From 368fb6407dfe182613bc1842400030fd3a158180 Mon Sep 17 00:00:00 2001
From: sneak <sneak@sneak.berlin>
Date: Wed, 22 May 2024 14:36:15 -0700
Subject: [PATCH] initial

---
 .gitignore |  1 +
 go.mod     |  3 +++
 main.go    | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 go.mod
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dd686ca
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+field
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9130c17
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module sneak.berlin/go/field
+
+go 1.22.2
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..68ddde3
--- /dev/null
+++ b/main.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintf(os.Stderr, "usage: %s <field-number>", os.Args[0])
+		os.Exit(1)
+	}
+
+	fieldNum, err := strconv.Atoi(os.Args[1])
+	if err != nil || fieldNum < 1 {
+		fmt.Fprintln(os.Stderr, "invalid field number:", os.Args[1])
+		os.Exit(1)
+	}
+
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		line := scanner.Text()
+		fields := strings.Fields(line)
+		if len(fields) >= fieldNum {
+			fmt.Println(fields[fieldNum-1])
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintln(os.Stderr, "error reading input:", err)
+	}
+}