program-cabal.hs and program.hs turtle example

gistfile1.txt

06:23:31 [kiwi@mvp-nixos turtle-example]$ ./program-cabal.hs
these derivations will be built:
  /nix/store/c8pjxs7ykd2qdzhzzv1la6j042d2rbb1-ghc-8.6.5-with-packages.drv
these paths will be fetched (142.57 MiB download, 1737.41 MiB unpacked):
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copying path '/nix/store/qk9g8cy3v7wamqlf1wl4577aaq4m45c5-temporary-1.3' from 'https://cache.nixos.org'...
copying path '/nix/store/dbb0dmms7lvhwl68cnbh4dbnc7s0pwh5-monad-control-1.0.2.3' from 'https://cache.nixos.org'...
copying path '/nix/store/k9q3wggd0i9p06yd25g4fcq9fwmpi4cx-bifunctors-5.5.6' from 'https://cache.nixos.org'...
copying path '/nix/store/dkvyqdfmbhiqyx4v7ryvv2vqbgz6bnxz-lifted-base-0.2.3.12' from 'https://cache.nixos.org'...
copying path '/nix/store/ldgbnzygvzdmv94h39ks6p26c1fga8xw-enclosed-exceptions-1.0.3' from 'https://cache.nixos.org'...
copying path '/nix/store/llli2dswd6jhgp0j96x1phwg689cwxm7-lifted-async-0.10.0.4' from 'https://cache.nixos.org'...
copying path '/nix/store/4dl5nsigabvnl9qjf80vskj3ixzjil22-vector-builder-0.3.8' from 'https://cache.nixos.org'...
copying path '/nix/store/wvrqwsk7g405z2xr3v8dk2zakfrpi4y1-vector-th-unbox-0.2.1.7' from 'https://cache.nixos.org'...
copying path '/nix/store/cxlfyz4zfd5zsl0xnw3ncr4w8bgak9pw-profunctors-5.3' from 'https://cache.nixos.org'...
copying path '/nix/store/h2rx35vh4rqflgifggprhjyk8dw8wphv-semigroupoids-5.3.4' from 'https://cache.nixos.org'...
copying path '/nix/store/b3ja606prxyj5ln2xfxwlr19f8jlkzkp-math-functions-0.3.3.0' from 'https://cache.nixos.org'...
copying path '/nix/store/1n8qmf05b8amp8zg30wpbz4qdi54l6jr-shelly-1.8.1' from 'https://cache.nixos.org'...
copying path '/nix/store/r18i427zbwz70z500vqgj72capmvpv31-mwc-random-0.14.0.0' from 'https://cache.nixos.org'...
copying path '/nix/store/7rirnns8ar7zjb49xjqfjmlvfmqy5p23-foldl-1.4.5' from 'https://cache.nixos.org'...
copying path '/nix/store/9ryifyd3cqqlanvw4paflf9lnq9cakl8-turtle-1.5.15' from 'https://cache.nixos.org'...
building '/nix/store/c8pjxs7ykd2qdzhzzv1la6j042d2rbb1-ghc-8.6.5-with-packages.drv'...
/nix/store/llli2dswd6jhgp0j96x1phwg689cwxm7-lifted-async-0.10.0.4/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/96g58a5zdkwynxs6s0k2cszb0nzfy0zw-transformers-base-0.4.5.2/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/dbb0dmms7lvhwl68cnbh4dbnc7s0pwh5-monad-control-1.0.2.3/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/dkvyqdfmbhiqyx4v7ryvv2vqbgz6bnxz-lifted-base-0.2.3.12/nix-support:
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/nix/store/ldgbnzygvzdmv94h39ks6p26c1fga8xw-enclosed-exceptions-1.0.3/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/1n8qmf05b8amp8zg30wpbz4qdi54l6jr-shelly-1.8.1/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/qk9g8cy3v7wamqlf1wl4577aaq4m45c5-temporary-1.3/nix-support:
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/nix/store/lbkjabkih38d809cg427svsqsy5kcx1i-system-filepath-0.4.14/nix-support:
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/nix/store/32dxjr64kfl5gz4sik5hipqdxdhrp1v3-system-fileio-0.3.16.4/nix-support:
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/nix/store/9gbn0vvbln9rvrxf0m8a284jizxhab9k-zlib-0.6.2.1/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/w0svccn89i3c43vpl4wnp3wahd9adw7p-random-1.1/nix-support:
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/nix/store/if6iq54ab6ikcp6ygc2i478zz7l4lmdr-network-2.8.0.1/nix-support:
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/nix/store/545rnrnhqrplxckazhrfl022xlbjf8yr-streaming-commons-0.2.1.1/nix-support:
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/nix/store/v4i8sqms64338n10j11cc57kfprnfg0k-optparse-applicative-0.14.3.0/nix-support:
