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nix flake list-inputs: Pretty-print the tree

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This commit is contained in:
Eelco Dolstra 2020-01-31 14:01:46 +01:00
parent a6e2b6b360
commit 678301072f
5 changed files with 54 additions and 25 deletions
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34
src/libutil/util.hh
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@ -458,6 +458,13 @@ void ignoreException();
#define ANSI_BLUE "\e[34;1m"
/* Tree formatting. */
constexpr char treeConn[] = "╠═══";
constexpr char treeLast[] = "╚═══";
constexpr char treeLine[] = "║ ";
constexpr char treeNull[] = " ";
/* Truncate a string to 'width' printable characters. If 'filterAll'
is true, all ANSI escape sequences are filtered out. Otherwise,
some escape sequences (such as colour setting) are copied but not
@ -583,4 +590,31 @@ extern PathFilter defaultPathFilter;
AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode);
// A Rust/Python-like enumerate() iterator adapter.
// Borrowed from http://reedbeta.com/blog/python-like-enumerate-in-cpp17.
template <typename T,
typename TIter = decltype(std::begin(std::declval<T>())),
typename = decltype(std::end(std::declval<T>()))>
constexpr auto enumerate(T && iterable)
{
struct iterator
{
size_t i;
TIter iter;
bool operator != (const iterator & other) const { return iter != other.iter; }
void operator ++ () { ++i; ++iter; }
auto operator * () const { return std::tie(i, *iter); }
};
struct iterable_wrapper
{
T iterable;
auto begin() { return iterator{ 0, std::begin(iterable) }; }
auto end() { return iterator{ 0, std::end(iterable) }; }
};
return iterable_wrapper{ std::forward<T>(iterable) };
}
}