Basic working utility. Needs refinement

cdhist.go

@@ -1,9 +1,76 @@
 package main
 
-func histAdd() {
+import (
+	"fmt"
+	"log"
+	"os"
+	"io"
+	"bufio"
+)
+
+func histAdd(histFile string, path string) (error) {
+
+	data, err := ReadLines(histFile)
+	if err != nil {
+		if os.IsNotExist(err) != true {
+			log.Printf("Error reading cd history file: %v", err)
+		}
+	}
+	data = append(data, path)
+ 	file, err := os.OpenFile(histFile, os.O_RDWR|os.O_CREATE, 0660)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	for _, line := range data {
+		 _, err := file.Write([]byte(fmt.Sprintf("%s\n", line)))
+		 if err != nil {
+			 log.Printf("Error writing cd history file: %v", err)
+			 return err
+		}
+	 }
+	return err
+}
+
+func histList(histFile string) {
+	fmt.Println("List")
+
 	return
 }
 
-func histList() {
+func ReadLines(fileName string) (data []string, err error) {
+	file, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0660)
+	if err != nil {
+	//	log.Print(err)
+		return nil, err
+	}
+	defer file.Close()
+
+	reader := bufio.NewReader(file)
+	var paths []string
+	for {
+		line, _, err := reader.ReadLine()
+		if err != nil {
+			if err == io.EOF {
+				err = nil
+			}
+			break
+		}
+		paths = append(paths, string(line))
+	}
+	return paths, err
+}
+
+// makeBashFunc prints the wrapper function to be sourced by bash
+func makeBashFunc() {
+//	fmt.Printf("cdh() { local d; d=$(cdhist-v2 \"$@\"); if [ $? -ne 0 ]; then return 0; fi; builtin cd -- \"$d\"; }")
+	fmt.Printf(`cdh() {
+	local d
+	d=$(cdhist-v2 "$@")
+	if [ $? -ne 0 ]; then return 0
+	fi
+	builtin cd -- "$d"
+	}`)
 	return
 }

go.mod

@@ -1,3 +1,3 @@
-module projects/cdhist-v2
+module projects/cdhist
 
 go 1.20

main.go

@@ -2,14 +2,42 @@ package main
 
 import (
 	"os"
+	// "os/exec"
+	"log"
+	"path"
+	// "syscall"
+	"fmt"
 )
 
-func main(){
-	if len(os.Args) > 1 && os.Args[1] == "add" {
-		histAdd()
-		return
+var (
+	histFile string = ".cd_history"
+)
+
+func main() {
+
+	histFileDir, err := os.UserHomeDir()
+	if err != nil {
+		log.Fatal(err, "Can't find home directory.")
+	}
+	histFile := path.Join(histFileDir, histFile)
+
+	 if len(os.Args) > 1 && os.Args[1] == "--" {
+	 	histList(histFile)
+	 	os.Exit(1)
+	 }
+
+	 if len(os.Args) > 1 && os.Args[1] == "-i" {
+		makeBashFunc()
+		os.Exit(1)
 	}
 
-	histList()
+	if len(os.Args) > 1 {
+		path := os.Args[1]
+	    histAdd(histFile, path)
+		fmt.Printf("%s", path)
+		os.Exit(0)
+	}
+
+
 	return
 }