Re-vendor the canonical files from sneak/prompts at dd4027b (closes #112)

The shared files are fetched from sneak/prompts dd4027b, with this
repository's own entries after the shared content in .gitignore,
.editorconfig and .dockerignore.

Lint and tests are Dockerfile phases (golangci-lint v2.14.0, Debian Go
1.24.13) that the build stage depends on, and the Makefile targets call
the script/ entrypoints. make fmt also formats Markdown with prettier.

Fixes for the new lint findings: the auth cookie is always Secure, an
IRC connection's relay goroutine stops when the connection closes, and
repeated strings are constants.

Model: opus-5-5

internal/ircserver/parser_test.go

@@ -4,12 +4,18 @@ import (
 	"testing"
 
 	"sneak.berlin/go/neoirc/internal/ircserver"
+	"sneak.berlin/go/neoirc/pkg/irc"
 )
 
 //nolint:funlen // table-driven test
 func TestParseMessage(t *testing.T) {
 	t.Parallel()
 
+	const (
+		nick    = "alice"
+		channel = "#general"
+	)
+
 	tests := []struct {
 		name    string
 		input   string
@@ -24,10 +30,10 @@ func TestParseMessage(t *testing.T) {
 		},
 		{
 			name:  "simple command",
-			input: "PING",
+			input: irc.CmdPing,
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "PING",
+				Command: irc.CmdPing,
 				Params:  nil,
 			},
 			wantNil: false,
@@ -38,7 +44,7 @@ func TestParseMessage(t *testing.T) {
 			want: &ircserver.Message{
 				Prefix:  "",
 				Command: "NICK",
-				Params:  []string{"alice"},
+				Params:  []string{nick},
 			},
 			wantNil: false,
 		},
@@ -57,8 +63,8 @@ func TestParseMessage(t *testing.T) {
 			input: "PRIVMSG #general :hello world",
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "PRIVMSG",
-				Params:  []string{"#general", "hello world"},
+				Command: irc.CmdPrivmsg,
+				Params:  []string{channel, "hello world"},
 			},
 			wantNil: false,
 		},
@@ -68,7 +74,7 @@ func TestParseMessage(t *testing.T) {
 			want: &ircserver.Message{
 				Prefix:  "server.example.com",
 				Command: "001",
-				Params:  []string{"alice", "Welcome to IRC"},
+				Params:  []string{nick, "Welcome to IRC"},
 			},
 			wantNil: false,
 		},
@@ -79,7 +85,7 @@ func TestParseMessage(t *testing.T) {
 				Prefix:  "",
 				Command: "USER",
 				Params: []string{
-					"alice", "0", "*", "Alice Smith",
+					nick, "0", "*", "Alice Smith",
 				},
 			},
 			wantNil: false,
@@ -90,7 +96,7 @@ func TestParseMessage(t *testing.T) {
 			want: &ircserver.Message{
 				Prefix:  "",
 				Command: "JOIN",
-				Params:  []string{"#general"},
+				Params:  []string{channel},
 			},
 			wantNil: false,
 		},
@@ -99,17 +105,17 @@ func TestParseMessage(t *testing.T) {
 			input: "QUIT :leaving now",
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "QUIT",
+				Command: irc.CmdQuit,
 				Params:  []string{"leaving now"},
 			},
 			wantNil: false,
 		},
 		{
 			name:  "quit without reason",
-			input: "QUIT",
+			input: irc.CmdQuit,
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "QUIT",
+				Command: irc.CmdQuit,
 				Params:  nil,
 			},
 			wantNil: false,
@@ -120,7 +126,7 @@ func TestParseMessage(t *testing.T) {
 			want: &ircserver.Message{
 				Prefix:  "",
 				Command: "MODE",
-				Params:  []string{"#general"},
+				Params:  []string{channel},
 			},
 			wantNil: false,
 		},
@@ -131,7 +137,7 @@ func TestParseMessage(t *testing.T) {
 				Prefix:  "",
 				Command: "KICK",
 				Params: []string{
-					"#general", "bob", "misbehaving",
+					channel, "bob", "misbehaving",
 				},
 			},
 			wantNil: false,
@@ -141,8 +147,8 @@ func TestParseMessage(t *testing.T) {
 			input: "PRIVMSG #general :",
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "PRIVMSG",
-				Params:  []string{"#general", ""},
+				Command: irc.CmdPrivmsg,
+				Params:  []string{channel, ""},
 			},
 			wantNil: false,
 		},
@@ -161,7 +167,7 @@ func TestParseMessage(t *testing.T) {
 			input: "PING :irc.example.com",
 			want: &ircserver.Message{
 				Prefix:  "",
-				Command: "PING",
+				Command: irc.CmdPing,
 				Params:  []string{"irc.example.com"},
 			},
 			wantNil: false,
@@ -173,7 +179,7 @@ func TestParseMessage(t *testing.T) {
 				Prefix:  "",
 				Command: "TOPIC",
 				Params: []string{
-					"#general",
+					channel,
 					"Welcome to the channel!",
 				},
 			},
@@ -237,6 +243,12 @@ func TestParseMessage(t *testing.T) {
 func TestFormatMessage(t *testing.T) {
 	t.Parallel()
 
+	const (
+		nick       = "alice"
+		channel    = "#general"
+		serverName = "server"
+	)
+
 	tests := []struct {
 		name    string
 		prefix  string
@@ -247,35 +259,35 @@ func TestFormatMessage(t *testing.T) {
 		{
 			name:    "simple command",
 			prefix:  "",
-			command: "PING",
+			command: irc.CmdPing,
 			params:  nil,
-			want:    "PING",
+			want:    irc.CmdPing,
 		},
 		{
 			name:    "with prefix",
-			prefix:  "server",
+			prefix:  serverName,
 			command: "PONG",
-			params:  []string{"server"},
+			params:  []string{serverName},
 			want:    ":server PONG server",
 		},
 		{
 			name:    "privmsg with trailing",
 			prefix:  "alice!alice@host",
-			command: "PRIVMSG",
-			params:  []string{"#general", "hello world"},
+			command: irc.CmdPrivmsg,
+			params:  []string{channel, "hello world"},
 			want:    ":alice!alice@host PRIVMSG #general :hello world",
 		},
 		{
 			name:    "numeric reply",
-			prefix:  "server",
+			prefix:  serverName,
 			command: "001",
-			params:  []string{"alice", "Welcome to IRC"},
+			params:  []string{nick, "Welcome to IRC"},
 			want:    ":server 001 alice :Welcome to IRC",
 		},
 		{
 			name:    "empty trailing",
-			prefix:  "server",
-			command: "PRIVMSG",
+			prefix:  serverName,
+			command: irc.CmdPrivmsg,
 			params:  []string{"#chan", ""},
 			want:    ":server PRIVMSG #chan :",
 		},
@@ -302,7 +314,7 @@ func TestParseFormatRoundTrip(t *testing.T) {
 	// parameter either contains a space (gets ':' prefix
 	// on format) or is a non-trailing single token.
 	lines := []string{
-		"PING",
+		irc.CmdPing,
 		"NICK alice",
 		"PRIVMSG #general :hello world",
 		"JOIN #general",