From e81d38c02b267eea93a91de3e8a00b185355d681 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 17 Feb 2014 13:34:24 +0100
Subject: [PATCH] nix-shell: Execute shellHook if it exists
Since normal builds don't execute shellHook, this allows nix-shell
specific customisation. Suggested by Domen.
---
doc/manual/nix-shell.xml | 16 ++++++++++++++++
scripts/nix-build.in | 1 +
2 files changed, 17 insertions(+)
diff --git a/doc/manual/nix-shell.xml b/doc/manual/nix-shell.xml
index e57c726f5..4b369662e 100644
--- a/doc/manual/nix-shell.xml
+++ b/doc/manual/nix-shell.xml
@@ -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>
diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index fff71021f..c197dcca9 100755
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -207,6 +207,7 @@ foreach my $expr (@exprs) {
($pure ? '' : 'p=$PATH; ' ) .
'dontAddDisableDepTrack=1; ' .
'[ -e $stdenv/setup ] && source $stdenv/setup; ' .
+ 'if [ "$(type -t runHook)" = function ]; then runHook shellHook; fi; ' .
($pure ? '' : 'PATH=$PATH:$p; unset p; ') .
'set +e; ' .
'[ -n "$PS1" ] && PS1="\n\[\033[1;32m\][nix-shell:\w]$\[\033[0m\] "; ' .
--
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