fix: allow escaping of commas in plugin list options (#142)

cmd/drone-docker-buildx/config.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"github.com/thegeeklab/drone-docker-buildx/plugin"
+	"github.com/thegeeklab/drone-plugin-lib/v2/drone"
 	"github.com/urfave/cli/v2"
 )
 
@@ -202,12 +203,12 @@ func settingsFlags(settings *plugin.Settings, category string) []cli.Flag {
 			Destination: &settings.Build.Target,
 			Category:    category,
 		},
-		&cli.StringSliceFlag{
-			Name:        "cache-from",
-			EnvVars:     []string{"PLUGIN_CACHE_FROM"},
-			Usage:       "images to consider as cache sources",
-			Destination: &settings.Build.CacheFrom,
-			Category:    category,
+		&cli.GenericFlag{
+			Name:     "cache-from",
+			EnvVars:  []string{"PLUGIN_CACHE_FROM"},
+			Usage:    "images to consider as cache sources",
+			Value:    &drone.StringSliceFlag{},
+			Category: category,
 		},
 		&cli.StringFlag{
 			Name:        "cache-to",

cmd/drone-docker-buildx/main.go

@@ -9,6 +9,7 @@ import (
 	"github.com/thegeeklab/drone-docker-buildx/plugin"
 	"github.com/urfave/cli/v2"
 
+	"github.com/thegeeklab/drone-plugin-lib/v2/drone"
 	"github.com/thegeeklab/drone-plugin-lib/v2/urfave"
 )
 
@@ -45,6 +46,8 @@ func run(settings *plugin.Settings) cli.ActionFunc {
 	return func(ctx *cli.Context) error {
 		urfave.LoggingFromContext(ctx)
 
+		settings.Build.CacheFrom = ctx.Generic("cache-from").(*drone.StringSliceFlag).Get()
+
 		plugin := plugin.New(
 			*settings,
 			urfave.PipelineFromContext(ctx),

plugin/docker.go

@@ -87,7 +87,7 @@ func commandBuild(build Build, dryrun bool) *exec.Cmd {
 	if build.NoCache {
 		args = append(args, "--no-cache")
 	}
-	for _, arg := range build.CacheFrom.Value() {
+	for _, arg := range build.CacheFrom {
 		args = append(args, "--cache-from", arg)
 	}
 	if build.CacheTo != "" {

plugin/impl.go

@@ -53,7 +53,7 @@ type Build struct {
 	ArgsEnv      cli.StringSlice // Docker build args from env
 	Target       string          // Docker build target
 	Pull         bool            // Docker build pull
-	CacheFrom    cli.StringSlice // Docker build cache-from
+	CacheFrom    []string        // Docker build cache-from
 	CacheTo      string          // Docker build cache-to
 	Compress     bool            // Docker build compress
 	Repo         string          // Docker build repository