fcitx5-hooks: Created fcitx module to help with on-screen keyboard input

.gitignore

@@ -2,4 +2,6 @@ wayland-protos/*.c
 wayland-protos/*.h
 wayland-protos/*.xml
 *~
-convertablet
+convertablet
+
+fcitx5-hooks/libhooks.so

fcitx5-hooks/README.md

@@ -0,0 +1,26 @@
+# fcitx5-hooks
+
+This is a fcitx5 module that allows the user to run scripts on various fcitx events!
+
+## Build
+
+```bash
+./build.sh
+```
+
+## Install
+
+```bash
+./install.sh
+```
+
+Now, restart fcitx, and you should get the hooks module!
+
+## Hooks available
+
+All hooks are stored in `~/.config/fcitx5-hooks/`
+
+|         Name         |              File            |
+|----------------------|------------------------------|
+| InputContextFocusIn  | input-context-focus-in-hook  |
+| InputContextFocusOut | input-context-focus-out-hook |

fcitx5-hooks/build.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -ex
+
+clang++ -fPIC -std=c++20 -Wall -Wextra -pedantic -shared -o libhooks.so hooks.cpp -I/usr/include/Fcitx5/Core/ -I/usr/include/Fcitx5/Config -I/usr/include/Fcitx5/Utils -lFcitx5Core -lFcitx5Config -lFcitx5Utils

fcitx5-hooks/hooks.conf

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+[Addon]
+Name=Hooks
+Category=Module
+Library=libhooks
+Type=SharedLibrary
+OnDemand=False
+Configurable=False

fcitx5-hooks/hooks.cpp

@@ -0,0 +1,76 @@
+#include <fcitx-utils/handlertable_details.h>
+#include <fcitx/addonfactory.h>
+#include <fcitx/addoninstance.h>
+#include <fcitx/addonmanager.h>
+#include <fcitx/instance.h>
+
+#include <filesystem>
+
+#include <stdlib.h>
+#include <unistd.h>
+
+namespace fs = std::filesystem;
+
+static fs::path const hooksConfigDir =
+    fs::path(getenv("XDG_CONFIG_DIR")
+                 ? getenv("XDG_CONFIG_DIR")
+                 : (fs::path(getenv("HOME")) / ".config")) /
+    "fcitx5-hooks";
+
+void runCommand(std::string_view hookName)
+{
+	auto  full_path = hooksConfigDir / hookName;
+	pid_t pid       = fork();
+
+	if (pid < 0) {
+		FCITX_ERROR() << "Couldn't fork to run command";
+		return;
+	} else if (pid == 0) {
+		char* argv[] = {strdup(full_path.c_str()), 0};
+		execve(full_path.c_str(), argv, environ);
+		exit(-1);
+	}
+	return;
+}
+
+static void eventHandler(fcitx::Event& event)
+{
+	using ET = fcitx::EventType;
+	switch (event.type()) {
+	case ET::InputContextFocusIn:
+		runCommand("input-context-focus-in-hook");
+	case ET::InputContextFocusOut:
+		runCommand("input-context-focus-out-hook");
+	default:
+	}
+}
+
+class Hooks : public fcitx::AddonInstance
+{
+  public:
+	Hooks(fcitx::Instance* instance)
+	{
+#define WATCH_EVENT(event_name)                                                \
+	instance->watchEvent(fcitx::EventType::event_name,                       \
+	                     fcitx::EventWatcherPhase::InputMethod,                \
+	                     eventHandler)
+
+		focusEvent_ = WATCH_EVENT(InputContextFocusIn);
+		unfocusEvent_ = WATCH_EVENT(InputContextFocusOut);
+	}
+
+  private:
+	std::unique_ptr<fcitx::HandlerTableEntry<fcitx::EventHandler>> focusEvent_;
+	std::unique_ptr<fcitx::HandlerTableEntry<fcitx::EventHandler>> unfocusEvent_;
+};
+
+class HooksFactory : public fcitx::AddonFactory
+{
+	fcitx::AddonInstance* create(fcitx::AddonManager* manager) override
+	{
+		FCITX_UNUSED(manager);
+		return new Hooks(manager->instance());
+	}
+};
+
+FCITX_ADDON_FACTORY(HooksFactory);

fcitx5-hooks/install.sh

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+#!/bin/sh
+
+[ ! "$UID" = 0 ] && echo "You must run this script as root" && exit 1
+
+echo "Installing..."
+
+set -ex
+
+cp libhooks.so /usr/lib64/fcitx5/
+cp hooks.conf /usr/share/fcitx5/addon/