How to get the name from a nixpkgs derivation in a nix expression to be used by nix-shell? -

i'm writing .nix expression used nix-shell. i'm not sure how that. note not on nixos, don't think relevant.

the particular example i'm looking @ want this version-dependent name looks like:

  idea-ultimate = buildidea rec {     name = "idea-ultimate-${version}";     version = "2017.2.2"; /* updated script */     description = "integrated development environment (ide) jetbrains, requires paid license";     license = stdenv.lib.licenses.unfree;     src = fetchurl {       url = "https://download.jetbrains.com/idea/ideaiu-${version}-no-jdk.tar.gz";       sha256 = "b8eb9d612800cc896eb6b6fbefbf9f49d92d2350ae1c3c4598e5e12bf93be401"; /* updated script */     };     wmclass = "jetbrains-idea";     update-channel = "idea_release";   }; 

my nix expression following:

let   pkgs = import <nixpkgs> {};   stdenv = pkgs.stdenv;   # idea_name = assert pkgs.jetbrains.idea-ultimate.name != ""; pkgs.jetbrains.idea-ultimate.name; in rec {   scalaenv = stdenv.mkderivation rec {     name = "scala-env";     builder = "./scala-build.sh";     shellhook = ''     alias cls=clear     '';     clang_path = pkgs.clang + "/bin/clang";     clangpp_path = pkgs.clang + "/bin/clang++";     # bug in nixpkgs openjdk (#29151) makes resort zulu openjdk idea:     # idea_jdk = pkgs.openjdk + "/lib/openjdk";     # path = "${pkgs.jetbrains.idea-ultimate}/${idea_name}/bin:$path";     idea_jdk = /usr/lib/jvm/zulu-8-amd64;     # idea_jdk = /opt/zulu8.23.0.3-jdk8.0.144-linux_x64;     # idea_jdk = /usr/lib/jvm/java-8-openjdk-amd64;     buildinputs = pkgs; [       ammonite       boehmgc       clang       emacs       jetbrains.idea-ultimate       less       libunwind       openjdk       re2       sbt       stdenv       unzip       zlib     ];   }; }  

i have commented out setting path depends on getting idea_name in let-clause. interesting side note, is, not fail if leave uncommented causes bizarre error when executing nix-shell not being able execute bash. i've tried more simple case of let idea_name = pkgs.jetbrains.idea-ultimate.name; fails later on when idea_name used in setting path since idea_name ends being undefined.

update:

i began exploring nix-instantiate, derivation of interest seems empty:

[nix-shell:/nix/store]$ nix-instantiate --eval --xml -e "((import <nixpkgs> {}).callpackage ./3hk87pqgl2qdqmskxbhy23cyr24q8g6s-nixpkgs-18.03pre114739.d0d905668c/nixpkgs/pkgs/applications/editors/jetbrains { }).idea-ultimate";     <?xml version='1.0' encoding='utf-8'?> <expr>   <derivation>     <repeated />   </derivation> </expr> 

if intent idea-ultimate nix-shell environment, include package buildinputs. see it's included, should present in path.

btw, can extend shellhook , export path , other variables rather there, have full bash. why bash? less copying. when specify

idea_jdk = /usr/lib/jvm/zulu-8-amd64; 

in nix, file /usr/lib/jvm/zulu-8-amd64 get's copied nix store , idea_jdk set point file in /nix/store. intent?

regarding nix-instantiate:

$ nix-instantiate --eval -e 'with import <nixpkgs>{}; idea.pycharm-community.outpath'                                                                                    "/nix/store/71jk0spr30rm4wsihjwbb1hcwwvzqr4k-pycharm-community-2017.1" 

but still have remove doublequotes (https://gist.github.com/danbst/a9fc068ff26e31d88de9709965daa2bd)

also, nitpick, assert pkgs.jetbrains.idea-ultimate.name != ""; can dropped it's impossible have empty derivation name in nix.

and nitpick. you'll find incovenient launch ide shell every time. seems idea specify, package used development, nix-shell doesn't work non-cli applications. not mention occasional problems nix gc , nix-shell. you'd better install ide globally or per-user, better long-term solution.

---

[addendum]

you looking (dev-environment.nix):

with import <nixpkgs> { };  buildenv {   name = "my-super-dev-env";   paths = [       #emacs       nano       idea.pycharm-community   ];   buildinputs = [ makewrapper ];   postbuild = ''     f in $(ls -d $out/bin/*);       wrapprogram $f \         --set idea_jdk "/path/to/zulu-jdk" \         --set clang_path ... \         --set clancpp_path ...     done   ''; } 

which install using nix-env -if ./dev-environment.nix. wrap programs env vars, without polluting workspace (you can pollute further using nix-shell shell hook, if want).