Go R1 Day 10 - Sheldon Hull

Day 10 of 100

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Experimented with CLI tool using go-prompt
Customized initial options
OS independent call to get user home directory.
Iterated through a directory listing
Used path join to initialize path for directory search.
One challenge in working with structs being returned was figuring out how to print the values of the struct. Initially, I only had pointers to the values coming back. This made sense, though, as I watched a tutorial this weekend on slices, and better understand that a slice is actually a small data structure being described by: pointer to the location in memory, length, and the capacity of the slice. Without this tutorial, I think seeing the pointer addresses coming through would have been pretty confusing.
In reading StackOverflow, I realized it’s a “slice of interfaces”.
Worked with apex logger and moved some of the log output to debug level logging.
Final result

source

Code

package main

import (
	// "fmt"

	"github.com/c-bata/go-prompt"
	// pretty "github.com/inancgumus/prettyslice"
	"io/ioutil"

	"github.com/common-nighthawk/go-figure"
	"github.com/mitchellh/go-homedir"
	"github.com/olekukonko/tablewriter"

	// "log"
	"os"
	"path"

	"github.com/apex/log"
	"github.com/apex/log/handlers/text"
)

func ListDirectories(dir string) ([]os.FileInfo, error) {
	dirList, err := ioutil.ReadDir(dir)
	if err != nil {
		log.Fatalf("Failed to ReadDir: %s", err)

		return nil, err
	}

	return dirList, nil
}
func completer(d prompt.Document) []prompt.Suggest {
	s := []prompt.Suggest{
		{Text: "sheldonhull", Description: "my personal github repos"},
		{Text: "github", Description: "General cloned repos from github"},
	}
	return prompt.FilterHasPrefix(s, d.GetWordBeforeCursor(), true)
}
func RenderDirectoryTable(f []os.FileInfo) {

	table := tablewriter.NewWriter(os.Stdout)
	table.SetHeader([]string{"Name"})
	for _, file := range f {
		table.Append([]string{file.Name()})
	}
	// table.AppendBulk(f)
	table.Render() // Send output
}
func Title() {
	myFigure := figure.NewColorFigure("FooBar", "", "green", true)
	myFigure.Print()
}
func main() {
	log.SetHandler(text.New(os.Stderr))

	Title()
	log.Infof("Please select table.")
	t := prompt.Input("> ", completer, prompt.OptionShowCompletionAtStart())
	log.Infof("You selected " + t)

	d, err := homedir.Dir()
	if err != nil {
		log.Fatalf("Failed to parse user home directory: %s", err)
	}
	log.Infof("User Directory: %s", d)
	dirPath := path.Join(d, "git", t)
	log.Infof("The path join value is: %s", dirPath)
	dl, err := ListDirectories(dirPath)
	if err != nil {
		log.Fatalf("Error in ListDirectories: %s", err)
	}
	// pretty.Show("The resulting directories", dl)

	// fmt.Infof("The resulting directories: %+v\n", dl)
	// fmt.Infof("The resulting directories: %s\n", dl.Name())  // doesn't work as slice of interfaces
	// This works as it uses the function to get name
	for _, i := range dl {
		log.Debugf("%s\n", i.Name())
	}
	RenderDirectoryTable(dl)
	// ListDirectories(t)
}

Day 10 of 100

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