Add Session Switch plugin: 'Switch to Steam' power menu button for OpenGamepadUI

Makefile

@@ -0,0 +1,69 @@
+PLUGIN_ID ?= $(shell grep 'plugin\.id' plugin.json | grep -o ':.*' | grep -o '"[^"]\+"' | sed 's/"//g')
+PLUGIN_NAME ?= $(shell grep 'plugin\.name' plugin.json | grep -o ':.*' | grep -o '"[^"]\+"' | sed 's/"//g')
+
+GODOT ?= /usr/bin/godot
+OPENGAMEPAD_UI_REPO ?= https://github.com/ShadowBlip/OpenGamepadUI.git
+OPENGAMEPAD_UI_BASE ?= ../OpenGamepadUI
+EXPORT_PRESETS ?= $(OPENGAMEPAD_UI_BASE)/export_presets.cfg
+PLUGINS_DIR := $(OPENGAMEPAD_UI_BASE)/plugins
+BUILD_DIR := $(OPENGAMEPAD_UI_BASE)/build
+INSTALL_DIR := $(HOME)/.local/share/opengamepadui/plugins
+
+##@ General
+
+# The help target prints out all targets with their descriptions organized
+# beneath their categories. The categories are represented by '##@' and the
+# target descriptions by '##'. The awk commands is responsible for reading the
+# entire set of makefiles included in this invocation, looking for lines of the
+# file as xyz: ## something, and then pretty-format the target and help. Then,
+# if there's a line with ##@ something, that gets pretty-printed as a category.
+# More info on the usage of ANSI control characters for terminal formatting:
+# https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters
+# More info on the awk command:
+# http://linuxcommand.org/lc3_adv_awk.php
+
+.PHONY: help
+help: ## Display this help.
+	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
+
+##@ Development
+
+.PHONY: dist
+dist: build ## Build and package plugin
+
+.PHONY: build
+build: $(PLUGINS_DIR)/$(PLUGIN_ID) export_preset ## Build the plugin
+	@echo "Exporting plugin package"
+	cd $(OPENGAMEPAD_UI_BASE) && $(MAKE) addons
+	mkdir -p dist
+	touch dist/.gdignore
+	$(GODOT) --headless \
+		--path $(OPENGAMEPAD_UI_BASE) \
+		--export-pack "$(PLUGIN_NAME)" \
+		plugins/$(PLUGIN_ID)/dist/$(PLUGIN_ID).zip
+	cd dist && sha256sum $(PLUGIN_ID).zip > $(PLUGIN_ID).zip.sha256.txt
+
+.PHONY: install
+install: dist ## Installs the plugin
+	mkdir -p "$(INSTALL_DIR)"
+	cp -r dist/* "$(INSTALL_DIR)"
+	rm -rf $(INSTALL_DIR)/$(PLUGIN_ID)
+	@echo "Installed plugin to $(INSTALL_DIR)"
+
+$(OPENGAMEPAD_UI_BASE):
+	git clone $(OPENGAMEPAD_UI_REPO) $@
+
+$(PLUGINS_DIR)/$(PLUGIN_ID): $(OPENGAMEPAD_UI_BASE)
+	if ! [ -L $(PLUGINS_DIR)/$(PLUGIN_ID) ]; then ln -s $(PWD) $(PLUGINS_DIR)/$(PLUGIN_ID); fi
+
+.PHONY: export_preset
+export_preset: $(OPENGAMEPAD_UI_BASE) ## Configure plugin export preset
+	$(eval LAST_PRESET=$(shell grep -oEi '^\[preset\.([0-9]+)]' $(EXPORT_PRESETS) | tail -n 1))
+	$(eval LAST_PRESET_NUM=$(shell echo "$(LAST_PRESET)" | grep -oE '([0-9]+)'))
+	$(eval PRESET_NUM=$(shell echo "$(LAST_PRESET_NUM)+1" | bc))
+	@if grep 'name="$(PLUGIN_NAME)"' $(EXPORT_PRESETS) > /dev/null; then \
+		echo "Export preset already configured"; \
+	else \
+		echo "Preset not configured"; \
+		sed 's/PRESET_NUM/$(PRESET_NUM)/g; s/PLUGIN_NAME/$(PLUGIN_NAME)/g; s/PLUGIN_ID/$(PLUGIN_ID)/g' export_presets.cfg >> $(EXPORT_PRESETS); \
+	fi