Plugins: How to determine ghc vs ghci - ghc-devs - Haskell.org

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Plugins: How to determine ghc vs ghci

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Levent Erkok

24 Nov 2015 24 Nov '15

2:37 a.m.

I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running. I tried: df <- getDynFlags let isGHCi = ghcMode df == CompManager Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument. Is there a better/more robust way of figuring out whether we're in an interactive session? -Levent.

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Aycan İrican

24 Nov 24 Nov

3:28 a.m.

How about `GHC.Environment.getFullArgs` which includes “—interactive” when you’re in GHCi?

On 24 Nov 2015, at 09:37, Levent Erkok wrote:

I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running.

I tried:

df <- getDynFlags let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an interactive session?

-Levent. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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Levent Erkok

8:58 p.m.

Thanks! That indeed does work. I'm a bit surprised though that there isn't already an internal boolean set somewhere; checking for a string in the arguments sounds a bit fragile. On Tue, Nov 24, 2015 at 12:28 AM, Aycan İrican wrote:

How about `GHC.Environment.getFullArgs` which includes “—interactive” when you’re in GHCi?

...
On 24 Nov 2015, at 09:37, Levent Erkok wrote:

I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running.

I tried:

df <- getDynFlags let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an interactive session?

-Levent. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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Michael Sloan

9:25 p.m.

The executable-path package wraps this up nicely with its `getScriptPath` function: https://hackage.haskell.org/package/executable-path-0.0.3/docs/System-Enviro... Probably best to use this existing function. Then, if a less fragile solution comes along, getScriptPath can do that instead. -Michael On Tue, Nov 24, 2015 at 5:58 PM, Levent Erkok wrote:

Thanks! That indeed does work.

I'm a bit surprised though that there isn't already an internal boolean set somewhere; checking for a string in the arguments sounds a bit fragile.

On Tue, Nov 24, 2015 at 12:28 AM, Aycan İrican wrote:

...
How about `GHC.Environment.getFullArgs` which includes “—interactive” when you’re in GHCi?

...
On 24 Nov 2015, at 09:37, Levent Erkok wrote:

I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running.

I tried:

df <- getDynFlags let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an interactive session?

-Levent. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

_______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs

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Simon Marlow

4 Dec 4 Dec

3:34 a.m.

On 24/11/2015 07:37, Levent Erkok wrote:

I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running.

I tried:

df <- getDynFlags let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an interactive session?

The best way is to check whether hscTarget df == HscInterpreted, and you can also check whether ghcLink df == LinkInMemory. Checking for the `--interactive` flag only works for the standalone GHCi, and not users of the GHC API. Cheers, Simon

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Levent Erkok

8:39 p.m.

Thanks Simon.. I tried the 'hscTarget df == HscInterpreted' check, and it works perfectly well. -Levent. On Fri, Dec 4, 2015 at 12:34 AM, Simon Marlow wrote:

On 24/11/2015 07:37, Levent Erkok wrote:

...
I'm working on a plugin, and would like to be able to tell if it's GHC or GHCi that's running.

I tried:

df <- getDynFlags let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an interactive session?

The best way is to check whether hscTarget df == HscInterpreted, and you can also check whether ghcLink df == LinkInMemory.

Checking for the `--interactive` flag only works for the standalone GHCi, and not users of the GHC API.

Cheers, Simon

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Aycan İrican
Levent Erkok
Michael Sloan
Simon Marlow