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Pretty-print 'nix why-depends' / 'nix-store -q --tree' output

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Extracted from 678301072f.
This commit is contained in:
Eelco Dolstra 2020-03-24 14:17:10 +01:00
parent 4260a22a55
commit 7a8de57d3e
4 changed files with 44 additions and 20 deletions
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15
src/nix-store/nix-store.cc
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@ -229,12 +229,6 @@ static StorePathSet maybeUseOutputs(const StorePath & storePath, bool useOutput,
/* Some code to print a tree representation of a derivation dependency
graph. Topological sorting is used to keep the tree relatively
flat. */
const string treeConn = "+---";
const string treeLine = "| ";
const string treeNull = " ";
static void printTree(const StorePath & path,
const string & firstPad, const string & tailPad, StorePathSet & done)
{
@ -254,10 +248,11 @@ static void printTree(const StorePath & path,
auto sorted = store->topoSortPaths(info->references);
reverse(sorted.begin(), sorted.end());
for (auto i = sorted.begin(); i != sorted.end(); ++i) {
auto j = i; ++j;
printTree(*i, tailPad + treeConn,
j == sorted.end() ? tailPad + treeNull : tailPad + treeLine,
for (const auto &[n, i] : enumerate(sorted)) {
bool last = n + 1 == sorted.size();
printTree(i,
tailPad + (last ? treeLast : treeConn),
tailPad + (last ? treeNull : treeLine),
done);
}
}