1 files changed, 98 insertions, 0 deletions
diff --git a/cmd/hash.go b/cmd/hash.go
new file mode 100644
index 0000000..5185736
--- /dev/null
+++ b/cmd/hash.go
@@ -0,0 +1,98 @@
+/*
+Copyright © 2025 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"sync"
+
+	"github.com/scrotadamus/ghligh/document"
+	"github.com/spf13/cobra"
+)
+
+// hashCmd represents the hash command
+var hashCmd = &cobra.Command{
+	Use:   "hash",
+	Short: "display the ghligh hash used to identify a documet [json]",
+	Long: `the ghligh hash is used to identify documents with different filenames / annotations and it is calculated using the text of some pages.
+
+		ghligh hash file1.json file2.json [-i]
+
+		-i will indent the json output
+	`,
+	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) == 0 {
+			cmd.Help()
+			return
+		}
+		indent, err := cmd.Flags().GetBool("indent")
+		if err != nil {
+			cmd.Help()
+			return
+		}
+
+		//		var hashes []document.GhlighDoc
+		hashChan := make(chan document.GhlighDoc)
+		var wg sync.WaitGroup
+		wg.Add(len(args))
+
+		for _, arg := range args {
+			go func(arg string) {
+				defer wg.Done()
+				doc, err := document.Open(arg)
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "error opening %s: %v\n", arg, err)
+					return
+				}
+
+				// A little hacky, set hash after closing the document
+				//doc.Close()
+				doc.HashBuffer = doc.HashDoc()
+
+				hashChan <- *doc
+			}(arg)
+		}
+
+		go func() {
+			wg.Wait()
+			close(hashChan)
+		}()
+
+		var hashes []document.GhlighDoc
+		for doc := range hashChan {
+			hashes = append(hashes, doc)
+			doc.Close()
+		}
+
+		var jsonBytes []byte
+		if indent {
+			jsonBytes, err = json.MarshalIndent(hashes, "", "	")
+		} else {
+			jsonBytes, err = json.Marshal(hashes)
+		}
+		if err != nil {
+			panic(err)
+		}
+		fmt.Println(string(jsonBytes))
+
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(hashCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// hashCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// hashCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+	hashCmd.Flags().BoolP("indent", "i", false, "indent the json data")
+}