https://github.com/ypares/rescope.nu

Scoped and exception-safe resources for Nushell
https://github.com/ypares/rescope.nu

defer deferred deferred-execution nu nushell resources scoped

Last synced: 8 months ago
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Scoped and exception-safe resources for Nushell

• Host: GitHub
• URL: https://github.com/ypares/rescope.nu
• Owner: YPares
• Created: 2025-06-11T08:53:45.000Z (8 months ago)
• Default Branch: master
• Last Pushed: 2025-06-13T07:48:29.000Z (8 months ago)
• Last Synced: 2025-06-29T07:11:33.240Z (8 months ago)
• Topics: defer, deferred, deferred-execution, nu, nushell, resources, scoped
• Language: Nushell
• Homepage:
• Size: 9.77 KB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# rescope.nu

Scoped resources and deferred closure executions for Nushell.

Experimental.

## Example

(You can run it from this folder with `nu example.nu`)

```nu

use rescope.nu *

use std log

log set-level 0 # activate debug logs

rescope {|sc1|

  # We open a temp folder whose finalization (removal)

  # is scheduled at the end of this scope (closure):

  let path = mkscoped file -s $sc1 { mktemp --directory }

  # We schedule to print "Bye!" at the end of this closure:

  "Bye!" | defer -s $sc1 { print $in }

  rescope {|sc2|

    # Here, no `-s` is given: finalizers are by defaut attached to the

    # innermost scope. So here, sc2: 

    let job1 = mkscoped job { sleep 10sec }

    # But we can also target the outer scope:

    let job2 = mkscoped job -s $sc1 { sleep 10sec }

  } # End of sc2: $job1 gets killed

} # End of sc1: $job2 gets killed, then "Bye!" is printed, then $path gets deleted

  # (Resources are always finalized in the order inverse to their creation)

```