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nix-shell: Execute shellHook if it exists

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Since normal builds don't execute shellHook, this allows nix-shell
specific customisation.  Suggested by Domen.
This commit is contained in:
Eelco Dolstra 2014-02-17 13:34:24 +01:00
parent 832377bbd6
commit e81d38c02b
2 changed files with 17 additions and 0 deletions
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16
doc/manual/nix-shell.xml
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@ -51,6 +51,22 @@ derivation for development.</para>
<filename>shell.nix</filename> if it exists, and
<filename>default.nix</filename> otherwise.</para>
<para>If the derivation defines the variable
<varname>shellHook</varname>, it will be evaluated after
<literal>$stdenv/setup</literal> has been sourced. Since this hook is
not executed by regular Nix builds, it allows you to perform
initialisation specific to <command>nix-shell</command>. For example,
the derivation attribute
<programlisting>
shellHook =
''
echo "Hello shell!"
'';
</programlisting>
will cause <command>nix-shell</command> to print <literal>Hello shell!</literal>.</para>
</refsection>