added jupyter-calculator

i3/jupyter-calculator

@@ -0,0 +1,71 @@
+#!/bin/python3
+
+import subprocess 
+import time
+import psutil
+
+NOTEBOOK_DIR = "/home/julian/jupyter-notebooks/"
+PORT = "8988"
+
+def isOtherProcessRunning():
+    process_count = 0
+    for proc in psutil.process_iter():
+       try:
+           pinfo = proc.as_dict(attrs=['pid', 'name', 'create_time'])
+           if "jupyter-calc" in pinfo['name'].lower():
+               process_count += 1
+       except (psutil.NoSuchProcess, psutil.AccessDenied , psutil.ZombieProcess) :
+           pass
+    return process_count > 1
+
+def getNotebookPort(line):
+    url = line.split(" :: ")[0]
+    return url.split("localhost:")[1].split("/")[0]
+
+def getNotebookToken(line):
+    url = line.split(" :: ")[0]
+    return url.split("token=")[1]
+
+
+def isNotebookRunning():
+    answer = subprocess.check_output("jupyter notebook list", shell=True)
+    lines = answer.decode("utf-8").split("\n")
+    if lines[0] != "Currently running servers:":
+        raise Exception("Invalid jupyter status message")
+
+    for i in range(1, len(lines) -1):
+        if getNotebookPort(lines[i]) == PORT:
+            return getNotebookToken(lines[i]) 
+    return None 
+
+if __name__ == "__main__":
+    try:
+        if not isNotebookRunning():
+            subprocess.Popen(f"jupyter notebook --notebook-dir={NOTEBOOK_DIR} --port={PORT} --no-browser", shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+
+        max_wait_seconds = 3 
+        delta_t_seconds = 0.1
+
+        current_wait_seconds = 0
+
+        token = ""
+        while True:
+            token = isNotebookRunning()
+            if token:
+                break
+
+            time.sleep(delta_t_seconds)
+            current_wait_seconds += delta_t_seconds
+            if current_wait_seconds >= max_wait_seconds:
+                raise Exception(f"Maximum wait time of {max_wait_seconds} exceeded!")
+
+        subprocess.call(f"cp {NOTEBOOK_DIR}calculator_template.ipynb {NOTEBOOK_DIR}calculator.ipynb", shell=True, stdout=None)
+        subprocess.call(f"electron 'http://localhost:{PORT}/notebooks/calculator.ipynb?token={token}'", shell=True, stdout=None)
+
+    finally:
+        # TODO: not reliably working
+        if not isOtherProcessRunning():
+            try:
+                subprocess.run(f"jupyter notebook stop {PORT}", shell=True)
+            except Exception:
+                pass