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builtins.baseNameOf: Fork

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This commit is contained in:
Robert Hensing 2024-03-24 01:37:58 +01:00
parent 175afc7106
commit 754a15e2db
1 changed files with 21 additions and 1 deletions
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22
src/libexpr/primops.cc
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@ -1568,12 +1568,32 @@ static RegisterPrimOp primop_pathExists({
.fun = prim_pathExists,
});
// Ideally, all trailing slashes should have been removed, but it's been like this for
// almost a decade as of writing. Changing it will affect reproducibility.
static std::string_view legacyBaseNameOf(std::string_view path)
{
if (path.empty())
return "";
auto last = path.size() - 1;
if (path[last] == '/' && last > 0)
last -= 1;
auto pos = path.rfind('/', last);
if (pos == path.npos)
pos = 0;
else
pos += 1;
return path.substr(pos, last - pos + 1);
}
/* Return the base name of the given string, i.e., everything
following the last slash. */
static void prim_baseNameOf(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
NixStringContext context;
v.mkString(baseNameOf(*state.coerceToString(pos, *args[0], context,
v.mkString(legacyBaseNameOf(*state.coerceToString(pos, *args[0], context,
"while evaluating the first argument passed to builtins.baseNameOf",
false, false)), context);
}