73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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)
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func store(text string, history []string, histfile string, max int, persist bool) error {
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if text == "" {
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return nil
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}
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l := len(history)
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if l > 0 {
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// this avoids entering an endless loop,
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// see https://github.com/bugaevc/wl-clipboard/issues/65
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last := history[l-1]
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if text == last {
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return nil
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}
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// drop oldest items that exceed max list size
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// if max = 0, we allow infinite history; NOTE: users should NOT rely on this behaviour as we might change it without notice
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if max != 0 && l >= max {
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// usually just one item, but more if we suddenly reduce our --max-items
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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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return fmt.Errorf("error writing history: %s", err)
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}
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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 persist {
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if err := serveTxt(text); err != nil {
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log.Print(err) // don't abort, minor error
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}
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}
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return nil
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}
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// filter removes all occurrences of text
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func filter(slice []string, text string) []string {
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var filtered []string
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for _, s := range slice {
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if s != text {
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filtered = append(filtered, s)
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}
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}
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return filtered
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}
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// write dumps history to json file
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func write(history []string, histfile string) error {
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b, 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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return ioutil.WriteFile(histfile, b, 0644)
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}
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