[main] replace rootbrowse.py with C++ version #19722
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,170 @@ | ||
| // \file rootbrowse.cxx | ||
| /// | ||
| /// Command line tool to open a ROOT file on a TBrowser | ||
| /// | ||
| /// \author Giacomo Parolini <giacomo.parolini@cern.ch> | ||
| /// \date 2025-08-21 | ||
| #include <ROOT/RLogger.hxx> | ||
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| #include <TApplication.h> | ||
| #include <TBrowser.h> | ||
| #include <TError.h> | ||
| #include <TFile.h> | ||
| #include <TGFrame.h> | ||
| #include <TROOT.h> | ||
| #include <TSystem.h> | ||
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| #include <chrono> | ||
| #include <cstring> | ||
| #include <iostream> | ||
| #include <memory> | ||
| #include <thread> | ||
| #include <string_view> | ||
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| static const char *const kShortHelp = "usage: rootbrowse [-w WEB|-wf] <file.root>\n"; | ||
| static const char *const kLongHelp = R"( | ||
| Open a ROOT file in a TBrowser | ||
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| positional arguments: | ||
| FILE Input file | ||
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| options: | ||
| -h, --help show this help message and exit | ||
| -w, --web WEB Configure webdisplay. For all possible values, see TROOT::SetWebDisplay(): | ||
| https://root.cern/doc/latest-stable/classTROOT.html#a1749472696545b76a6b8e79769e7e773 | ||
| -wf, --webOff Invoke the classic TBrowser (not the web version) | ||
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| Examples: | ||
| - rootbrowse | ||
| Open a TBrowser | ||
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| - rootbrowse file.root | ||
| Open the ROOT file 'file.root' in a TBrowser | ||
| )"; | ||
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| static ROOT::RLogChannel &RootBrowseLog() | ||
| { | ||
| static ROOT::RLogChannel channel("RootBrowse"); | ||
| return channel; | ||
| } | ||
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| struct RootBrowseArgs { | ||
| enum class EPrintUsage { | ||
| kNo, | ||
| kShort, | ||
| kLong | ||
| }; | ||
| EPrintUsage fPrintHelp = EPrintUsage::kNo; | ||
| std::string_view fWeb; | ||
| std::string_view fFileName; | ||
| }; | ||
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| static RootBrowseArgs ParseArgs(const char **args, int nArgs) | ||
| { | ||
| RootBrowseArgs outArgs; | ||
| bool forcePositional = false; | ||
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| for (int i = 0; i < nArgs; ++i) { | ||
| const char *arg = args[i]; | ||
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| if (strcmp(arg, "--") == 0) { | ||
| forcePositional = true; | ||
| continue; | ||
| } | ||
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| bool isFlag = !forcePositional && arg[0] == '-'; | ||
| if (isFlag) { | ||
| ++arg; | ||
| // Parse long or short flag and its argument into `argStr` / `nxtArgStr`. | ||
| std::string_view argStr, nxtArgStr; | ||
| if (arg[0] == '-') { | ||
| ++arg; | ||
| // long flag: may be either of the form `--web off` or `--web=off` | ||
| const char *eq = strchr(arg, '='); | ||
| if (eq) { | ||
| argStr = std::string_view(arg, eq - arg); | ||
| nxtArgStr = std::string_view(eq + 1); | ||
| } else { | ||
| argStr = std::string_view(arg); | ||
| if (i < nArgs - 1 && args[i + 1][0] != '-') { | ||
| nxtArgStr = args[i + 1]; | ||
| ++i; | ||
| } | ||
| } | ||
| } else { | ||
| // short flag (note that it might be more than 1 character long, like `-wf`) | ||
| argStr = std::string_view(arg); | ||
| if (i < nArgs - 1 && args[i + 1][0] != '-') { | ||
| nxtArgStr = args[i + 1]; | ||
| ++i; | ||
| } | ||
| } | ||
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| if (argStr == "w" || argStr == "web") { | ||
| outArgs.fWeb = nxtArgStr.empty() ? "on" : nxtArgStr; | ||
| } else if (argStr == "h" || argStr == "help") { | ||
| outArgs.fPrintHelp = RootBrowseArgs::EPrintUsage::kLong; | ||
| break; | ||
| } else if (argStr == "wf" || argStr == "--webOff") { | ||
| outArgs.fWeb = "off"; | ||
| } | ||
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| } else if (!outArgs.fFileName.empty()) { | ||
| outArgs.fPrintHelp = RootBrowseArgs::EPrintUsage::kShort; | ||
| break; | ||
| } else { | ||
| outArgs.fFileName = arg; | ||
| } | ||
| } | ||
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| return outArgs; | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| auto args = ParseArgs(const_cast<const char **>(argv) + 1, argc - 1); | ||
| if (args.fPrintHelp != RootBrowseArgs::EPrintUsage::kNo) { | ||
| std::cerr << kShortHelp; | ||
| if (args.fPrintHelp == RootBrowseArgs::EPrintUsage::kLong) { | ||
| std::cerr << kLongHelp; | ||
| return 0; | ||
| } | ||
| return 1; | ||
| } | ||
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| // NOTE: we need to instantiate TApplication ourselves, otherwise TBrowser | ||
| // will create a batch application that cannot show graphics. | ||
| TApplication app("rootbrowse", nullptr, nullptr); | ||
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| if (!args.fWeb.empty()) | ||
| gROOT->SetWebDisplay(std::string(args.fWeb).c_str()); | ||
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| std::unique_ptr<TFile> file; | ||
| if (!args.fFileName.empty()) { | ||
| gErrorIgnoreLevel = kError; | ||
| file = std::unique_ptr<TFile>(TFile::Open(std::string(args.fFileName).c_str(), "READ")); | ||
| if (!file || file->IsZombie()) { | ||
| R__LOG_WARNING(RootBrowseLog()) << "File " << args.fFileName << " does not exist or is unreadable."; | ||
| } | ||
| gErrorIgnoreLevel = kUnset; | ||
| } | ||
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| auto browser = std::make_unique<TBrowser>(); | ||
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| if (gROOT->IsBatch()) | ||
| return 1; | ||
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| // For classic graphics: ensure rootbrowse quits when the window is closed | ||
| if (auto imp = browser->GetBrowserImp()) { | ||
| if (auto mainframe = imp->GetMainFrame()) { | ||
| mainframe->Connect("CloseWindow()", "TApplication", &app, "Terminate()"); | ||
| } | ||
| } | ||
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| std::cout << "Press ctrl+c to exit.\n"; | ||
| while (!gROOT->IsInterrupted() && !gSystem->ProcessEvents()) { | ||
| std::this_thread::sleep_for(std::chrono::milliseconds(10)); | ||
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| } | ||
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| return 0; | ||
| } | ||
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