From be54bf3e7d88a889d05dc5849cb334a872e2d2fd Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Tue, 21 Oct 2025 11:43:17 -0400
Subject: [PATCH] Sort is now working.

---
 sort/.gitignore |  2 ++
 sort/Makefile   |  4 +++
 sort/go.mod     |  3 +++
 sort/main.go    | 66 +++++++++++++++++++++++++++++++++++++++++++++++++
 sort/test.txt   | 18 ++++++++++++++
 5 files changed, 93 insertions(+)
 create mode 100644 sort/.gitignore
 create mode 100644 sort/Makefile
 create mode 100644 sort/go.mod
 create mode 100644 sort/main.go
 create mode 100644 sort/test.txt

diff --git a/sort/.gitignore b/sort/.gitignore
new file mode 100644
index 0000000..e2fdc30
--- /dev/null
+++ b/sort/.gitignore
@@ -0,0 +1,2 @@
+sort
+sort.exe
diff --git a/sort/Makefile b/sort/Makefile
new file mode 100644
index 0000000..bea7546
--- /dev/null
+++ b/sort/Makefile
@@ -0,0 +1,4 @@
+
+
+build:
+	go build .
diff --git a/sort/go.mod b/sort/go.mod
new file mode 100644
index 0000000..64676b8
--- /dev/null
+++ b/sort/go.mod
@@ -0,0 +1,3 @@
+module lcthw.dev/go/go-coreutils/sort
+
+go 1.25.3
diff --git a/sort/main.go b/sort/main.go
new file mode 100644
index 0000000..d832321
--- /dev/null
+++ b/sort/main.go
@@ -0,0 +1,66 @@
+package main
+
+import (
+  "fmt"
+  "bufio"
+  "os"
+  "slices"
+  "flag"
+  "strings"
+  "strconv"
+)
+
+type Opts struct {
+  IgnoreCase bool
+  Numeric bool
+}
+
+func parse_opts() Opts {
+  var opts Opts
+
+  flag.BoolVar(&opts.IgnoreCase, "f", false, "ignore case")
+  flag.BoolVar(&opts.Numeric, "n", false, "numeric sort")
+
+  flag.Parse()
+
+  return opts
+}
+
+func numeric_sort(a string, b string) int {
+  a_int, a_err := strconv.Atoi(a)
+  b_int, b_err := strconv.Atoi(b)
+
+  if a_err != nil || b_err != nil {
+    return strings.Compare(a, b)
+  } else {
+    return a_int - b_int
+  }
+}
+
+func ignore_case_sort(a string, b string) int {
+  return strings.Compare(strings.ToLower(a), strings.ToLower(b))
+}
+
+func main() {
+  lines := make([]string, 0, 100)
+  opts := parse_opts()
+
+  scan := bufio.NewScanner(os.Stdin)
+
+  for scan.Scan() {
+    line := scan.Text()
+    lines = append(lines, line)
+  }
+
+  if opts.Numeric {
+    slices.SortFunc(lines, numeric_sort)
+  } else if opts.IgnoreCase{
+    slices.SortFunc(lines, ignore_case_sort)
+  } else {
+    slices.Sort(lines)
+  }
+
+  for _, line := range lines {
+    fmt.Println(line)
+  }
+}
diff --git a/sort/test.txt b/sort/test.txt
new file mode 100644
index 0000000..224008c
--- /dev/null
+++ b/sort/test.txt
@@ -0,0 +1,18 @@
+head
+numfmt
+od
+sha512sum
+sort
+starter
+LICENSE
+outline.txt
+README.md
+stat
+tail
+tr
+uniq
+cat
+date
+du
+wc
+.gitignore