update: log parser dir to input scanning

23-input-scanning/01-scanning/main.go

@@ -0,0 +1,41 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	// Create a new scanner that scans from the standard-input
+	in := bufio.NewScanner(os.Stdin)
+
+	// Simulate an error
+	// os.Stdin.Close()
+
+	// Stores the total number of lines in the input
+	var lines int
+
+	// Scan the input line by line
+	for in.Scan() {
+		lines++
+
+		// Get the current line from the scanner's buffer
+		// fmt.Println("Scanned Text :", in.Text())
+		// fmt.Println("Scanned Bytes:", in.Bytes())
+		in.Text()
+	}
+	fmt.Printf("There %d lines.\n", lines)
+
+	err := in.Err()
+	if err != nil {
+		fmt.Println("ERROR:", err)
+	}
+}

23-input-scanning/01-scanning/proverbs.txt

@@ -0,0 +1,4 @@
+Go Proverbs
+Make the zero value useful
+Clear is better than clever
+Errors are values

23-input-scanning/02-map-as-sets/main.go

@@ -0,0 +1,44 @@
+package main
+
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) != 1 {
+		fmt.Println("Please type a search word.")
+		return
+	}
+	query := args[0]
+
+	in := bufio.NewScanner(os.Stdin)
+	in.Split(bufio.ScanWords)
+
+	// index the words
+	words := make(map[string]bool)
+	for in.Scan() {
+		words[in.Text()] = true
+	}
+
+	// unnecessary
+	// if _, ok := words[query]; ok {
+	// ...
+	// }
+
+	// answer the user query
+	if words[query] {
+		fmt.Printf("The input contains %q word.\n", query)
+		return
+	}
+	fmt.Printf("Sorry. The input does contain %q word.\n", query)
+}

23-input-scanning/02-map-as-sets/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/03-project-log-parser/log.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org 4
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/03-project-log-parser/log_err_missing.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/03-project-log-parser/log_err_negative.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org -100
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/03-project-log-parser/log_err_str.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org FOUR
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/03-project-log-parser/main.go

@@ -0,0 +1,78 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var (
+		sum     map[string]int // total visits per domain
+		domains []string       // unique domain names
+		total   int            // total visits to all domains
+		lines   int            // number of parsed lines (for the error messages)
+	)
+
+	sum = make(map[string]int)
+
+	// Scan the standard-in line by line
+	in := bufio.NewScanner(os.Stdin)
+	for in.Scan() {
+		lines++
+
+		// Parse the fields
+		fields := strings.Fields(in.Text())
+		if len(fields) != 2 {
+			fmt.Printf("wrong input: %v (line #%d)\n", fields, lines)
+			return
+		}
+
+		domain := fields[0]
+
+		// Sum the total visits per domain
+		visits, err := strconv.Atoi(fields[1])
+		if visits < 0 || err != nil {
+			fmt.Printf("wrong input: %q (line #%d)\n", fields[1], lines)
+			return
+		}
+
+		// Collect the unique domains
+		if _, ok := sum[domain]; !ok {
+			domains = append(domains, domain)
+		}
+
+		// Keep track of total and per domain visits
+		total += visits
+		sum[domain] += visits
+	}
+
+	// Print the visits per domain
+	sort.Strings(domains)
+
+	fmt.Printf("%-30s %10s\n", "DOMAIN", "VISITS")
+	fmt.Println(strings.Repeat("-", 45))
+
+	for _, domain := range domains {
+		visits := sum[domain]
+		fmt.Printf("%-30s %10d\n", domain, visits)
+	}
+
+	// Print the total visits for all domains
+	fmt.Printf("\n%-30s %10d\n", "TOTAL", total)
+
+	// Let's handle the error
+	if err := in.Err(); err != nil {
+		fmt.Println("> Err:", err)
+	}
+}

