99 lines
2 KiB
Go
99 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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"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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if err != nil {
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return err
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}
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return nil
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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) error {
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for {
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t, err := exec.Command("wl-paste", []string{"-n", "-t", "text"}...).Output()
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text := string(t)
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if err != nil || 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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// we know that at any given time len(history) cannot be bigger than max,
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// so it's enough to drop the first element
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history = history[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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err = write(history, histfile)
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if err != nil {
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return 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", text).Run(); err != nil {
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return err
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}
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}
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// writing to json is time consuming, so it's fine to sleep less and
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// get ready to detect new events sooner.
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// also because if we copied once, we might copy soon after.
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time.Sleep(250 * time.Millisecond)
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}
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}
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