commercialhaskell/stack

--exec --file-watch combo not working as expected

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#2,955 创建于 2017年1月27日

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 (5 评论) (1 反应) (0 负责人)Haskell (4,060 star) (848 fork)batch import
component: Windowsfurther investigation requiredhelp wantedtype: bug

描述

Steps to reproduce

Choose a repo and run:

stack build --exec "echo run me, please!" --file-watch

The echo doesn't echo yet. Type 'help'. The executable then runs eg

stack build --exec "echo run me, please!" --file-watch

help
run me, please!

help: display this help
quit: exit
build: force a rebuild
watched: display watched files
ExitSuccess
Type help for available commands. Press enter to force a rebuild.
quit

Associated with this, build does not seem to force a build.

Expected

I expected the executable to run initially,, before kicking the file-watch cycle in the guts.

Actual

the --exec runs after typing help

version

$ stack --version
Version 1.3.2 x86_64 hpack-0.15.0

贡献者指南

技术栈
无
领域
clibuild system
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
无
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
30
研究方向
Investigate the interaction between exec and file watch flags in the Stack build system. Start by looking at the command line parsing and the main build loop, likely in src/Stack/Build.hs or similar. Understand why the exec command runs only after a user input instead of at the start. The issue may be in the order of initialization of the file watch listener and the execution of the command.