = append(app.cmdOutBuf, b)
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if b == '\n' || b == '\r' {
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eol = true
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}
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if reader.Buffered() > 0 {
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continue
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}
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app.ui.exprChan <- &callExpr{"echo", []string{string(app.cmdOutBuf)}, 1}
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}
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if err := cmd.Wait(); err != nil {
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log.Printf("running shell: %s", err)
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}
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app.cmd = nil
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app.ui.cmdPrefix = ""
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app.ui.exprChan <- &callExpr{"load", nil, 1}
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}()
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case "&":
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go func() {
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if err := cmd.Wait(); err != nil {
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log.Printf("running shell: %s", err)
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}
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}()
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}
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}
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