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README.md

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+# Clipman
+
+A basic clipboard manager for Wayland.
+
+## Requirements
+
+- a windows manager that uses `wlr-data-control`, like Sway and other wlroots-bases WMs.
+- wl-clipboard from latest master (NOT v1.0)
+- dmenu
+
+## Usage
+
+The demon that collects history is written in Go. Install it in your path, then run it in your Sway session by adding `exec clipman` at the beginning of your config.
+
+You can configure how many history items to preserve (default: 15) by editing directly the source.
+
+To query the history and select items, run the provided python script (`clipman.py`). You can assign it to a keybinding.

clipman.py

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+#!/usr/bin/python
+import json
+import os
+import subprocess
+import sys
+
+MAX = 15
+
+
+def selector(input_, max_):
+    """Send list to dmenu for selection. Display max items."""
+    cmd = [
+        "dmenu",
+        "-b",
+        "-fn",
+        "-misc-dejavu sans mono-medium-r-normal--17-120-100-100-m-0-iso8859-16",
+        "-l",
+        str(max_),
+    ]
+    chosen = (
+        subprocess.run(
+            cmd, input="\n".join(input_).encode("utf-8"), capture_output=True
+        )
+        .stdout.decode()
+        .strip()
+    )
+    return chosen
+
+
+def main():
+    try:
+        with open(os.path.expanduser("~/.local/share/clipman.json")) as f:
+            history = json.load(f)
+    except FileNotFoundError:
+        sys.exit("No history available")
+
+    history = [repr(x) for x in reversed(history)]  # don't expand newlines
+
+    selected = selector(history, MAX)
+
+    subprocess.run(["wl-copy", selected])
+
+
+if __name__ == "__main__":
+    main()

go.mod

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+module clipman
+
+go 1.12

main.go

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+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path"
+	"time"
+)
+
+const max = 15
+const sleep = 1 * time.Second
+
+func write(history []string, histf string) error {
+	histlog, err := json.Marshal(history)
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile(histf, histlog, 0644)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func filter(history []string, text string) []string {
+	var (
+		found bool
+		idx   int
+	)
+
+	for i, el := range history {
+		if el == text {
+			found = true
+			idx = i
+			break
+		}
+	}
+
+	if found {
+		// we know that idx can't be the last element, because
+		// we never get to call this function if that's the case
+		history = append(history[:idx], history[idx+1:]...)
+	}
+
+	return history
+}
+
+func main() {
+	h, err := os.UserHomeDir()
+	if err != nil {
+		log.Fatal(err)
+	}
+	histf := path.Join(h, ".local/share/clipman.json")
+
+	var history []string
+	b, err := ioutil.ReadFile(histf)
+	if err == nil {
+		if err := json.Unmarshal(b, &history); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	for {
+		t, err := exec.Command("wl-paste", []string{"-n", "-t", "text"}...).Output()
+		text := string(t)
+		if err != nil || text == "" {
+			// there's nothing to select, so we sleep.
+			time.Sleep(sleep)
+			continue
+		}
+
+		l := len(history)
+
+		// wl-paste will always give back the last copied text
+		// (as long as the place we copied from is still running)
+		if history[l-1] == text {
+			time.Sleep(sleep)
+			continue
+		}
+
+		if l == max {
+			// we know that at any given time len(history) cannot be bigger than max,
+			// so it's enough to drop the first element
+			history = history[1:]
+		}
+
+		// remove duplicates
+		history = filter(history, text)
+
+		history = append(history, text)
+
+		// dump history to file so that other apps can query it
+		err = write(history, histf)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		time.Sleep(sleep)
+	}
+}