maurice/snix
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* Added an operator `~' to select paths within a derivation. E.g.,

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{stdenv, bash}: derivation {
      builder = bash ~ /bin/sh;
      args = ["-e" "-x" ./builder.sh];
      ...
    }

  Here the attribute `builder' will evaluate to, e.g.,
  `/nix/store/1234abcd...-bash-2.0.1/bin/sh'.
This commit is contained in:
Eelco Dolstra 2004-03-28 20:58:28 +00:00
parent db3e644c1c
commit f958bcdf1f
3 changed files with 16 additions and 0 deletions
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2
src/libexpr/parser.y
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@ -44,6 +44,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, void * data, char * s)
%nonassoc EQ NEQ
%right UPDATE
%left NEG
%nonassoc '~'
%%
@ -79,6 +80,7 @@ expr_op
| expr_op OR expr_op { $$ = ATmake("OpOr(<term>, <term>)", $1, $3); }
| expr_op IMPL expr_op { $$ = ATmake("OpImpl(<term>, <term>)", $1, $3); }
| expr_op UPDATE expr_op { $$ = ATmake("OpUpdate(<term>, <term>)", $1, $3); }
| expr_op '~' expr_op { $$ = ATmake("SubPath(<term>, <term>)", $1, $3); }
| expr_app
;