Modifies Makefile to support multiple plugins

Introduces new convention for plugins that fixes
multi plugin support

Each plugin name will exist at :
- cmd/<plugin name>/main.go
  Definitions to call plugin registration

- internal/plugin/<plugin name>
  Implementations for Navigation, Tab and Print as appropriate

Change-Id: I6f5e71900eb90b26917216ebd1a2749acc4f5a52

Makefile

@@ -8,6 +8,7 @@ GIT_VERSION=$(shell git describe --match 'v*' --always)
 # Override the value of the version variable in main.go
 LD_FLAGS= '-X main.version=$(GIT_VERSION)'
 GO_FLAGS= -ldflags=$(LD_FLAGS)
+PLUGINS:= $(shell ls cmd)
 
 ifdef XDG_CONFIG_HOME
 	OCTANT_PLUGINSTUB_DIR ?= ${XDG_CONFIG_HOME}/octant/plugins
@@ -20,11 +21,16 @@ endif
 
 DIRS = internal pkg
 RECURSIVE_DIRS = $(addsuffix /...,$(DIRS))
+#.PHONY: install-plugin
+#install-plugin:
+#	mkdir -p $(OCTANT_PLUGINSTUB_DIR)
+#	go build -o $(OCTANT_PLUGINSTUB_DIR)/airship-ui-plugin $(GO_FLAGS) opendev.org/airship/airshipui/cmd/airshipui
 
-.PHONY: install-plugin
-install-plugin:
+.PHONY: install-plugins
+install-plugins: $(PLUGINS)
+$(PLUGINS):
 	mkdir -p $(OCTANT_PLUGINSTUB_DIR)
-	go build -o $(OCTANT_PLUGINSTUB_DIR)/airship-ui-plugin $(GO_FLAGS) opendev.org/airship/airshipui/cmd/airshipui
+	go build -o $(OCTANT_PLUGINSTUB_DIR)/$@-plugin $(GO_FLAGS) opendev.org/airship/airshipui/cmd/$@
 
 .PHONY: test
 test: generate

cmd/airshipui/main.go

@@ -1,31 +1,31 @@
 package main
 
 import (
-    "fmt"
-    "log"
+	"fmt"
+	"log"
 
-    "opendev.org/airship/airshipui/internal/plugin"
+	"opendev.org/airship/airshipui/internal/plugin/airshipui"
 )
 
 var (
-    pluginName = "airship-ui"
-    // version will be overriden by ldflags supplied in Makefile
-    version = "(dev-version)"
+	pluginName = "airship-ui"
+	// version will be overriden by ldflags supplied in Makefile
+	version = "(dev-version)"
 )
 
 // This is a sample plugin showing the features of Octant's plugin API.
 func main() {
-    // Remove the prefix from the go logger since Octant will print logs with timestamps.
-    log.SetPrefix("")
+	// Remove the prefix from the go logger since Octant will print logs with timestamps.
+	log.SetPrefix("")
 
-    description := fmt.Sprintf("Airship UI version %s", version)
-    // Use the plugin service helper to register this plugin.
-    p, err := plugin.Register(pluginName, description)
-    if err != nil {
-        log.Fatal(err)
-    }
+	description := fmt.Sprintf("Airship UI version %s", version)
+	// Use the plugin service helper to register this plugin.
+	p, err := plugin.Register(pluginName, description)
+	if err != nil {
+		log.Fatal(err)
+	}
 
-    // The plugin can log and the log messages will show up in Octant.
-    log.Printf("%s is starting", pluginName)
-    p.Serve()
+	// The plugin can log and the log messages will show up in Octant.
+	log.Printf("%s is starting", pluginName)
+	p.Serve()
 }