fix: implement config-export hook

This will allow dropping many of the "source config/functions" calls littered over the codebase. Plugin triggers are the way to perform cross-plugin communication :)

docs/development/plugin-triggers.md

@@ -261,6 +261,21 @@ help_content
 esac
 ```
 
+### `config-export`
+
+- Description: Returns the environment variables in a specified format
+- Invoked by: app-json plugin
+- Arguments: `$APP $GLOBAL $MERGED $FORMAT`
+- Example:
+
+```shell
+#!/usr/bin/env bash
+
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+
+# TODO
+```
+
 ### `config-get`
 
 - Description: Fetches the app config value for a key

plugins/20_events/config-export

@@ -0,0 +1 @@
+hook

plugins/config/Makefile

@@ -1,5 +1,5 @@
 SUBCOMMANDS = subcommands/bundle subcommands/clear subcommands/export subcommands/get subcommands/keys subcommands/show subcommands/set subcommands/unset
-TRIGGERS = triggers/config-get triggers/config-get-global
+TRIGGERS = triggers/config-export triggers/config-get triggers/config-get-global
 BUILD = commands subcommands triggers
 PLUGIN_NAME = config
 

plugins/config/functions.go

@@ -0,0 +1,38 @@
+package config
+
+import "fmt"
+
+func export(appName string, global bool, merged bool, format string) error {
+	appName, err := getAppNameOrGlobal(appName, global)
+	if err != nil {
+		return err
+	}
+
+	env := getEnvironment(appName, merged)
+	exportType := ExportFormatExports
+	suffix := "\n"
+
+	exportTypes := map[string]ExportFormat{
+		"exports":          ExportFormatExports,
+		"envfile":          ExportFormatEnvfile,
+		"docker-args":      ExportFormatDockerArgs,
+		"docker-args-keys": ExportFormatDockerArgsKeys,
+		"shell":            ExportFormatShell,
+		"pretty":           ExportFormatPretty,
+		"json":             ExportFormatJSON,
+		"json-list":        ExportFormatJSONList,
+	}
+
+	exportType, ok := exportTypes[format]
+	if !ok {
+		return fmt.Errorf("Unknown export format: %v", format)
+	}
+
+	if exportType == ExportFormatShell {
+		suffix = " "
+	}
+
+	exported := env.Export(exportType)
+	fmt.Print(exported + suffix)
+	return nil
+}

plugins/config/src/triggers/triggers.go

@@ -18,6 +18,12 @@ func main() {
 
 	var err error
 	switch trigger {
+	case "config-export":
+		appName := flag.Arg(0)
+		global := flag.Arg(1)
+		merged := flag.Arg(2)
+		format := flag.Arg(3)
+		config.TriggerConfigExport(appName, global, merged, format)
 	case "config-get":
 		appName := flag.Arg(0)
 		key := flag.Arg(1)

plugins/config/subcommands.go

@@ -33,38 +33,7 @@ func CommandClear(appName string, global bool, noRestart bool) error {
 
 // CommandExport implements config:export
 func CommandExport(appName string, global bool, merged bool, format string) error {
-	appName, err := getAppNameOrGlobal(appName, global)
-	if err != nil {
-		return err
-	}
-
-	env := getEnvironment(appName, merged)
-	exportType := ExportFormatExports
-	suffix := "\n"
-
-	exportTypes := map[string]ExportFormat{
-		"exports":          ExportFormatExports,
-		"envfile":          ExportFormatEnvfile,
-		"docker-args":      ExportFormatDockerArgs,
-		"docker-args-keys": ExportFormatDockerArgsKeys,
-		"shell":            ExportFormatShell,
-		"pretty":           ExportFormatPretty,
-		"json":             ExportFormatJSON,
-		"json-list":        ExportFormatJSONList,
-	}
-
-	exportType, ok := exportTypes[format]
-	if !ok {
-		return fmt.Errorf("Unknown export format: %v", format)
-	}
-
-	if exportType == ExportFormatShell {
-		suffix = " "
-	}
-
-	exported := env.Export(exportType)
-	fmt.Print(exported + suffix)
-	return nil
+	return export(appName, global, merged, format)
 }
 
 // CommandGet implements config:get

plugins/config/triggers.go

@@ -1,6 +1,23 @@
 package config
 
-import "fmt"
+import (
+	"fmt"
+	"strconv"
+)
+
+// TriggerConfigExport returns a global config value by key
+func TriggerConfigExport(appName string, global string, merged string, format string) error {
+	g, err := strconv.ParseBool(global)
+	if err != nil {
+		return err
+	}
+
+	m, err := strconv.ParseBool(merged)
+	if err != nil {
+		return err
+	}
+	return export(appName, g, m, format)
+}
 
 // TriggerConfigGet returns an app config value by key
 func TriggerConfigGet(appName string, key string) error {