Added nim filter type

regolith/filters.go

@@ -22,6 +22,7 @@ func RegisterFilters() {
 	RegisterNodeJSFilter(FilterTypes)
 	RegisterShellFilter(FilterTypes)
 	RegisterJavaFilter(FilterTypes)
+	RegisterNimFilter(FilterTypes)
 }
 
 // RunFilter determine whether the filter is remote, standard (from standard

regolith/nim_filter.go

@@ -0,0 +1,74 @@
+package regolith
+
+import (
+	"encoding/json"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+const nimFilterName = "nim"
+
+func RegisterNimFilter(filters map[string]filterDefinition) {
+	filters[nimFilterName] = filterDefinition{
+		filter:  runNimFilter,
+		install: installNimFilter,
+		check:   checkNimRequirements,
+	}
+}
+
+func runNimFilter(filter Filter, settings map[string]interface{}, absoluteLocation string) error {
+	if len(settings) == 0 {
+		err := RunSubProcess("nim", append([]string{"-r", "c", "--hints:off", "--warnings:off", absoluteLocation + string(os.PathSeparator) + filter.Script}, filter.Arguments...), absoluteLocation, GetAbsoluteWorkingDirectory())
+		if err != nil {
+			return wrapError("Failed to run Nim script", err)
+		}
+	} else {
+		jsonSettings, _ := json.Marshal(settings)
+		err := RunSubProcess("nim", append([]string{"-r", "c", "--hints:off", "--warnings:off", absoluteLocation + string(os.PathSeparator) + filter.Script, string(jsonSettings)}, filter.Arguments...), absoluteLocation, GetAbsoluteWorkingDirectory())
+		if err != nil {
+			return wrapError("Failed to run Nim script", err)
+		}
+	}
+	return nil
+}
+
+func installNimFilter(filter Filter, filterPath string) error {
+	if hasNimble(filterPath) {
+		Logger.Info("Installing nim dependencies...")
+		err := RunSubProcess("nimble", []string{"install"}, filterPath, filterPath)
+		if err != nil {
+			return wrapError("Failed to run nimble", err)
+		}
+	}
+	return nil
+}
+
+func hasNimble(filterPath string) bool {
+	nimble := false
+	filepath.Walk(filterPath, func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			return nil
+		}
+		if filepath.Ext(path) == ".nimble" {
+			nimble = true
+		}
+		return nil
+	})
+	return nimble
+}
+
+func checkNimRequirements() error {
+	_, err := exec.LookPath("nim")
+	if err != nil {
+		Logger.Fatal("Nim not found. Download and install it from https://nim-lang.org/")
+	}
+	cmd, err := exec.Command("nim", "--version").Output()
+	if err != nil {
+		return wrapError("Failed to check Nim version", err)
+	}
+	a := strings.TrimPrefix(strings.Trim(string(cmd), " \n\t"), "v")
+	Logger.Debugf("Found Nim version %s", a)
+	return nil
+}