23-input-scanning/exercises/01-uppercaser/main.go

@@ -0,0 +1,20 @@
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Uppercaser
+//
+//  Use a scanner to convert the lines to uppercase, and
+//  print them.
+//
+//  1. Feed the shakespeare.txt to your program.
+//
+//  2. Scan the input using a new Scanner.
+//
+//  3. Print each line.
+//
+// EXPECTED OUTPUT
+//  Please run the solution to see the expected output.
+// ---------------------------------------------------------
+
+func main() {
+}

23-input-scanning/exercises/01-uppercaser/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/01-uppercaser/solution/main.go

@@ -0,0 +1,23 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+
+	for in.Scan() {
+		fmt.Println(strings.ToUpper(in.Text()))
+	}
+}

23-input-scanning/exercises/01-uppercaser/solution/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/02-unique-words/main.go

@@ -0,0 +1,29 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Unique Words
+//
+//  Create a program that counts the unique words from an
+//  input stream.
+//
+//  1. Feed the shakespeare.txt to your program.
+//
+//  2. Scan the input using a new Scanner.
+//
+//  3. Configure the scanner to scan for the words.
+//
+//  4. Count the unique words using a map.
+//
+// EXPECTED OUTPUT
+//  There are 99 words, 70 of them are unique.
+// ---------------------------------------------------------
+
+func main() {
+}

23-input-scanning/exercises/02-unique-words/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/02-unique-words/solution/main.go

@@ -0,0 +1,27 @@
+package main
+
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+	in.Split(bufio.ScanWords)
+
+	total, words := 0, make(map[string]int)
+	for in.Scan() {
+		total++
+		words[in.Text()]++
+	}
+	fmt.Printf("There are %d words, %d of them are unique.\n",
+		total, len(words))
+}

23-input-scanning/exercises/02-unique-words/solution/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/03-grep/main.go

@@ -0,0 +1,25 @@
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Grep Clone
+//
+//  Create a grep clone. grep is a command-line utility for
+//  searching plain-text data for lines that match a specific
+//  pattern.
+//
+//  1. Feed the shakespeare.txt to your program.
+//
+//  2. Accept a command-line argument for the pattern
+//
+//  3. Only print the lines that contains that pattern
+//
+//  4. If no pattern is provided, print all the lines
+//
+// EXPECTED OUTPUT
+//  go run main.go come < shakespeare.txt
+//    come night come romeo come thou day in night
+//    come gentle night come loving black-browed night
+// ---------------------------------------------------------
+
+func main() {
+}

23-input-scanning/exercises/03-grep/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/03-grep/solution/main.go

@@ -0,0 +1,31 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+
+	var pattern string
+	if args := os.Args[1:]; len(args) == 1 {
+		pattern = args[0]
+	}
+
+	for in.Scan() {
+		s := in.Text()
+		if strings.Contains(s, pattern) {
+			fmt.Println(s)
+		}
+	}
+}

23-input-scanning/exercises/03-grep/solution/shakespeare.txt

@@ -0,0 +1,12 @@
+come night come romeo come thou day in night
+for thou wilt lie upon the wings of night
+whiter than new snow on a raven's back
+come gentle night come loving black-browed night
+give me my romeo and when he shall die
+take him and cut him out in little stars
+and he will make the face of heaven so fine
+that all the world will be in love with night
+and pay no worship to the garish sun
+oh i have bought the mansion of love
+but not possessed it and though i am sold
+not yet enjoyed

23-input-scanning/exercises/README.md

@@ -0,0 +1,15 @@
+# Exercises
+
+Let's exercise with the scanner and maps.
+
+1. **[Uppercaser](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/01-uppercaser)**
+
+  Use a scanner to convert the lines to uppercase, and print them.
+   
+2. **[Unique Words](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/02-unique-words)**
+
+  Create a program that counts the unique words from an input stream.
+
+3. **[Grep Clone](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/03-grep)**
+
+  Create a grep clone. grep is a command-line utility for searching plain-text data for lines that match a specific pattern.