Implement cli argument for file path, path validation, file type validation

internal/convert/mdToHtml.go

@@ -0,0 +1,22 @@
+package convert
+
+import (
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+)
+
+// This function takes a Markdown document and returns an HTML document.
+func MdToHTML(md []byte) ([]byte, error) {
+	// create parser with extensions
+	extensions := parser.CommonExtensions | parser.AutoHeadingIDs | parser.NoEmptyLineBeforeBlock
+	p := parser.NewWithExtensions(extensions)
+	doc := p.Parse(md)
+
+	// build HTML renderer
+	htmlFlags := html.CommonFlags | html.HrefTargetBlank
+	opts := html.RendererOptions{Flags: htmlFlags}
+	renderer := html.NewRenderer(opts)
+
+	return markdown.Render(doc, renderer), nil
+}

internal/util/path.go

@@ -0,0 +1,33 @@
+// Package util provides general utilities.
+package util
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+)
+
+// CheckExtension checks if the file located at path (string)
+// matches the provided extension type
+func CheckExtension(path, ext string) error {
+	if filepath.Ext(path) == ext {
+		return nil
+	} else {
+		return errors.New("Invalid extension.")
+	}
+}
+
+// PathIsValid checks if a path is valid.
+// If requireFile is set, directories are not considered valid.
+func PathIsValid(path string, requireFile bool) bool {
+	s, err := os.Stat(path)
+	if os.IsNotExist(err) {
+		return false
+	} else if requireFile {
+		fmt.Printf("Directory status: %s\n", strconv.FormatBool(s.IsDir()))
+		return !s.IsDir()
+	}
+	return err == nil
+}