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nix-instantiate: Add a flag --expr / -E to read expressions from the command line

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This is basically a shortcut for ‘echo 'expr...' | nix-instantiate -’.
Also supported by nix-build and nix-shell.
This commit is contained in:
Eelco Dolstra 2014-02-19 16:30:19 +01:00
parent e707a8a526
commit c31836008e
6 changed files with 148 additions and 95 deletions
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9
src/nix-instantiate/nix-instantiate.cc
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@ -89,6 +89,7 @@ void run(Strings args)
EvalState state;
Strings files;
bool readStdin = false;
bool fromArgs = false;
bool findFile = false;
bool evalOnly = false;
bool parseOnly = false;
@ -104,6 +105,8 @@ void run(Strings args)
if (arg == "-")
readStdin = true;
else if (arg == "--expr" || arg == "-E")
fromArgs = true;
else if (arg == "--eval-only")
evalOnly = true;
else if (arg == "--read-write-mode")
@ -162,11 +165,13 @@ void run(Strings args)
Expr * e = parseStdin(state);
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
} else if (files.empty())
} else if (files.empty() && !fromArgs)
files.push_back("./default.nix");
foreach (Strings::iterator, i, files) {
Expr * e = state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
Expr * e = fromArgs
? state.parseExprFromString(*i, absPath("."))
: state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
}