uniq working

uniq/.gitignore

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+uniq
+uniq.exe

uniq/Makefile

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+
+
+build:
+	go build .

uniq/go.mod

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+module lcthw.dev/go/go-coreutils/uniq
+
+go 1.25.3

uniq/main.go

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+package main
+
+import (
+  "fmt"
+  "os"
+  "bufio"
+  "strings"
+  "flag"
+)
+type Opts struct {
+  IgnoreCase bool
+  Count bool
+}
+
+
+func parse_opts() Opts {
+  var opts Opts
+
+  flag.BoolVar(&opts.IgnoreCase, "i", false, "ignore case")
+  flag.BoolVar(&opts.Count, "c", false, "count occurence")
+  flag.Parse()
+
+  return opts
+}
+
+func string_equal(a string, b string, ignore_case bool) bool {
+  if ignore_case {
+    a = strings.ToLower(a)
+    b = strings.ToLower(b)
+  }
+
+  return strings.Compare(a, b) == 0
+}
+
+func main() {
+  scan := bufio.NewScanner(os.Stdin)
+  seen_line := ""
+  seen_count := 0
+  opts := parse_opts()
+
+  for scan.Scan() {
+    line := scan.Text()
+
+    if !string_equal(line, seen_line, opts.IgnoreCase) {
+      if opts.Count {
+        fmt.Print(seen_count, " ")
+      }
+
+      fmt.Println(line)
+
+      seen_line = line
+      seen_count = 0
+    } else {
+      seen_count++
+    }
+  }
+}

uniq/test.txt

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+head
+numfmt
+od
+sha512sum
+sort
+starter
+starter
+starter
+LICENSE
+license
+LICENSE
+outline.txt
+README.md
+stat
+tail
+tail
+tail
+tail
+tr
+uniq
+uniq
+uniq
+uniq
+cat
+cat
+cat
+cat
+date
+du
+wc
+.gitignore