From 65efb9c8546b4b646e98ed97c567a2d546265dfb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maximilian=20Ke=C3=9Fler?= <max@maximilian-kessler.de>
Date: Fri, 1 Oct 2021 19:08:56 +0200
Subject: [PATCH] add FileHandle class for lists of pdf files (e.g. exercise
 sheets)

---
 scripts/file_list.py                      | 36 +++++++++++++++++++++++
 scripts/{edit.py => window_subprocess.py} |  9 ++++++
 2 files changed, 45 insertions(+)
 create mode 100644 scripts/file_list.py
 rename scripts/{edit.py => window_subprocess.py} (63%)

diff --git a/scripts/file_list.py b/scripts/file_list.py
new file mode 100644
index 0000000..0b93a1e
--- /dev/null
+++ b/scripts/file_list.py
@@ -0,0 +1,36 @@
+#!/usr/bin/python3
+import re
+import subprocess
+import warnings
+from pathlib import Path
+from window_subprocess import open_pdf
+
+
+class FileHandle:
+    def __init__(self, file_path: Path):
+        self.path = file_path
+        match = re.match(r'[\D]*(\d+)[\D]*\.pdf', file_path.name)
+        if match is None:
+            warnings.warn(f'Invalid format in file {str(file_path)}: Could not parse number.')
+            self.number = -1
+        else:
+            self.number = int(match.group(1))
+    
+    def open(self):
+        open_pdf(self.path)
+
+
+class Files(list):
+    def __init__(self, root_path: Path, pattern: str = "*"):
+        self.root: Path = root_path
+        list.__init__(self, self.read_files(pattern))
+
+    def read_files(self, pattern):
+        files = self.root.glob(pattern)
+        return sorted((FileHandle(f) for f in files), key=lambda f: f.number)
+
+    def unite_files(self, name):
+        result = subprocess.run(
+            ['pdfunite'] + list(map(lambda f: str(f.path), self)) + [str(self.root / name)]
+        )
+        print(result.stdout)
diff --git a/scripts/edit.py b/scripts/window_subprocess.py
similarity index 63%
rename from scripts/edit.py
rename to scripts/window_subprocess.py
index 87fd440..034891d 100644
--- a/scripts/edit.py
+++ b/scripts/window_subprocess.py
@@ -13,3 +13,12 @@ def edit(filepath: Path, rootpath: Path = None, env=os.environ):
         "-e",
         f"vim --servername tex-vorlesung --remote-silent {str(filepath)}"
     ], env=env, cwd=str(rootpath))
+
+
+def open_pdf(filepath: Path):
+    result = subprocess.run(
+        ['zathura', str(filepath)],
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL
+    )
+    return result.returncode