vcpkg/toolsrc/src/commands_cache.cpp

#include "vcpkg_Commands.h"
#include "vcpkg_System.h"
#include "vcpkg_Files.h"
#include "Paragraphs.h"
#include "BinaryParagraph.h"

namespace vcpkg
{
    static std::vector<BinaryParagraph> read_all_binary_paragraphs(const vcpkg_paths& paths)
    {
        std::vector<BinaryParagraph> output;
        for (auto it = fs::directory_iterator(paths.packages); it != fs::directory_iterator(); ++it)
        {
            const fs::path& path = it->path();

            try
            {
                auto file_contents = Files::get_contents(path / "CONTROL");
                if (auto text = file_contents.get())
                {
                    auto pghs = Paragraphs::parse_paragraphs(*text);
                    if (pghs.size() != 1)
                        continue;

                    const BinaryParagraph binary_paragraph = BinaryParagraph(pghs[0]);
                    output.push_back(binary_paragraph);
                }
            }
            catch (std::runtime_error const&)
            {
            }
        }

        return output;
    }

    void cache_command(const vcpkg_cmd_arguments& args, const vcpkg_paths& paths)
    {
        static const std::string example = Strings::format(
            "The argument should be a substring to search for, or no argument to display all cached libraries.\n%s", create_example_string("cache png"));
        args.check_max_arg_count(1, example.c_str());

        const std::vector<BinaryParagraph> binary_paragraphs = read_all_binary_paragraphs(paths);
        if (binary_paragraphs.empty())
        {
            System::println("No packages are cached.");
            exit(EXIT_SUCCESS);
        }

        if (args.command_arguments.size() == 0)
        {
            for (const BinaryParagraph& binary_paragraph : binary_paragraphs)
            {
                const std::string displayname = binary_paragraph.displayname();
                System::println(displayname.c_str());
            }
        }
        else
        {
            // At this point there is 1 argument
            for (const BinaryParagraph& binary_paragraph : binary_paragraphs)
            {
                const std::string displayname = binary_paragraph.displayname();
                if (Strings::case_insensitive_ascii_find(displayname, args.command_arguments[0]) == displayname.end())
                {
                    continue;
                }

                System::println(displayname.c_str());
            }
        }

        exit(EXIT_SUCCESS);
    }
}