ghc-stdin: Compile source code from the standard input
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- ghc-stdin-0.1.0.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
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| Versions [RSS] | 0.1.0.0, 0.1.1.0, 0.1.1.1, 0.2.0.0 |
|---|---|
| Change log | Changelog.md |
| Dependencies | base (>=4.11.0.0 && <5), ghc (>=8.4.1), ghc-paths, process, temporary [details] |
| License | BSD-3-Clause |
| Author | Alexey Radkov |
| Maintainer | alexey.radkov@gmail.com |
| Category | Development |
| Bug tracker | https://github.com/lyokha/ghc-stdin/issues |
| Source repo | head: git clone https://github.com/lyokha/ghc-stdin |
| Uploaded | by lyokha at 2022-08-03T16:44:58Z |
| Distributions | NixOS:0.2.0.0 |
| Downloads | 263 total (11 in the last 30 days) |
| Rating | (no votes yet) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2022-08-03 [all 1 reports] |
Readme for ghc-stdin-0.1.0.0
[back to package description]GHC frontend plugin GhcStdin
In GHC, it is not possible to read source code from the standard input.
$ echo 'module Main where main = putStrLn "Ok"' | ghc -o simple_ok
ghc-9.2.3: no input files
Usage: For basic information, try the `--help' option.
This plugin makes this possible.
$ echo 'module Main where main = putStrLn "Ok"' | ghc --frontend GhcStdin -ffrontend-opt="-o simple_ok"
[1 of 1] Compiling Main ( ghc-stdin-d8c31cf0ed893d79/ghc-stdin260612-0.hs, ghc-stdin-d8c31cf0ed893d79/ghc-stdin260612-0.o )
Linking simple_ok ...
$ ./simple_ok
Ok
Notice that GHC flags are passed via -ffrontend-opt in a single string.
Another use case is collecting exported FFI C functions from a module and putting them in a new shared library.
$ export NGX_MODULE_PATH=/var/lib/nginx/x86_64-linux-ghc-9.2.3
$ echo 'module NgxHealthcheck where import NgxExport.Healthcheck ()' | ghc --frontend GhcStdin -ffrontend-opt="-Wall -O2 -dynamic -shared -fPIC -lHSrts_thr-ghc$(ghc --numeric-version) -L$NGX_MODULE_PATH -lngx_healthcheck_plugin -o ngx_healthcheck.so"
[1 of 1] Compiling NgxHealthcheck ( ghc-stdin-74de48274545714b/ghc-stdin266454-0.hs, ghc-stdin-74de48274545714b/ghc-stdin266454-0.o )
Linking ngx_healthcheck.so ...
(this is a real-world example taken from nginx-healthcheck-plugin).
Internally, the plugin creates a temporary directory with a temporary source file inside it with the contents read from the standard input. Then it spawns another GHC process to compile this file with options passed in -ffrontend-opt.