jrnl reads extraneous text files when reading folder journal

[micahellison]

Diagnostic output

jrnl: v3.3
Python: 3.11.1 (tags/v3.11.1:a7a450f, Dec  6 2022, 19:58:39) [MSC v.1934 64 bit (AMD64)]
OS: Windows 10

Current Behavior

When opening a folder journal (a journal whose path is a folder, not a file, as in FolderJournal.py), jrnl traverses through ALL txt files in the journal, whether or not they match the naming format we use (get_files method) and parses all of them as journal entries (open method).

This can lead to really strange behavior. If I have a text file like "readme.txt" in my jrnl, it suddenly becomes a jrnl entry.

It can also lead to jrnl crashing, if it can't parse the text files. See #1665 for a support case where that happens.

Expected Behavior

jrnl should only parse text files that are saved in its file naming format.

Repro Steps

I create a new dirtest jrnl in my jrnl.yaml config file:

  dirtest:
    journal: C:\temp\testing\dirtest\

I create a readme.txt file in that folder with the contents:

This is a readme

I run jrnl dirtest -1 and I get this output, but I wouldn't expect to see it:

2023-02-25 12:45:37 PM This is a readme

Debug output

DEBUG    root         Parsed args: Namespace(debug=True, preconfig_cmd=None, postconfig_cmd=None, filename=None, on_date=None, today_in_history=False, month=None, day=None, year=None, start_date=None, end_date=None, contains=None, strict=False, starred=False, limit=5, excluded=[], edit=False, delete=False, change_time=None, export=False, tags=False, short=False, config_override=[], config_file_path='', text=['dirtest'])
DEBUG    root         Reading configuration from file C:\Users\micah\.config\jrnl\jrnl.yaml
DEBUG    root         Using configuration "{'colors': {'body': 'none', 'date': 'black', 'tags': 'yellow', 'title': 'cyan'}, 'default_hour': 9, 'default_minute': 0, 'display_format': None, 'editor': 'subl -w', 'encrypt': False, 'highlight': True, 'indent_character': '', 'journals': {'dirtest': {'journal': 'C:\\temp\\testing\\dirtest\\'}}, 'linewrap': 'auto', 'tagsymbols': '#@', 'template': False, 'timeformat': '%F %r', 'version': 'v3.3'}"
DEBUG    root         Using journal name: dirtest
DEBUG    root         Updating configuration with specific journal overrides {'journal': 'C:\\temp\\testing\\dirtest\\'}
2023-02-25 12:47:51 PM This is a readme

Other Information

No response