femto

A very basic text editor written for educational purposes in plain Ruby with no dependencies.

It was written from memory after watching the relevant screencast by Gary Bernhardt and supports:

Additionally, the following "features" have been implemented:

Flicker-free screen
Creating a file if it doesn't exist (not just editing)
Ignoring non-printable characters
Saving (Ctrl-S)
Moving left (Ctrl-B) at the beginning of a line causes the cursor to jump to the end of the previous line
Moving right (Ctrl-F) 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 (Ctrl-A)
Moving the cursor to the end of the line (Ctrl-E)
Deleting the character before the cursor (Ctrl-H) at the beginning of a line joins lines
Deleting the character at the cursor, like delete (Ctrl-D)
Deleting the character at the cursor (Ctrl-D) when at the end of a line joins lines
Deleting the line text before the cursor (Ctrl-U)
Deleting the line text after (and including) the cursor (Ctrl-K)

Usage

./femto.rb myfile.txt

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

Angelos Orfanakos, https://agorf.gr/