add: log parser exercises

23-project-log-parser/exercises/01-uppercaser/main.go

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+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-project-log-parser/exercises/01-uppercaser/shakespeare.txt

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+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-project-log-parser/exercises/01-uppercaser/solution/main.go

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+// 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-project-log-parser/exercises/01-uppercaser/solution/shakespeare.txt

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+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-project-log-parser/exercises/02-unique-words/main.go

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+// 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.
+//     See the explanation inside the code below.
+//
+//  4. Count the unique words using a map.
+//
+// EXPECTED OUTPUT
+//  There are 99 words, 70 of them are unique.
+// ---------------------------------------------------------
+
+func main() {
+	// Scanner can scan the lines, words, anything.
+	// Use the following code after creating the scanner to
+	// scan for the words instead.
+	//
+	// Below, I assumed that you put your scanner into the "in" variable.
+
+	// in.Split(bufio.ScanWords)
+}

23-project-log-parser/exercises/02-unique-words/shakespeare.txt

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+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-project-log-parser/exercises/02-unique-words/solution/main.go

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+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-project-log-parser/exercises/02-unique-words/solution/shakespeare.txt

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+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-project-log-parser/exercises/03-grep/main.go

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+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-project-log-parser/exercises/03-grep/shakespeare.txt

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+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-project-log-parser/exercises/03-grep/solution/main.go

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+// 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-project-log-parser/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-project-log-parser/exercises/README.md

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+# 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.