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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 Changes Only tortoise/​shellext/​QueryDirstate.cpp Stacked
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   // Copyright (C) 2009 Benjamin Pollack  // Copyright (C) 2009 Adrian Buehlmann  //  // This program is free software: you can redistribute it and/or modify  // it under the terms of the GNU General Public License as published by  // the Free Software Foundation, either version 2 of the License, or  // (at your option) any later version.  //  // This program is distributed in the hope that it will be useful,  // but WITHOUT ANY WARRANTY; without even the implied warranty of  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the  // GNU General Public License for more details.  //  // You should have received a copy of the GNU General Public License  // along with this program. If not, see <http://www.gnu.org/licenses/>.    #include "stdafx.h"    #include "QueryDirstate.h"  #include "dirstate.h"  #include "DirectoryStatus.h"  #include "Dirstatecache.h"  #include "TortoiseUtils.h"  #include "Winstat.h"    #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;     size_t offset = hgroot.length();   if (path[offset] == '\\')   offset++;   const char* relpathptr = path.c_str() + offset;     std::string relpath = relpathptr;     for (size_t i = 0; i < relpath.size(); ++i)   {   if (relpath[i] == '\\')   relpath[i] = '/';   }     if (relpath == ".hg"   || (relpath.size() > 4 && relpath.compare(0, 4, ".hg/") == 0))   return 0; // don't descend into .hg dir     if (PathIsDirectory(path.c_str()))   {   DirectoryStatus* pds = DirectoryStatus::get(hgroot);   if (!pds)   return 0;     outStatus = pds->status(relpath);   }   else   {   Dirstate* pds = Dirstatecache::get(hgroot);   if (!pds)   {   TDEBUG_TRACE("HgQueryDirstate: Dirstatecache::get("   << hgroot << ") returns no Dirstate");   return 0;   }     if (filterStatus == 'A' && pds->num_added() == 0)   return 0;     const Direntry* e = pds->root().get(relpath);   if (!e)   return 0;     Winstat stat;   if (0 != stat.lstat(path.c_str())) {   TDEBUG_TRACE("HgQueryDirstate: lstat(" << path << ") failed");   return 0;   }     outStatus = e->status(stat);   }     return 1;  }