Haskell stack command line flag for executing an expression
1
If I have a simple Haskell one-liner, what's the flag in ghc or ghci that could execute this from the command line?
I'm looking for something like:
stack ghci -e 'putStrLn "hello world"'
Similar to
$ R --quiet -e "cat('hello world')"
> cat('hello world')
hello world>
or
$ python -c "print('hello world')"
hello world
Edit for 'ghci -e' debug
(This question is resolved with an excellent answer already, but just debugging that the flag seems like it /should/ work above...)
Weirdly couldn't get the seemingly supported ghci -e working for me. Testing it is not just my machine, I also ran this on Ubuntu and had the same issue:
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update
&& apt-get install --yes curl
&& curl -sSL https://get.haskellstack.org/ | sh
&& export HOME=/root/.local/bin:$HOME
&& stack ghci -e 'putStrLn "hello world"'
Then
$ docker build .
Produced...
Stack has been installed to: /usr/local/bin/stack
WARNING: '/root/.local/bin' is not on your PATH.
For best results, please add it to the beginning of PATH in your profile.
Invalid option `-e'
Usage: stack ghci [TARGET/FILE] [--ghci-options OPTIONS] [--ghc-options OPTIONS]
[--flag PACKAGE:[-]FLAG] [--with-ghc GHC] [--[no-]load]
[--package ARG] [--main-is TARGET] [--load-local-deps]
[--[no-]package-hiding] [--only-main] [--trace] [--profile]
[--no-strip] [--[no-]test] [--[no-]bench] [--help]
Run ghci in the context of package(s) (experimental)
The command '/bin/sh -c apt-get update && apt-get install --yes curl && curl -sSL https://get.haskellstack.org/ | sh && export HOME=/root/.local/bin:$HOME && stack ghci -e 'putStrLn "hello world"'' returned a non-zero code: 1
haskell haskell-stack
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
add a comment |
1
If I have a simple Haskell one-liner, what's the flag in ghc or ghci that could execute this from the command line?
I'm looking for something like:
stack ghci -e 'putStrLn "hello world"'
Similar to
$ R --quiet -e "cat('hello world')"
> cat('hello world')
hello world>
or
$ python -c "print('hello world')"
hello world
Edit for 'ghci -e' debug
(This question is resolved with an excellent answer already, but just debugging that the flag seems like it /should/ work above...)
Weirdly couldn't get the seemingly supported ghci -e working for me. Testing it is not just my machine, I also ran this on Ubuntu and had the same issue:
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update
&& apt-get install --yes curl
&& curl -sSL https://get.haskellstack.org/ | sh
&& export HOME=/root/.local/bin:$HOME
&& stack ghci -e 'putStrLn "hello world"'
Then
$ docker build .
Produced...
Stack has been installed to: /usr/local/bin/stack
WARNING: '/root/.local/bin' is not on your PATH.
For best results, please add it to the beginning of PATH in your profile.
Invalid option `-e'
Usage: stack ghci [TARGET/FILE] [--ghci-options OPTIONS] [--ghc-options OPTIONS]
[--flag PACKAGE:[-]FLAG] [--with-ghc GHC] [--[no-]load]
[--package ARG] [--main-is TARGET] [--load-local-deps]
[--[no-]package-hiding] [--only-main] [--trace] [--profile]
[--no-strip] [--[no-]test] [--[no-]bench] [--help]
Run ghci in the context of package(s) (experimental)
The command '/bin/sh -c apt-get update && apt-get install --yes curl && curl -sSL https://get.haskellstack.org/ | sh && export HOME=/root/.local/bin:$HOME && stack ghci -e 'putStrLn "hello world"'' returned a non-zero code: 1
haskell haskell-stack
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
3
stack eval 'putStrLn "hello world"'
– Redu
Nov 25 '18 at 19:02
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06
add a comment |
1
1
1
If I have a simple Haskell one-liner, what's the flag in ghc or ghci that could execute this from the command line?
I'm looking for something like:
stack ghci -e 'putStrLn "hello world"'
Similar to
$ R --quiet -e "cat('hello world')"
> cat('hello world')
hello world>
or
$ python -c "print('hello world')"
hello world
Edit for 'ghci -e' debug
(This question is resolved with an excellent answer already, but just debugging that the flag seems like it /should/ work above...)
Weirdly couldn't get the seemingly supported ghci -e working for me. Testing it is not just my machine, I also ran this on Ubuntu and had the same issue:
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update
&& apt-get install --yes curl
&& curl -sSL https://get.haskellstack.org/ | sh
&& export HOME=/root/.local/bin:$HOME
&& stack ghci -e 'putStrLn "hello world"'
Then
$ docker build .
Produced...
Stack has been installed to: /usr/local/bin/stack
WARNING: '/root/.local/bin' is not on your PATH.
