Add --tmux option to replace fzf-tmux script

src/tmux.go

@@ -0,0 +1,149 @@
+package fzf
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/junegunn/fzf/src/tui"
+	"github.com/junegunn/fzf/src/util"
+)
+
+func escapeSingleQuote(str string) string {
+	return "'" + strings.ReplaceAll(str, "'", "'\\''") + "'"
+}
+
+func runTmux(args []string, opts *Options) (int, error) {
+	ns := time.Now().UnixNano()
+
+	output := filepath.Join(os.TempDir(), fmt.Sprintf("fzf-tmux-output-%d", ns))
+	if err := mkfifo(output, 0666); err != nil {
+		return ExitError, err
+	}
+	defer os.Remove(output)
+
+	// Find fzf executable
+	fzf := "fzf"
+	if found, err := os.Executable(); err == nil {
+		fzf = found
+	}
+
+	// Prepare arguments
+	args = append([]string{"--bind=ctrl-z:ignore"}, args...)
+	if opts.BorderShape == tui.BorderUndefined {
+		args = append(args, "--border")
+	}
+	args = append(args, "--no-height")
+	args = append(args, "--no-tmux")
+	argStr := ""
+	for _, arg := range args {
+		// %q formatting escapes $'foo\nbar' to "foo\nbar"
+		argStr += " " + escapeSingleQuote(arg)
+	}
+
+	// Build command
+	var command string
+	if opts.Input == nil && util.IsTty() {
+		command = fmt.Sprintf(`%q%s > %q`, fzf, argStr, output)
+	} else {
+		input := filepath.Join(os.TempDir(), fmt.Sprintf("fzf-tmux-input-%d", ns))
+		if err := mkfifo(input, 0644); err != nil {
+			return ExitError, err
+		}
+		defer os.Remove(input)
+
+		go func() {
+			inputFile, err := os.OpenFile(input, os.O_WRONLY, 0)
+			if err != nil {
+				return
+			}
+			if opts.Input == nil {
+				io.Copy(inputFile, os.Stdin)
+			} else {
+				for item := range opts.Input {
+					fmt.Fprint(inputFile, item+opts.PrintSep)
+				}
+			}
+			inputFile.Close()
+		}()
+
+		command = fmt.Sprintf(`%q%s < %q > %q`, fzf, argStr, input, output)
+	}
+
+	// Get current directory
+	dir, err := os.Getwd()
+	if err != nil {
+		dir = "."
+	}
+
+	// Set tmux options for popup placement
+	// C        Both    The centre of the terminal
+	// R        -x      The right side of the terminal
+	// P        Both    The bottom left of the pane
+	// M        Both    The mouse position
+	// W        Both    The window position on the status line
+	// S        -y      The line above or below the status line
+	tmuxArgs := []string{"display-popup", "-E", "-B", "-d", dir}
+	switch opts.Tmux.position {
+	case posUp:
+		tmuxArgs = append(tmuxArgs, "-xC", "-y0")
+	case posDown:
+		tmuxArgs = append(tmuxArgs, "-xC", "-yS")
+	case posLeft:
+		tmuxArgs = append(tmuxArgs, "-x0", "-yC")
+	case posRight:
+		tmuxArgs = append(tmuxArgs, "-xR", "-yC")
+	case posCenter:
+		tmuxArgs = append(tmuxArgs, "-xC", "-yC")
+	}
+	tmuxArgs = append(tmuxArgs, "-w"+opts.Tmux.width.String())
+	tmuxArgs = append(tmuxArgs, "-h"+opts.Tmux.height.String())
+
+	// To ensure that the options are processed by a POSIX-compliant shell,
+	// we need to write the command to a temporary file and execute it with sh.
+	exports := os.Environ()
+	for idx, pairStr := range exports {
+		pair := strings.SplitN(pairStr, "=", 2)
+		exports[idx] = fmt.Sprintf("export %s=%s", pair[0], escapeSingleQuote(pair[1]))
+	}
+	temp := writeTemporaryFile(append(exports, command), "\n")
+	defer os.Remove(temp)
+	tmuxArgs = append(tmuxArgs, "sh", temp)
+
+	// Take the output
+	go func() {
+		outputFile, err := os.OpenFile(output, os.O_RDONLY, 0)
+		if err != nil {
+			return
+		}
+		if opts.Output == nil {
+			io.Copy(os.Stdout, outputFile)
+		} else {
+			reader := bufio.NewReader(outputFile)
+			sep := opts.PrintSep[0]
+			for {
+				item, err := reader.ReadString(sep)
+				if err != nil {
+					break
+				}
+				opts.Output <- item
+			}
+		}
+
+		outputFile.Close()
+	}()
+
+	cmd := exec.Command("tmux", tmuxArgs...)
+	if err := cmd.Run(); err != nil {
+		if exitError, ok := err.(*exec.ExitError); ok {
+			return exitError.ExitCode(), err
+		}
+	}
+
+	return ExitOk, nil
+}