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QueryDirstate.cpp: new class HgRepoRoot

Caches calls to GetHgRepoRoot

Changeset 1560550fcdc4…

Parent 06f4688b4143…

by Adrian Buehlmann

Changes to one file · Browse files at 1560550fcdc4 Showing diff from parent 06f4688b4143 Diff from another changeset...

Change 1 of 1 Show Entire File tortoise/​shellext/​QueryDirstate.cpp Stacked
 
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@@ -27,13 +27,103 @@
 #include <shlwapi.h>     +class HgRepoRoot +{ + struct E + { + std::string hgroot_; + unsigned tickcount_; + unsigned hitcount_; + E(): tickcount_(0), hitcount_(0) {} + }; + + // true, if p is a subdir of refp, or identical + static bool is_subdir(const std::string& refp, const std::string& p); + +public: + static const std::string& get(const std::string& path); +}; + + +bool HgRepoRoot::is_subdir(const std::string& refp, const std::string& p) +{ + // refp = "foo\bar" + // p = "foo\bar\ping" -> return true + + if (refp.size() > p.size()) + return false; + + if (p.compare(0, refp.size(), refp) != 0) + return false; + + if (refp.size() == p.size()) + return true; + + // p is longer than refp + + char c = p[refp.size()]; + + // refp = "foo\bar" + // p = "foo\bar2", c is '2' -> return false + + if (c == '\\' || c == '/') + return true; + + return false; +} + + +const std::string& HgRepoRoot::get(const std::string& path) +{ + static E cache; + + if (!cache.hgroot_.empty() + && is_subdir(cache.hgroot_, path)) + { + unsigned tc = GetTickCount(); + if (tc - cache.tickcount_ < 2000) + { + ++cache.hitcount_; + return cache.hgroot_; + } + } + + std::string r = GetHgRepoRoot(path); + + bool show_hitcount = !cache.hgroot_.empty() && cache.hitcount_ > 0; + if (show_hitcount) + TDEBUG_TRACE("HgRepoRoot::get: '" + << cache.hgroot_ << "' had " << cache.hitcount_ << " hits"); + + cache.hitcount_ = 0; + + if (r.empty()) + { + cache.hgroot_.clear(); + cache.tickcount_ = 0; + } + else + { + if (show_hitcount) + { + const char* verb = (r != cache.hgroot_ ? "caching" : "refreshing" ); + TDEBUG_TRACE("HgRepoRoot::get: " << verb << " '" << cache.hgroot_ << "'"); + } + cache.hgroot_ = r; + cache.tickcount_ = GetTickCount(); + } + + return cache.hgroot_; +} + +  int HgQueryDirstate(   const std::string& path, const char& filterStatus, char& outStatus)  {   if (PathIsRoot(path.c_str()))   return 0;   - std::string hgroot = GetHgRepoRoot(path); + std::string hgroot = HgRepoRoot::get(path);   if (hgroot.empty())   return 0;