Parse info files

cli/main.cpp

@@ -1,8 +1,165 @@
 #include <filesystem>
 #include <iostream>
+#include <fstream>
+#include <algorithm>
+#include <optional>
+#include <boost/algorithm/string.hpp>
 #include "katja/database.hpp"
 
-int main()
+bool trim_info_line(std::string& info_value)
+{
+    if (boost::algorithm::ends_with(info_value, "\""))
+    {
+        info_value.pop_back();
+        return false;
+    }
+    else if (boost::algorithm::ends_with(info_value, "\\"))
+    {
+        info_value.pop_back();
+        return true;
+    }
+    return false;
+}
+
+struct info_file
+{
+    const std::string program_name;
+    const std::string version;
+    const std::string homepage;
+    const std::string email;
+    const std::string maintainer;
+
+    info_file(const std::string& program_name, const std::string& version,
+            const std::string homepage, const std::string& email, const std::string& maintainer)
+        : program_name(program_name), version(version), homepage(homepage), email(email), maintainer(maintainer)
+    {
+    }
+};
+
+std::optional<info_file> read_slackbuild_info(const std::filesystem::path& info_filepath)
+{
+    std::ifstream info_stream{ info_filepath };
+    std::string info_line, info_variable, info_value;
+    std::string program_name, version, homepage, email, maintainer;
+    std::vector<std::string> download, md5sum, download_x86_64, md5sum_x86_64, requires;
+    bool continuation{ false };
+
+    while (std::getline(info_stream, info_line))
+    {
+        if (info_line.empty())
+        {
+            continue;
+        }
+        else if (!continuation)
+        {
+            auto equals_position = std::find(info_line.cbegin(), info_line.cend(), '=');
+            info_variable = std::string(info_line.cbegin(), equals_position);
+
+            if (equals_position == info_line.cend()
+                    || ++equals_position == info_line.cend() || *equals_position != '"')
+            {
+                return std::nullopt;
+            }
+            info_value = std::string(std::next(equals_position), info_line.cend());
+        }
+        else
+        {
+            info_value += info_line;
+        }
+        continuation = trim_info_line(info_value);
+
+        if (!continuation)
+        {
+            if (info_variable == "PRGNAM")
+            {
+                std::swap(program_name, info_value);
+            }
+            else if (info_variable == "VERSION")
+            {
+                std::swap(version, info_value);
+            }
+            else if (info_variable == "HOMEPAGE")
+            {
+                std::swap(homepage, info_value);
+            }
+            else if (info_variable == "EMAIL")
+            {
+                std::swap(email, info_value);
+            }
+            else if (info_variable == "MAINTAINER")
+            {
+                std::swap(maintainer, info_value);
+            }
+            else if (info_variable == "DOWNLOAD")
+            {
+                boost::split(download, info_value, boost::is_any_of(" "), boost::token_compress_on);
+            }
+            else if (info_variable == "MD5SUM")
+            {
+                boost::split(md5sum, info_value, boost::is_any_of(" "), boost::token_compress_on);
+            }
+            else if (info_variable == "DOWNLOAD_x86_64")
+            {
+                boost::split(download_x86_64, info_value, boost::is_any_of(" "), boost::token_compress_on);
+            }
+            else if (info_variable == "MD5SUM_x86_64")
+            {
+                boost::split(md5sum_x86_64, info_value, boost::is_any_of(" "), boost::token_compress_on);
+            }
+            else if (info_variable == "REQUIRES")
+            {
+                boost::split(requires, info_value, boost::is_any_of(" "), boost::token_compress_on);
+            }
+       }
+    }
+    return std::make_optional<info_file>(program_name, version, homepage, email, maintainer);
+}
+
+void search_for_slackbuilds(std::vector<info_file>& info_files, const std::filesystem::path& directory)
+{
+    for (const auto& entry : std::filesystem::directory_iterator(directory))
+    {
+        std::filesystem::path entry_path = entry;
+        std::filesystem::path info_filename = entry_path;
+        info_filename.replace_extension(".info");
+
+        std::filesystem::path info_filepath = entry_path / info_filename;
+
+        if (std::filesystem::exists(info_filepath))
+        {
+            auto slackbuild_info = read_slackbuild_info(info_filepath);
+
+            if (slackbuild_info.has_value())
+            {
+                info_files.emplace_back(std::move(slackbuild_info.value()));
+            }
+            else
+            {
+                std::cout << info_filepath << std::endl;
+            }
+        }
+        else if (std::filesystem::is_directory(entry_path))
+        {
+            search_for_slackbuilds(info_files, entry_path);
+        }
+    }
+}
+
+int main(int argc, const char **argv)
+{
+    std::vector<info_file> info_files;
+
+    if (argc > 1)
+    {
+        std::filesystem::path slackbuild_repository{ argv[1] };
+
+        search_for_slackbuilds(info_files, slackbuild_repository);
+        for (const auto& slackbuild_info : info_files)
+        {
+            std::cout << slackbuild_info.program_name << " " << slackbuild_info.version << " " << std::endl;
+        }
+    }
+    else
     {
         for (const auto& entry : std::filesystem::directory_iterator(katja::database))
         {
@@ -10,5 +167,6 @@ int main()
 
             std::cout << database_entry.to_string() << std::endl;
         }
+    }
     return 0;
 }