98 lines
2 KiB
Go
98 lines
2 KiB
Go
package main
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import (
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"encoding/json"
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"io/ioutil"
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"log"
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"os/exec"
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"time"
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)
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func write(history []string, histfile string) error {
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histlog, err := json.Marshal(history)
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(histfile, histlog, 0644)
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return err
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}
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func filter(history []string, text string) []string {
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var (
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found bool
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idx int
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)
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for i, el := range history {
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if el == text {
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found = true
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idx = i
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break
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}
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}
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if found {
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// we know that idx can't be the last element, because
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// we never get to call this function if that's the case
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history = append(history[:idx], history[idx+1:]...)
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}
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return history
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}
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func listen(history []string, histfile string, persist bool, max int) {
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for {
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t, err := exec.Command("wl-paste", "-n", "-t", "text").CombinedOutput()
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if err != nil {
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// wl-paste exits 1 if there's no selection (e.g., when running it at OS startup)
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if string(t) != "No selection\n" {
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log.Printf("Error running wl-paste: %s", t)
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}
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time.Sleep(1 * time.Second)
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continue
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}
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text := string(t)
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if text == "" {
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// there's nothing to select, so we sleep.
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time.Sleep(1 * time.Second)
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continue
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}
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l := len(history)
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if l > 0 {
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// wl-paste will always give back the last copied text
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// (as long as the place we copied from is still running)
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if history[l-1] == text {
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time.Sleep(1 * time.Second)
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continue
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}
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if l >= max {
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// usually just one item, but more if we reduce our --max-items value
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history = history[l-max+1:]
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}
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// remove duplicates
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history = filter(history, text)
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}
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history = append(history, text)
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// dump history to file so that other apps can query it
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if err := write(history, histfile); err != nil {
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log.Fatalf("Fatal error writing history: %s", err)
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}
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if persist {
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// make the copy buffer available to all applications,
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// even when the source has disappeared
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if err := exec.Command("wl-copy", []string{"--", text}...).Run(); err != nil {
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log.Printf("Error running wl-copy: %s", err)
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}
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}
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}
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}
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