init: initial helix notebook setup

.envrc

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+use flake

.gitignore

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+.direnv

.helix/config.toml

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+[keys.normal]
+"C-r" = [":write", ":sh kitty @ send-text --match cmdline:python '%%run \"%{buffer_name}\"\n'"]
+"C-a" = [":write", ":sh python .state_manager.py \"%{buffer_name}\"", "select_all", "delete_selection"]

.state_manager.py

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+from pathlib import Path
+from sys import argv
+state = Path(".state")
+
+if len(argv) < 2:
+    exit()
+
+cell_path = Path(argv[1])
+
+state_bytes = 0
+
+if state.exists():
+    state_bytes = state.read_bytes()
+    state_bytes = int.from_bytes(state_bytes) + 1
+state.write_bytes(state_bytes.to_bytes())
+
+save_path = cell_path.with_stem(cell_path.stem + '_' + str(state_bytes))
+cell_path.rename(save_path)
+