femto

A minimal text editor written for fun in plain Ruby with no dependencies.

I wrote it from memory after watching the relevant screencast by Gary Bernhardt. It supports:

• Quitting
• Moving the cursor up/down/right/left
• Deleting the character before the cursor, like backspace
• Breaking a line (Enter)
• Undoing!

Additional functionality

The following are also implemented (not covered in the screencast):

• Flicker-free screen
• Ignoring non-printable characters
• Creating a file if it doesn't exist (not just editing)
• Saving
• Redoing!
• Moving left at the beginning of a line causes the cursor to jump to the end of the previous line
• Moving right at the end of a line causes the cursor to jump to the beginning of the next line
• Moving the cursor to the beginning of the line
• Moving the cursor to the end of the line
• Deleting the character before the cursor at the beginning of a line joins lines
• Deleting the character at the cursor, like delete
• Deleting the character at the cursor when at the end of a line joins lines
• Deleting the line text before the cursor
• Deleting the line text after (and including) the cursor
• Support for arrow, Backspace, Delete, Home and End keys

Usage

./femto.rb myfile.txt

Keyboard shortcuts

• Ctrl-Q quits
• Ctrl-S saves
• Ctrl-P (previous), or the Up arrow key, moves the cursor up
• Ctrl-N (next), or the Down arrow key, moves the cursor down
• Ctrl-F (forward), or the Right arrow key, moves the cursor right
• Ctrl-B (backward), or the Left arrow key, moves the cursor left
• Ctrl-A or Home moves the cursor to the beginning of the line
• Ctrl-E or End moves the cursor to the end of the line
• Ctrl-H or Backspace deletes the previous character
• Ctrl-D or Delete deletes the current character
• Ctrl-U deletes the line text before the cursor
• Ctrl-K deletes the line text after (and including) the cursor
• Ctrl-- undoes the last change
• Ctrl-R redoes the last change

Roadmap

• Tests
• Scroll-buffer

Disclaimer

This is an experimental program. Do NOT use it to edit files that you don't want to lose/damage.

License

The Unlicense

Author

Angelos Orfanakos, https://agorf.gr/