BookOwl wrote:

@gtoal, do you have any tips for how to implement undo/redo?

BookOwl wrote:

@gtoal, do you have any tips for how to implement undo/redo?

gtoal wrote:

BookOwl wrote:

@gtoal, do you have any tips for how to implement undo/redo?

Well, in *my* system, where every edit can be represented by a textual edit command, I keep a log of commands executed so far, and then replay that against the original file - so an undo would be to replay all but the last <n> commands.

An alternative would be to log the commands which would undo the changes, so if you deleted a character, you would record a command which would insert that character, then to undo you would execute those re-instatement commands in reverse order. this would be like storing the output of the diff command between versions, and undoing by running the ‘patch’ command.

An alternative I've seen is keeping a stack of deletions and having an edit key that pops items off the ‘deleted’ stack. That one was only saving whole lines, not single characters. (there was a ‘delete line’ key) That was more an ‘undelete’ than an ‘undo’ and was also the mechanism which that editor used for moving blocks of text around in the file. (delete, then move, then undelete)

NickyNouse wrote:

gtoal wrote:

BookOwl wrote:

@gtoal, do you have any tips for how to implement undo/redo?

Well, in *my* system, where every edit can be represented by a textual edit command, I keep a log of commands executed so far, and then replay that against the original file - so an undo would be to replay all but the last <n> commands.

An alternative would be to log the commands which would undo the changes, so if you deleted a character, you would record a command which would insert that character, then to undo you would execute those re-instatement commands in reverse order. this would be like storing the output of the diff command between versions, and undoing by running the ‘patch’ command.

An alternative I've seen is keeping a stack of deletions and having an edit key that pops items off the ‘deleted’ stack. That one was only saving whole lines, not single characters. (there was a ‘delete line’ key) That was more an ‘undelete’ than an ‘undo’ and was also the mechanism which that editor used for moving blocks of text around in the file. (delete, then move, then undelete)

Ooh I like that answer. It sounds like an easier solution than writing an inverse function for every possible command, and it makes for less frequent “snapshots” then the previous answer. You could even find ways to consolidate commands (for example, if the cursor doesn't change position between a series of “character entered” commands you could combine them into one “paste” command

bobbybee wrote:

NickyNouse wrote:

gtoal wrote:

BookOwl wrote:

@gtoal, do you have any tips for how to implement undo/redo?

Well, in *my* system, where every edit can be represented by a textual edit command, I keep a log of commands executed so far, and then replay that against the original file - so an undo would be to replay all but the last <n> commands.

An alternative would be to log the commands which would undo the changes, so if you deleted a character, you would record a command which would insert that character, then to undo you would execute those re-instatement commands in reverse order. this would be like storing the output of the diff command between versions, and undoing by running the ‘patch’ command.

An alternative I've seen is keeping a stack of deletions and having an edit key that pops items off the ‘deleted’ stack. That one was only saving whole lines, not single characters. (there was a ‘delete line’ key) That was more an ‘undelete’ than an ‘undo’ and was also the mechanism which that editor used for moving blocks of text around in the file. (delete, then move, then undelete)

Ooh I like that answer. It sounds like an easier solution than writing an inverse function for every possible command, and it makes for less frequent “snapshots” then the previous answer. You could even find ways to consolidate commands (for example, if the cursor doesn't change position between a series of “character entered” commands you could combine them into one “paste” command

You could always derive inverse functions… maybe.

WooHooBoy wrote:

I've been thinking about how I want my text editor to work - I'd like it to be a small base but very extensible with plugins. In theory I'd like more than just the basic functionality to be written in plugins that are installed by default.

The problem is Rust is a compiled, statically linked language and I'm not quite sure how to go about plugins

BookOwl wrote:

WooHooBoy wrote:

I've been thinking about how I want my text editor to work - I'd like it to be a small base but very extensible with plugins. In theory I'd like more than just the basic functionality to be written in plugins that are installed by default.

The problem is Rust is a compiled, statically linked language and I'm not quite sure how to go about plugins

You could have people write plugins in Rhai, and then load the plugins in Rust.

BKFighter wrote:

I know this is going to be the dumbest entry here but this fits all my needs basically.

data:text/html,<h1>The BKFighter Simple Text Editor</h1><input style="height:100%;width:100%"></input>

Paste into URL to use
Features
-You can type in it
-Highly customizable
-If your school blocks the URL you just need to change a few characters to unblock it.

Honestly I'm that guy that doesn't care what the editor looks like or does, but I'd still be interested to see some other people's examples.

javascript:document.getElementsByTagName('html')[0].innerHTML = '<h1>The BKFighter Simple Text Editor</h1><input style="height:100%&width:100%"></input>';

javascript:

IcyCoder wrote:

I made a new challenge based on this if you are interested here.

gtoal wrote:

IcyCoder wrote:

I made a new challenge based on this if you are interested here.

Rather than writing a programming language, why don't you use the same skills for writing an editing language? (Which was the original point of this thread, though I haven't seen anyone's editor yet that's beyond the type & insert stage…)

G

herohamp wrote:

Thanks… Now I feel pressured to try again