93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"os"
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"os/exec"
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"strconv"
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"strings"
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)
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func selector(data []string, max int, tool string) (string, error) {
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if len(data) == 0 {
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return "", errors.New("No history available")
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}
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// output to stdout and return
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if tool == "-" {
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escaped, _ := preprocessData(data, false)
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os.Stdout.WriteString(strings.Join(escaped, "\n"))
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return "", nil
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}
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bin, err := exec.LookPath(tool)
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if err != nil {
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return "", fmt.Errorf("%s is not installed", tool)
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}
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var args []string
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switch tool {
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case "dmenu":
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args = []string{"dmenu", "-b",
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"-fn",
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"-misc-dejavu sans mono-medium-r-normal--17-120-100-100-m-0-iso8859-16",
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"-l",
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strconv.Itoa(max)}
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case "rofi":
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args = []string{"rofi", "-dmenu",
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"-lines",
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strconv.Itoa(max)}
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default:
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return "", fmt.Errorf("Unsupported tool: %s", tool)
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}
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processed, guide := preprocessData(data, true)
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cmd := exec.Cmd{Path: bin, Args: args, Stdin: strings.NewReader(strings.Join(processed, "\n"))}
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b, err := cmd.CombinedOutput()
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if err != nil {
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if err.Error() == "exit status 1" {
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// dmenu/rofi exits with this error when no selection done
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return "", nil
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}
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return "", err
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}
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selected := string(b[:len(b)-1]) // drop newline added by dmenu/rofi
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sel, ok := guide[selected]
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if !ok {
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return "", errors.New("couldn't recover original string")
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}
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return sel, nil
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}
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// preprocessData:
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// - reverses the data
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// - escapes special characters (like newlines) that would break external selectors;
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// - optionally it cuts items longer than 400 bytes (dmenu doesn't allow more than ~1200).
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// A guide is created to allow restoring the selected item.
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func preprocessData(data []string, cutting bool) ([]string, map[string]string) {
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var escaped []string
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guide := make(map[string]string)
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for i := len(data) - 1; i >= 0; i-- { // reverse slice
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original := data[i]
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repr := fmt.Sprintf("%#v", original)
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size := len(repr) - 1
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if cutting {
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const maxChars = 400
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if size > maxChars {
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size = maxChars
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}
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}
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repr = repr[1:size] // drop left and right quotes
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guide[repr] = original
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escaped = append(escaped, repr)
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}
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return escaped, guide
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}
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