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repl: complete if all matches share prefix

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This commit is contained in:
Will Dietz 2018-06-26 13:06:46 -05:00
parent 3d974d31fa
commit 9f998096d2
1 changed files with 18 additions and 0 deletions
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18
src/nix/repl.cc
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@ -132,6 +132,24 @@ static char * completionCallback(char * s, int *match) {
auto *res = strdup(possible.begin()->c_str() + strlen(s));
if (!res) throw Error("allocation failure");
return res;
} else if (possible.size() > 1) {
auto checkAllHaveSameAt = [&](size_t pos) {
auto &first = *possible.begin();
for (auto &p : possible) {
if (p.size() <= pos || p[pos] != first[pos])
return false;
}
return true;
};
size_t start = strlen(s);
size_t len = 0;
while (checkAllHaveSameAt(start + len)) ++len;
if (len > 0) {
*match = 1;
auto *res = strdup(std::string(*possible.begin(), start, len).c_str());
if (!res) throw Error("allocation failure");
return res;
}
}
*match = 0;