nix: allow whitespace characters before command in repl
Before this change, processLine always uses the first character as the start of the line. This cause whitespaces to matter at the beginning of the line whereas it does not matter anywhere else. This commit trims leading white spaces of the string line so that subsequent operations can be performed on the string without explicitly tracking starting and ending indices of the string.
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@ -396,6 +396,7 @@ StorePath NixRepl::getDerivationPath(Value & v) {
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bool NixRepl::processLine(std::string line)
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{
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line = trim(line);
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if (line == "") return true;
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_isInterrupted = false;
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