feat: Added command line interface support (#1172)

System design has been discussed on discord

Should fix #948

---------

Co-authored-by: WerWolv <werwolv98@gmail.com>

plugins/builtin/romfs/logo.ans

@@ -0,0 +1,21 @@
+ImHex Hex Editor
+  A Hex Editor for Reverse Engineers, Programmers and people
+  who value their retinas when working at 3 AM.
+                                               
+   ((((((((((((((((((((/   (((((((((((((((/  
+   ((((((((((((((((((((/   (((((((((((((((/  
+   *,,,,,        ,,,,,,*             ,,,,,*      Version:     {0}
+   ((((//        (((((//             (((((/      Commit:      {1}@{2}
+   (/////        (//////             ((((//      Build time:  {3}, {4}
+   /////*        //////*             //////      Type:        {5}
+   /////*        //////*             /////*  
+   /*****        /////**             /////*  
+   ******        *******             /*****  
+   *****,        ******,             ******  
+   **,,,,        *****,,             *****,  
+   *,,,,,        *,,,,,,             ****,,  
+   ,,,,,,        ,,,,,,,             *,,,,,  
+   ////////////////////*             ,,,,,,,  
+   *********************             ,.....   
+                                               
+

plugins/builtin/source/plugin_builtin.cpp

@@ -1,11 +1,15 @@
 #include <hex/plugin.hpp>
+#include <hex/subcommands/subcommands.hpp>
 
+#include <hex/api/event.hpp>
 #include <hex/api/content_registry.hpp>
 #include <hex/helpers/logger.hpp>
 
 #include <romfs/romfs.hpp>
 #include <nlohmann/json.hpp>
 
+using namespace hex;
+
 namespace hex::plugin::builtin {
 
     void registerEventHandlers();
@@ -41,8 +45,69 @@ namespace hex::plugin::builtin {
 
     void handleBorderlessWindowMode();
 
+    void handleSubCommands();
+
 }
 
+IMHEX_PLUGIN_SUBCOMMANDS() {
+    { "version", "Print ImHex version and exit", [](const std::vector<std::string>&) {
+        hex::print(romfs::get("logo.ans").string(),
+                   ImHexApi::System::getImHexVersion(),
+                   ImHexApi::System::getCommitBranch(), ImHexApi::System::getCommitHash(),
+                   __DATE__, __TIME__,
+                   ImHexApi::System::isPortableVersion() ? "Portable" : "Installed");
+
+        exit(EXIT_SUCCESS);
+    }},
+    { "help", "Print help about this command and exit", [](const std::vector<std::string>&) {
+        hex::print(
+            "ImHex - A Hex Editor for Reverse Engineers, Programmers and people who value their retinas when working at 3 AM.\n"
+            "\n"
+            "usage: imhex [subcommand] [options]\n"
+            "Available subcommands:\n"
+        );
+
+        size_t longestCommand = 0;
+        for (const auto &plugin : PluginManager::getPlugins()) {
+            for (const auto &subCommand : plugin.getSubCommands()) {
+                longestCommand = std::max(longestCommand, subCommand.commandKey.size());
+            }
+        }
+
+        for (const auto &plugin : PluginManager::getPlugins()) {
+            for (const auto &subCommand : plugin.getSubCommands()) {
+                hex::print("    --{}{: <{}}        {}\n", subCommand.commandKey, "", longestCommand - subCommand.commandKey.size(), subCommand.commandDesc);
+            }
+        }
+
+        exit(EXIT_SUCCESS);
+    }},
+    { "open", "Open files passed as argument. This is the default subcommand is none is entered",
+            [](const std::vector<std::string> &args) {
+
+        hex::subcommands::registerSubCommand("open", [](const std::vector<std::string> &args){
+            for (auto &arg : args) {
+                EventManager::post<RequestOpenFile>(arg);
+            }
+        });
+        
+        std::vector<std::string> fullPaths;
+        bool doubleDashFound = false;
+        for (auto &arg : args) {
+            
+            // Skip the first argument named `--`
+            if (arg == "--" && !doubleDashFound) {
+                doubleDashFound = true;
+            } else {
+                auto path = std::filesystem::weakly_canonical(arg);
+                fullPaths.push_back(wolv::util::toUTF8String(path));
+            }
+        }
+
+        hex::subcommands::forwardSubCommand("open", fullPaths);
+    }}
+};
+
 IMHEX_PLUGIN_SETUP("Built-in", "WerWolv", "Default ImHex functionality") {
 
     using namespace hex::plugin::builtin;