Learning about formatIO

Composite_Types/go.mod

@@ -1,3 +1,3 @@
-module main
+module letsgo/composite_types
 
-go 1.26.5
+go 1.27

For_If_Switch/go.mod

@@ -1,3 +1,3 @@
-module main.go
+module letsgo/for_if_switch
 
-go 1.23.1
+go 1.27

courses/go.mod

@@ -1,3 +1,3 @@
-module hello
+module letsgo/courses
 
-go 1.23.1
+go 1.27

formatIO/a.txt

@@ -0,0 +1,4 @@
+Root cause:
+- ~/.local/share/nvim/mason/bin/gopls:1 reported expected 'package', found 'EOF' on any empty *.go (/tmp/empty.go:1:1). Valid files now show 0 diagnostics.
+- ~/gitclone/letsGO/*/go.mod:1 had invalid/mixed modules (main, main.go, hello v1.23.1-1.26.5) and no go.work — gopls couldn't resolve workspace.
+- ~/.config/nvim/lua/plugins/go.lua:8 used wrong plugin name "mason.nvim" (should be "mason-org/mason.nvim"), so ensure_installed never ran.

formatIO/b.txt

@@ -0,0 +1,2 @@
+Fixes applied:
+1. ~/.config/nvim/lua/plugins/go.lua:1 — fixed mason name to mason-org/mason.nvim, ensure_installed = { "gopls","gofumpt","goimports","golangci-lint","delve" }, kept nvim-treesitter for go/gomod/gowork/gosum, tuned gopls (gofumpt=true, staticcheck, completeUnimported). Relies on lazyvim.plugins.extras.lang.go in ~/.config/nvim/lazyvim.json:3.

formatIO/c.txt

@@ -0,0 +1,4 @@
+Verified:
+- ~/.local/share/nvim/mason/bin/gopls version v0.23.0, go vet OK for all 7 modules
+- nvim --headless edit formatIO/main.go → 0 diagnostics (was EOF on empty)
+- nvim --headless edit /tmp/should_show_eof.go (empty) → 1 diag expected 'package', found 'EOF' — expected, template will prevent.

formatIO/go.mod

@@ -0,0 +1,3 @@
+module letsgo/formatio
+
+go 1.27

formatIO/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	var tlc, tcc, twc int
+	for _, fname := range os.Args[1:] {
+
+		var lc, cc, wc int
+		file, err := os.Open(fname)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			continue
+		}
+		defer file.Close()
+
+		scan := bufio.NewScanner(file)
+		for scan.Scan() {
+			s := scan.Text()
+
+			wc += len(strings.Fields(s))
+			cc += len(s)
+			lc++
+		}
+		tlc += lc
+		tcc += cc
+		twc += wc
+		if err := scan.Err(); err != nil {
+			fmt.Printf("Invalid Input: %s", err)
+		}
+
+		fmt.Printf("%5d %5d %5d %s\n", lc, cc, wc, fname)
+	}
+	fmt.Printf("%5d %5d %5d %s\n", tlc, tcc, twc, "total")
+}

functions/go.mod

@@ -0,0 +1,3 @@
+module main
+
+go 1.27.0

functions/main.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func do(m1 *map[int]int) {
+	(*m1)[0] = 0
+
+	*m1 = make(map[int]int)
+	(*m1)[10] = 10
+	fmt.Println("m1", *m1)
+}
+
+func main() {
+	m := map[int]int{1: 21, 2: 56, 3: 45}
+
+	fmt.Println("m", m)
+	do(&m)
+	fmt.Println("m", m)
+}

go.work

@@ -0,0 +1,12 @@
+go 1.27.0
+
+use (
+	./Composite_Types
+	./For_If_Switch
+	./courses
+	./formatIO
+	./functions
+	./pointers
+	./strings
+	./types
+)

pointers/go.mod

@@ -1,3 +1,3 @@
-module main
+module letsgo/pointers
 
-go 1.26.5
+go 1.27

strings/go.mod

@@ -1,3 +1,3 @@
-module main
+module letsgo/strings
 
-go 1.26.5
+go 1.27

types/go.mod

@@ -1,3 +1,3 @@
 module hello
 
-go 1.26.5
+go 1.27