commercialhaskell/stack

Make stack kill executed process when running `stack build --file-watch --exec "foo"`

Open

#1,765 opened on Feb 9, 2016

View on GitHub
 (6 comments) (20 reactions) (0 assignees)Haskell (848 forks)batch import
help wantedtype: enhancement

Repository metrics

Stars
 (4,060 stars)
PR merge metrics
 (Avg merge 17d 10h) (6 merged PRs in 30d)

Description

When I am programming a long running application (like a web api), I'd like to have a feature where the program that has been executed after building is killed when a source code change is found.

For example, I am building an api using Servant and I would like to run it like this:

$ stack build --file-watch --exec "stack exec -- my-api"

Everytime I change one of my source files, it would be nice if stack automatically killed and restarted my-api.

Currently stack just waits until my-api is finished running (which never happens).

Contributor guide

Research direction
Investigate how stack currently handles the ` exec` command and the ` file watch` mode, and implement a way to kill the running process on file change. Look into using signals (e.g., SIGTERM) or process groups.
Tech stack
None
Domain
clibuild system
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Haskell
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40