Profiler: Add help documentation

Author: https://github.com/bcoles
Commit: https://github.com/SerenityOS/serenity/commit/0ffc06b7958
Pull-request: https://github.com/SerenityOS/serenity/pull/5509

Base/usr/share/man/man1/Profiler.md

@@ -0,0 +1,47 @@
+## Name
+
+Profiler - Serenity process profiler
+
+## Synopsis
+
+```**sh
+$ Profiler [--pid PID] [perfcore file]
+```
+
+## Description
+
+Profiler facilitates process performance profiling and provides a GUI offering
+visual graph and tree representations to easily navigate generated profiling
+information.
+
+If no arguments are provided, a window containing a list of running processes
+is presented, allowing a process to be selected for profiling.
+
+Profiling information is written to `perfcore.<pid>` in the working directory
+and opened immediately for browsing following termination of profiling.
+
+Profiler can also load performance information from previously created
+`perfcore` files.
+
+## Options
+
+* `-p PID`, `--pid PID`: PID to profile
+
+## Examples
+
+Profile running Shell process:
+
+```sh
+$ Profiler -p $(pidof Shell)
+```
+
+Open a previously created perfcore file for browsing:
+
+```sh
+$ Profiler perfcore.123
+```
+
+## See also
+
+* [`perfcore`(5)](../man5/perfcore.md)
+

Userland/DevTools/Profiler/CMakeLists.txt

@@ -7,4 +7,4 @@ set(SOURCES
 )
 
 serenity_app(Profiler ICON app-profiler)
-target_link_libraries(Profiler LibGUI LibX86 LibCoreDump)
+target_link_libraries(Profiler LibGUI LibDesktop LibX86 LibCoreDump)

Userland/DevTools/Profiler/main.cpp

@@ -31,6 +31,7 @@
 #include <LibCore/EventLoop.h>
 #include <LibCore/ProcessStatisticsReader.h>
 #include <LibCore/Timer.h>
+#include <LibDesktop/Launcher.h>
 #include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
@@ -80,6 +81,15 @@ int main(int argc, char** argv)
     auto& profile = profile_or_error.value();
 
     auto window = GUI::Window::construct();
+
+    if (!Desktop::Launcher::add_allowed_handler_with_only_specific_urls(
+            "/bin/Help",
+            { URL::create_with_file_protocol("/usr/share/man/man1/Profiler.md") })
+        || !Desktop::Launcher::seal_allowlist()) {
+        warnln("Failed to set up allowed launch URLs");
+        return 1;
+    }
+
     window->set_title("Profiler");
     window->set_icon(app_icon.bitmap_for_size(16));
     window->resize(800, 600);
@@ -144,6 +154,9 @@ int main(int argc, char** argv)
     view_menu.add_action(percent_action);
 
     auto& help_menu = menubar->add_menu("Help");
+    help_menu.add_action(GUI::CommonActions::make_help_action([](auto&) {
+        Desktop::Launcher::open(URL::create_with_file_protocol("/usr/share/man/man1/Profiler.md"), "/bin/Help");
+    }));
     help_menu.add_action(GUI::CommonActions::make_about_action("Profiler", app_icon, window));
 
     app->set_menubar(move(menubar));