edd - line-based text editor

edd is my attempt at writing the ed text-editor from scratch. Initially, I was planning to only write a subset of ed, but ended up writing it in its entirety. I decided it would be nice to have some extra features like:

• Unlimited undos and redos.
• Hot swappable prompt string.

Future features:

• Line editing with readline or linenoise.
• "edit current line"

edd shares its syntax and idiosyncracies (to some extent) with ed. The ed manual (or man ed) sufficiently describes and explains how ed and, by extension, edd, works.

Differences and edd'isms

1. There are no special commands (h and H) for "Error Explanations," errors are succintly explained as they occur.

2. Syntax is liberal. For example, s/RE/SUBS/FLAG is legal in ed but s /RE/SUBS/FLAG is not. In edd, however, this is allowed. edd allows any number of space (or tabs) between commands and their arguments.

3. Command l has been omitted.

4. Command U does redos.

5. Like ed, recursively calling any global command (g,G,v,V) is prohibited. This, however, does not prevent the parent global command to execute all the legal commands that come before it. For example,

	g/RE/a \
	line 1\
	line 2\
	.\
	g/RE/

will append "line 1" and "line 2" but signal an error for illegal command in the command list once it encounters 'g'.

6. edd does not support all command line options that ed does. edd -h lists available options.

7. Like ed, the prompt string can be set with the -p option. And while the program is running, can be changed with the P command. P arg sets the current prompt to arg. "Hot swappable prompt string" is a fancy description of this feature.

Install

git clone https://github.com/bojle/edd.git
cd edd
make
sudo make install
make clean

Uninstall

cd dir/where/you/installed/edd
make unistall

Todo

1. Add features mentioned in the future features section.
2. Thorough testing.

Reporting Bugs

Report bugs at https://github.com/bojle/edd/issues.

Any improvement ideas are welcome.