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/nix/store/fl3xqrvkdb3kks55v0m925azrxj21dg7-managed-1.0.6/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/4dl5nsigabvnl9qjf80vskj3ixzjil22-vector-builder-0.3.8/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/870zg5b5hlasmix084w7h288fqpqnfdc-unordered-containers-0.2.10.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/h2rx35vh4rqflgifggprhjyk8dw8wphv-semigroupoids-5.3.4/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/vrvaw8iikvaibyfzhm85ckx3ycva0794-th-abstraction-0.3.1.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/k9q3wggd0i9p06yd25g4fcq9fwmpi4cx-bifunctors-5.5.6/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/cxlfyz4zfd5zsl0xnw3ncr4w8bgak9pw-profunctors-5.3/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/wvrqwsk7g405z2xr3v8dk2zakfrpi4y1-vector-th-unbox-0.2.1.7/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/fyp3wza0fhw2dwz9r1na10yi4n61w33y-vector-0.12.0.3/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/ipn4n37fadri5c4gk5r1c5mag4ql3kb1-primitive-0.6.4.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/b3ja606prxyj5ln2xfxwlr19f8jlkzkp-math-functions-0.3.3.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/r18i427zbwz70z500vqgj72capmvpv31-mwc-random-0.14.0.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/hmz1w9j612wlscv3dbdjrcfdqxzlm93y-StateVar-1.2/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/r1clb9n99rmgdkqsf0964bml2bbbb8vc-contravariant-1.5.2/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/0f9sikmp8v9f1pj53xppbzc0l10xzib9-tagged-0.8.6/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/pgxzns7f59xvjr5prkalkdms50z8fhzh-base-orphans-0.8.1/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/w5hj7j12m2vyjg0lqaqzlvwgwws4lkgb-distributive-0.6.1/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/1j5n19lqm5gkh664l5a7zpwkyvwpzw85-comonad-5.0.6/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/7rirnns8ar7zjb49xjqfjmlvfmqy5p23-foldl-1.4.5/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/gpmzxa27cq4lvx38pwlxznv329qp6f58-transformers-compat-0.6.5/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/x3r7qk82zcg5ggn6m3gzkp14kxsjwcl0-exceptions-0.10.3/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/biiyfhdwgcmaww86604v2g8ggvbrzy9n-hashable-1.2.7.0/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/c6s5xcw3ynzv6cccclbkz0l51gbz4r0x-async-2.2.2/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/0s4i7ppmmsjnvv59242hxp7lh9ikhgxq-ansi-terminal-0.9.1/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/ymy70b8ccy9lhaxkrjghx4f8fd3dc2bd-ansi-wl-pprint-0.6.9/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/9ryifyd3cqqlanvw4paflf9lnq9cakl8-turtle-1.5.15/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
/nix/store/xzl45brcjzzq2nc4vpk77j2dlgqx74ab-ghc-8.6.5/nix-support:
propagated-build-inputs: /nix/store/9kk7lds4byyxyhnkbxq3i9m8hyh82xss-constraints-0.10.1/nix-support/propagated-build-inputs
Warning: The package list for 'hackage.haskell.org' is 52 days old.
Run 'cabal update' to get the latest list of available packages.
Warning: Parsing the index cache failed (Unknown encoding for constructor).
Trying to regenerate the index cache...
Resolving dependencies...
Build profile: -w ghc-8.6.5 -O1
In order, the following will be built (use -v for more details):
 - fake-package-0 (exe:script) (first run)
Configuring executable 'script' for fake-package-0..
Preprocessing executable 'script' for fake-package-0..
Building executable 'script' for fake-package-0..
[1 of 1] Compiling Main             ( Main.hs, /run/user/1000/cabal-repl.-10716/dist-newstyle/build/x86_64-linux/ghc-8.6.5/fake-package-0/x/script/build/script/script-tmp/Main.o )
Linking /run/user/1000/cabal-repl.-10716/dist-newstyle/build/x86_64-linux/ghc-8.6.5/fake-package-0/x/script/build/script/script ...
A simple `cp` utility

