Don't you hate it when you spend half an hour searching for a command, finally find it and happily press Enter only to realize a couple of seconds later... it's not that one, it's another one you've entered two months ago, the one with the typo.

Ugh. Awful. Ungodly. Unproductive. Your day is ruined… unless you use Sponge.

Sponge quietly runs in the background and keeps your shell history clean from typos, incorrectly used commands and everything you don't want to store due to privacy reasons.

Install with Fisher:

fisher install meaningful-ooo/sponge

• fish 3.2+

Just use your shell as usual and enjoy typos-free history😎

Sponge will automatically filter out all failed commands unless they have been in the history before. The last 2 entries are always available so you can quickly fix a misspelled command.

Sponge won’t filter commands retroactively. If you don’t want previously mistyped commands clogging up your search results, clear the history once after Sponge installation:

history clear

By default Sponge will filter out all commands that don’t have 0 as an exit code. You can tweak which exit codes Sponge considers successful with sponge_successful_exit_codes variable:

set sponge_successful_exit_codes 0 127

If you wish to filter out all failed commands regardless of whether they already have been in the history or not, change sponge_allow_previously_successful variable:

set sponge_allow_previously_successful false

You can use the full power of regular expressions to filter out unwanted commands. Set sponge_regex_patterns variable and everything matched will be kept away from the history. For example, to filter out every command that contains IPv4 address, type:

set sponge_regex_patterns '(?:\d{1,3}\.){3}\d{1,3}'

By default Sponge delays purging of filtered command so you can always access the last 2 history entries. If you want to remove commands immediately or increase the delay, change sponge_delay variable:

set sponge_delay 5

Sometimes you want to ignore sponge_delay variable and access the whole history of the current session. In such cases you can instruct Sponge to purge entries only on shell exit with sponge_purge_only_on_exit variable:

set sponge_purge_only_on_exit true

💡 Did you know you can change settings only for the current session? Just add --global flag when setting any variable and it won't be preserved after shell exit.

Sponge works by invoking an array of filters. You can plug into this mechanism by defining your own filters.

Filter is simply a function with a specific call signature:

Return with exit status 0 to filter out provided command and anything else to keep the command in the history.

You can define your filter in config.fish or as a standalone function in fish functions folder.

Be mindful of what you put in filters, as they are run synchronously after each command execution and can slow down your prompt in case of compute-intensive tasks or network requests.

After that you need to register your filter with Sponge by adding its name in sponge_filters variable:

set --append sponge_filters my_awesome_filter

Make sure to append sponge_filters like in the example above unless you want to disable the built in filters:

• sponge_filter_failed filters by command exit code
• sponge_filter_matched filters using regex patterns

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