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* `nix-env -qa --description' shows human-readable descriptions of

Browse source 
packages (provided that they have a `meta.description' attribute).
  E.g.,

  $ ./src/nix-env/nix-env -qa --description gcc
  gcc-4.0.2   GNU Compiler Collection, 4.0.x (cross-compiler for sparc-linux)
  gcc-4.0.2   GNU Compiler Collection, 4.0.x (cross-compiler for mips-linux)
  gcc-4.0.2   GNU Compiler Collection, 4.0.x (cross-compiler for arm-linux)
  gcc-4.0.2   GNU Compiler Collection, 4.0.x
This commit is contained in:
Eelco Dolstra 2006-03-10 16:20:42 +00:00
parent a33fb2d287
commit 37d1b1cafd
7 changed files with 79 additions and 25 deletions
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17
src/libexpr/primops.cc
View file

@ -390,14 +390,21 @@ static Expr primDirOf(EvalState & state, const ATermVector & args)
}
ATerm coerceToString(Expr e)
{
ATerm s;
if (matchStr(e, s) || matchPath(e, s) || matchUri(e, s))
return s;
return 0;
}
/* Convert the argument (which can be a path or a uri) to a string. */
static Expr primToString(EvalState & state, const ATermVector & args)
{
Expr arg = evalExpr(state, args[0]);
ATerm s;
if (matchStr(arg, s) || matchPath(arg, s) || matchUri(arg, s))
return makeStr(s);
throw Error("cannot coerce value to string");
ATerm s = coerceToString(evalExpr(state, args[0]));
if (!s) throw Error("cannot coerce value to string");
return makeStr(s);
}