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Add builtin constants ‘langVersion’ and ‘nixVersion’

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The integer constant ‘langVersion’ denotes the current language
version.  It gets increased every time a language feature is
added/changed/removed.  It's currently 1.

The string constant ‘nixVersion’ contains the current Nix version,
e.g. "1.2pre2980_9de6bc5".
This commit is contained in:
Eelco Dolstra 2012-11-27 13:29:55 +01:00
parent 5943f41b8b
commit 8b8ee53bc7
6 changed files with 18 additions and 2 deletions
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10
src/libexpr/primops.cc
View file

@ -1143,6 +1143,16 @@ void EvalState::createBaseEnv()
mkString(v, settings.thisSystem.c_str());
addConstant("__currentSystem", v);
mkString(v, nixVersion.c_str());
addConstant("__nixVersion", v);
/* Language version. This should be increased every time a new
language feature gets added. It's not necessary to increase it
when primops get added, because you can just use `builtins ?
primOp' to check. */
mkInt(v, 1);
addConstant("__langVersion", v);
// Miscellaneous
addPrimOp("import", 1, prim_import);
addPrimOp("isNull", 1, prim_isNull);