Usage: script SRC [DEST]

Available options:
  -h,--help                Show this help text
  SRC                      The source file
  DEST                     The destination file
06:25:12 [kiwi@mvp-nixos turtle-example]$

gistfile2.txt

06:25:12 [kiwi@mvp-nixos turtle-example]$ ./program.hs
these derivations will be built:
  /nix/store/nfi7gsva2z2dg0grg4v7n18lmgfhv50r-ghc-8.6.5-with-packages.drv
building '/nix/store/nfi7gsva2z2dg0grg4v7n18lmgfhv50r-ghc-8.6.5-with-packages.drv'...
/nix/store/qk9g8cy3v7wamqlf1wl4577aaq4m45c5-temporary-1.3/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/lbkjabkih38d809cg427svsqsy5kcx1i-system-filepath-0.4.14/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/32dxjr64kfl5gz4sik5hipqdxdhrp1v3-system-fileio-0.3.16.4/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/9gbn0vvbln9rvrxf0m8a284jizxhab9k-zlib-0.6.2.1/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/w0svccn89i3c43vpl4wnp3wahd9adw7p-random-1.1/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/if6iq54ab6ikcp6ygc2i478zz7l4lmdr-network-2.8.0.1/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/545rnrnhqrplxckazhrfl022xlbjf8yr-streaming-commons-0.2.1.1/nix-support:
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/nix/store/v4i8sqms64338n10j11cc57kfprnfg0k-optparse-applicative-0.14.3.0/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/fl3xqrvkdb3kks55v0m925azrxj21dg7-managed-1.0.6/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/4dl5nsigabvnl9qjf80vskj3ixzjil22-vector-builder-0.3.8/nix-support:
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/nix/store/870zg5b5hlasmix084w7h288fqpqnfdc-unordered-containers-0.2.10.0/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/h2rx35vh4rqflgifggprhjyk8dw8wphv-semigroupoids-5.3.4/nix-support:
propagated-build-inputs: /nix/store/7abin48xdjdv0lpqcm2pkg1vhcmf7ivw-unix-compat-0.5.2/nix-support/propagated-build-inputs
/nix/store/vrvaw8iikvaibyfzhm85ckx3ycva0794-th-abstraction-0.3.1.0/nix-support:
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/nix/store/k9q3wggd0i9p06yd25g4fcq9fwmpi4cx-bifunctors-5.5.6/nix-support:
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/nix/store/cxlfyz4zfd5zsl0xnw3ncr4w8bgak9pw-profunctors-5.3/nix-support:
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/nix/store/wvrqwsk7g405z2xr3v8dk2zakfrpi4y1-vector-th-unbox-0.2.1.7/nix-support:
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/nix/store/fyp3wza0fhw2dwz9r1na10yi4n61w33y-vector-0.12.0.3/nix-support:
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/nix/store/ipn4n37fadri5c4gk5r1c5mag4ql3kb1-primitive-0.6.4.0/nix-support:
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/nix/store/b3ja606prxyj5ln2xfxwlr19f8jlkzkp-math-functions-0.3.3.0/nix-support:
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/nix/store/r18i427zbwz70z500vqgj72capmvpv31-mwc-random-0.14.0.0/nix-support:
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/nix/store/hmz1w9j612wlscv3dbdjrcfdqxzlm93y-StateVar-1.2/nix-support:
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/nix/store/r1clb9n99rmgdkqsf0964bml2bbbb8vc-contravariant-1.5.2/nix-support:
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/nix/store/0f9sikmp8v9f1pj53xppbzc0l10xzib9-tagged-0.8.6/nix-support:
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/nix/store/pgxzns7f59xvjr5prkalkdms50z8fhzh-base-orphans-0.8.1/nix-support:
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A simple `cp` utility

Usage: program.hs SRC [DEST]

Available options:
  -h,--help                Show this help text
  SRC                      The source file
  DEST                     The destination file
06:27:57 [kiwi@mvp-nixos turtle-example]$

program-cabal.hs

#!/usr/bin/env nix-shell
#! nix-shell -p cabal-install -p "haskellPackages.ghcWithPackages (p: with p; [turtle shelly])" -i cabal
#!/usr/bin/env cabal
{- cabal:
build-depends: base >= 4.11
            , shelly >= 1.8.1
            , turtle
-}

{-# LANGUAGE OverloadedStrings #-}

import Prelude hiding (FilePath)
import Turtle

parser :: Parser (FilePath, Maybe FilePath)
parser =
  (,) <$> argPath "src" "The source file" <*>
  optional (argPath "dest" "The destination file")

main = do
  (src, mDest) <- options "A simple `cp` utility" parser
  case mDest of
    Nothing -> input src & stdout
    Just dest -> cp src dest


-- https://xkcd.com/1319/

program.hs

#!/usr/bin/env nix-shell
#! nix-shell -p "haskellPackages.ghcWithPackages (p: with p; [turtle])" -i runhaskell
{-# LANGUAGE OverloadedStrings #-}

import Prelude hiding (FilePath)
import Turtle

parser :: Parser (FilePath, Maybe FilePath)
parser =
  (,) <$> argPath "src" "The source file" <*>
  optional (argPath "dest" "The destination file")

main = do
  (src, mDest) <- options "A simple `cp` utility" parser
  case mDest of
    Nothing -> input src & stdout
    Just dest -> cp src dest