Implement getting color code for languages

Signed-off-by: Lauris Bukšis-Haberkorns <lauris@nix.lv>

internal/code-generator/generator/colors.go

@@ -0,0 +1,47 @@
+package generator
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+
+	"gopkg.in/yaml.v2"
+)
+
+// Colors generates a map in Go with language name -> color string.
+// It is of generator.File type.
+func Colors(fileToParse, samplesDir, outPath, tmplPath, tmplName, commit string) error {
+	data, err := ioutil.ReadFile(fileToParse)
+	if err != nil {
+		return err
+	}
+
+	languages := make(map[string]*languageInfo)
+	if err := yaml.Unmarshal(data, &languages); err != nil {
+		return err
+	}
+
+	langColorMap := buildLanguageColorMap(languages)
+
+	buf := &bytes.Buffer{}
+	if err := executeMimeTemplate(buf, langColorMap, tmplPath, tmplName, commit); err != nil {
+		return err
+	}
+
+	return formatedWrite(outPath, buf.Bytes())
+}
+
+func buildLanguageColorMap(languages map[string]*languageInfo) map[string]string {
+	langColorMap := make(map[string]string)
+	for lang, info := range languages {
+		if len(info.Color) != 0 {
+			langColorMap[lang] = info.Color
+		}
+	}
+
+	return langColorMap
+}
+
+func executeColorTemplate(out io.Writer, langColorMap map[string]string, tmplPath, tmplName, commit string) error {
+	return executeTemplate(out, tmplName, tmplPath, commit, nil, langColorMap)
+}