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nix: Reserve shebang line syntax and only parse double backtick quotes

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Being restrictive about syntax leaves opportunity to improve the
syntax and functionality later.
This commit is contained in:
Robert Hensing 2023-05-12 19:46:37 +02:00 • committed by tomberek
parent cc68ed8ff7
commit 20ff61ab25
6 changed files with 177 additions and 58 deletions
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43
src/libutil/util.cc
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@ -138,49 +138,6 @@ std::string shellEscape(const std::string_view s)
return r;
}
/* Recreate the effect of the perl shellwords function, breaking up a
* string into arguments like a shell word, including escapes
*/
std::vector<std::string> shellwords2(const std::string & s)
{
std::regex whitespace("^(\\s+).*");
auto begin = s.cbegin();
std::vector<std::string> res;
std::string cur;
enum state {
sBegin,
sQuote
};
state st = sBegin;
auto it = begin;
for (; it != s.cend(); ++it) {
if (st == sBegin) {
std::smatch match;
if (regex_search(it, s.cend(), match, whitespace)) {
cur.append(begin, it);
res.push_back(cur);
cur.clear();
it = match[1].second;
begin = it;
}
}
switch (*it) {
case '"':
cur.append(begin, it);
begin = it + 1;
st = st == sBegin ? sQuote : sBegin;
break;
case '\\':
/* perl shellwords mostly just treats the next char as part of the string with no special processing */
cur.append(begin, it);
begin = ++it;
break;
}
}
cur.append(begin, it);
if (!cur.empty()) res.push_back(cur);
return res;
}
void ignoreException(Verbosity lvl)
{