For best results, please add it to the beginning of PATH in your profile.
Invalid option `-e'
Usage: stack ghci [TARGET/FILE] [--ghci-options OPTIONS] [--ghc-options OPTIONS]
[--flag PACKAGE:[-]FLAG] [--with-ghc GHC] [--[no-]load]
[--package ARG] [--main-is TARGET] [--load-local-deps]
[--[no-]package-hiding] [--only-main] [--trace] [--profile]
[--no-strip] [--[no-]test] [--[no-]bench] [--help]
Run ghci in the context of package(s) (experimental)
The command '/bin/sh -c apt-get update && apt-get install --yes curl && curl -sSL https://get.haskellstack.org/ | sh && export HOME=/root/.local/bin:$HOME && stack ghci -e 'putStrLn "hello world"'' returned a non-zero code: 1
haskell haskell-stack
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
If I have a simple Haskell one-liner, what's the flag in ghc or ghci that could execute this from the command line?
I'm looking for something like:
stack ghci -e 'putStrLn "hello world"'
Similar to
$ R --quiet -e "cat('hello world')"
> cat('hello world')
hello world>
or
$ python -c "print('hello world')"
hello world
Edit for 'ghci -e' debug
(This question is resolved with an excellent answer already, but just debugging that the flag seems like it /should/ work above...)
Weirdly couldn't get the seemingly supported ghci -e working for me. Testing it is not just my machine, I also ran this on Ubuntu and had the same issue:
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update
&& apt-get install --yes curl
&& curl -sSL https://get.haskellstack.org/ | sh
&& export HOME=/root/.local/bin:$HOME
&& stack ghci -e 'putStrLn "hello world"'
Then
$ docker build .
Produced...
Stack has been installed to: /usr/local/bin/stack
WARNING: '/root/.local/bin' is not on your PATH.
For best results, please add it to the beginning of PATH in your profile.
Invalid option `-e'
Usage: stack ghci [TARGET/FILE] [--ghci-options OPTIONS] [--ghc-options OPTIONS]
[--flag PACKAGE:[-]FLAG] [--with-ghc GHC] [--[no-]load]
[--package ARG] [--main-is TARGET] [--load-local-deps]
[--[no-]package-hiding] [--only-main] [--trace] [--profile]
[--no-strip] [--[no-]test] [--[no-]bench] [--help]
Run ghci in the context of package(s) (experimental)
The command '/bin/sh -c apt-get update && apt-get install --yes curl && curl -sSL https://get.haskellstack.org/ | sh && export HOME=/root/.local/bin:$HOME && stack ghci -e 'putStrLn "hello world"'' returned a non-zero code: 1
haskell haskell-stack
haskell haskell-stack
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
edited Nov 25 '18 at 20:49
Mittenchops
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
asked Nov 25 '18 at 18:57
MittenchopsMittenchops
6,5312268140
6,5312268140
3
stack eval 'putStrLn "hello world"'
– Redu
Nov 25 '18 at 19:02
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06
add a comment |
3
stack eval 'putStrLn "hello world"'
– Redu
Nov 25 '18 at 19:02
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06
3
3
stack eval 'putStrLn "hello world"'– Redu
Nov 25 '18 at 19:02
stack eval 'putStrLn "hello world"'– Redu
Nov 25 '18 at 19:02
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06
add a comment |
2 Answers
2
active
oldest
votes
6
If you check $ stack --help at one point you see that
eval Evaluate some haskell code inline. Shortcut for
'stack exec ghc -- -e CODE'
So instead of doing like
$ stack exec ghc -- -e 'putStrLn "hello world"'
hello world
you may do like
$ stack eval 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
add a comment |
2
In fact you already have this flag: it is just:
-e expr
Evaluate
expr; see eval-mode for details
So you can write it like:
ghci -e 'putStrLn "hello world"'In fact if you use stack ghci, you just open ghci with your application, but the -e flag is not "stack-specific".
For example:
$ ghci -e 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
Hmm, I get:$ stack ghci -e 'putStrLn "hello world"' Invalid option-e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way:$ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc
– Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version ofghcido you use? This is already supported since 7.6 (or even eariler) iirc.
– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
|
show 1 more comment
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
6
If you check $ stack --help at one point you see that
eval Evaluate some haskell code inline. Shortcut for
'stack exec ghc -- -e CODE'
So instead of doing like
$ stack exec ghc -- -e 'putStrLn "hello world"'
hello world
you may do like
$ stack eval 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
add a comment |
6
If you check $ stack --help at one point you see that
eval Evaluate some haskell code inline. Shortcut for
'stack exec ghc -- -e CODE'
So instead of doing like
$ stack exec ghc -- -e 'putStrLn "hello world"'
hello world
you may do like
$ stack eval 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
add a comment |
6
6
6
If you check $ stack --help at one point you see that
eval Evaluate some haskell code inline. Shortcut for
'stack exec ghc -- -e CODE'
So instead of doing like
$ stack exec ghc -- -e 'putStrLn "hello world"'
hello world
you may do like
$ stack eval 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
If you check $ stack --help at one point you see that
eval Evaluate some haskell code inline. Shortcut for
'stack exec ghc -- -e CODE'
So instead of doing like
$ stack exec ghc -- -e 'putStrLn "hello world"'
hello world
you may do like
$ stack eval 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
answered Nov 25 '18 at 19:12
ReduRedu
13.1k22537
13.1k22537
add a comment |
add a comment |
2
In fact you already have this flag: it is just:
-e expr
Evaluate
expr; see eval-mode for details
So you can write it like:
ghci -e 'putStrLn "hello world"'In fact if you use stack ghci, you just open ghci with your application, but the -e flag is not "stack-specific".
For example:
$ ghci -e 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
Hmm, I get:$ stack ghci -e 'putStrLn "hello world"' Invalid option-e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way:$ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc
– Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version ofghcido you use? This is already supported since 7.6 (or even eariler) iirc.
– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
|
show 1 more comment
2
In fact you already have this flag: it is just:
-e expr
Evaluate
expr; see eval-mode for details
So you can write it like:
ghci -e 'putStrLn "hello world"'In fact if you use stack ghci, you just open ghci with your application, but the -e flag is not "stack-specific".
For example:
$ ghci -e 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
Hmm, I get:$ stack ghci -e 'putStrLn "hello world"' Invalid option-e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way:$ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc
– Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version ofghcido you use? This is already supported since 7.6 (or even eariler) iirc.
– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
|
show 1 more comment
2
2
2
In fact you already have this flag: it is just:
-e expr
Evaluate
expr; see eval-mode for details
So you can write it like:
ghci -e 'putStrLn "hello world"'In fact if you use stack ghci, you just open ghci with your application, but the -e flag is not "stack-specific".
For example:
$ ghci -e 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
In fact you already have this flag: it is just:
-e expr
Evaluate
expr; see eval-mode for details
So you can write it like:
ghci -e 'putStrLn "hello world"'In fact if you use stack ghci, you just open ghci with your application, but the -e flag is not "stack-specific".
For example:
$ ghci -e 'putStrLn "hello world"'
hello world
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
edited Nov 25 '18 at 19:08
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
answered Nov 25 '18 at 19:04
Willem Van OnsemWillem Van Onsem
150k16146235
150k16146235
Hmm, I get:$ stack ghci -e 'putStrLn "hello world"' Invalid option-e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way:$ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc
– Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version ofghcido you use? This is already supported since 7.6 (or even eariler) iirc.
– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
|
show 1 more comment
Hmm, I get:$ stack ghci -e 'putStrLn "hello world"' Invalid option-e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way:$ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc
– Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version ofghcido you use? This is already supported since 7.6 (or even eariler) iirc.
– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help
– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
Hmm, I get:
$ stack ghci -e 'putStrLn "hello world"' Invalid option -e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way: $ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc – Mittenchops
Nov 25 '18 at 19:05
Hmm, I get:
$ stack ghci -e 'putStrLn "hello world"' Invalid option -e' ` And don't otherwise have ghc installed outside of stack, if possible to keep it that way: $ ghc -e 'putStrLn "hello world"' Command 'ghc' not found, but can be installed with: sudo apt install ghc – Mittenchops
Nov 25 '18 at 19:05
@Mittenchops: what version of
ghci do you use? This is already supported since 7.6 (or even eariler) iirc.– Willem Van Onsem
Nov 25 '18 at 19:07
@Mittenchops: what version of
ghci do you use? This is already supported since 7.6 (or even eariler) iirc.– Willem Van Onsem
Nov 25 '18 at 19:07
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help– Mittenchops
Nov 25 '18 at 19:08
$ stack ghci Configuring GHCi with the following packages: GHCi, version 8.4.3: http://www.haskell.org/ghc/ :? for help– Mittenchops
Nov 25 '18 at 19:08
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
@Mittenchops: in 8.4.3, this flag is also supported: downloads.haskell.org/~ghc/8.4.3/docs/html/users_guide/…, strange
– Willem Van Onsem
Nov 25 '18 at 19:09
1
1
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
@Mittenchops: well I work with Ubuntu as well, so this makes it even more strange :S
– Willem Van Onsem
Nov 25 '18 at 19:26
|
show 1 more comment
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3
stack eval 'putStrLn "hello world"'– Redu
Nov 25 '18 at 19:02
@Redu, this works, can you post as an answer I can accept?
– Mittenchops
Nov 25 '18 at 19:06