feat: Make goose annotations case-insensitive

internal/sqlparser/parser.go

@@ -121,13 +121,19 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 		if stateMachine.get() == start && strings.TrimSpace(line) == "" {
 			continue
 		}
-		// TODO(mf): validate annotations to avoid common user errors:
-		// https://github.com/pressly/goose/issues/163#issuecomment-501736725
-		if strings.HasPrefix(line, "--") {
-			cmd := strings.TrimSpace(strings.TrimPrefix(line, "--"))
+
+		// Check for annotations.
+		// All annotations must be in format: "-- +goose [annotation]"
+		if strings.HasPrefix(strings.TrimSpace(line), "--") && strings.Contains(line, "+goose") {
+			var cmd annotation
+
+			cmd, err = extractAnnotation(line)
+			if err != nil {
+				return nil, false, fmt.Errorf("failed to parse annotation line %q: %w", line, err)
+			}
 
 			switch cmd {
-			case "+goose Up":
+			case annotationUp:
 				switch stateMachine.get() {
 				case start:
 					stateMachine.set(gooseUp)
@@ -136,7 +142,7 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 				}
 				continue
 
-			case "+goose Down":
+			case annotationDown:
 				switch stateMachine.get() {
 				case gooseUp, gooseStatementEndUp:
 					// If we hit a down annotation, but the buffer is not empty, we have an unfinished SQL query from a
@@ -151,7 +157,7 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 				}
 				continue
 
-			case "+goose StatementBegin":
+			case annotationStatementBegin:
 				switch stateMachine.get() {
 				case gooseUp, gooseStatementEndUp:
 					stateMachine.set(gooseStatementBeginUp)
@@ -162,7 +168,7 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 				}
 				continue
 
-			case "+goose StatementEnd":
+			case annotationStatementEnd:
 				switch stateMachine.get() {
 				case gooseStatementBeginUp:
 					stateMachine.set(gooseStatementEndUp)
@@ -172,17 +178,20 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 					return nil, false, errors.New("'-- +goose StatementEnd' must be defined after '-- +goose StatementBegin', see https://github.com/pressly/goose#sql-migrations")
 				}
 
-			case "+goose NO TRANSACTION":
+			case annotationNoTransaction:
 				useTx = false
 				continue
 
-			case "+goose ENVSUB ON":
+			case annotationEnvsubOn:
 				useEnvsub = true
 				continue
 
-			case "+goose ENVSUB OFF":
+			case annotationEnvsubOff:
 				useEnvsub = false
 				continue
+
+			default:
+				return nil, false, fmt.Errorf("unknown annotation: %q", cmd)
 			}
 		}
 		// Once we've started parsing a statement the buffer is no longer empty,
@@ -277,6 +286,70 @@ func ParseSQLMigration(r io.Reader, direction Direction, debug bool) (stmts []st
 	return stmts, useTx, nil
 }
 
+type annotation string
+
+const (
+	annotationUp             annotation = "Up"
+	annotationDown           annotation = "Down"
+	annotationStatementBegin annotation = "StatementBegin"
+	annotationStatementEnd   annotation = "StatementEnd"
+	annotationNoTransaction  annotation = "NO TRANSACTION"
+	annotationEnvsubOn       annotation = "ENVSUB ON"
+	annotationEnvsubOff      annotation = "ENVSUB OFF"
+)
+
+var supportedAnnotations = map[annotation]struct{}{
+	annotationUp:             {},
+	annotationDown:           {},
+	annotationStatementBegin: {},
+	annotationStatementEnd:   {},
+	annotationNoTransaction:  {},
+	annotationEnvsubOn:       {},
+	annotationEnvsubOff:      {},
+}
+
+var (
+	errEmptyAnnotation   = errors.New("empty annotation")
+	errInvalidAnnotation = errors.New("invalid annotation")
+)
+
+// extractAnnotation extracts the annotation from the line.
+// All annotations must be in format: "-- +goose [annotation]"
+// Allowed annotations: Up, Down, StatementBegin, StatementEnd, NO TRANSACTION, ENVSUB ON, ENVSUB OFF
+func extractAnnotation(line string) (annotation, error) {
+	// If line contains leading whitespace - return error.
+	if strings.HasPrefix(line, " ") || strings.HasPrefix(line, "\t") {
+		return "", fmt.Errorf("%q contains leading whitespace: %w", line, errInvalidAnnotation)
+	}
+
+	// Extract the annotation from the line, by removing the leading "--"
+	cmd := strings.ReplaceAll(line, "--", "")
+
+	// Extract the annotation from the line, by removing the leading "+goose"
+	cmd = strings.Replace(cmd, "+goose", "", 1)
+
+	if strings.Contains(cmd, "+goose") {
+		return "", fmt.Errorf("%q contains multiple '+goose' annotations: %w", cmd, errInvalidAnnotation)
+	}
+
+	// Remove leading and trailing whitespace from the annotation command.
+	cmd = strings.TrimSpace(cmd)
+
+	if cmd == "" {
+		return "", errEmptyAnnotation
+	}
+
+	a := annotation(cmd)
+
+	for s := range supportedAnnotations {
+		if strings.EqualFold(string(s), string(a)) {
+			return s, nil
+		}
+	}
+
+	return "", fmt.Errorf("%q not supported: %w", cmd, errInvalidAnnotation)
+}
+
 func missingSemicolonError(state parserState, direction Direction, s string) error {
 	return fmt.Errorf("failed to parse migration: state %d, direction: %v: unexpected unfinished SQL query: %q: missing semicolon?",
 		state,

internal/sqlparser/parser_test.go

@@ -507,3 +507,82 @@ CREATE TABLE post (
 	check.HasError(t, err)
 	check.Contains(t, err.Error(), "variable substitution failed: $SOME_UNSET_VAR: required env var not set:")
 }
+
+func Test_extractAnnotation(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   string
+		want    annotation
+		wantErr func(t *testing.T, err error)
+	}{
+		{
+			name:    "Up",
+			input:   "-- +goose Up",
+			want:    annotationUp,
+			wantErr: check.NoError,
+		},
+		{
+			name:    "Down",
+			input:   "-- +goose Down",
+			want:    annotationDown,
+			wantErr: check.NoError,
+		},
+		{
+			name:    "StmtBegin",
+			input:   "-- +goose StatementBegin",
+			want:    annotationStatementBegin,
+			wantErr: check.NoError,
+		},
+		{
+			name:    "NoTransact",
+			input:   "-- +goose NO TRANSACTION",
+			want:    annotationNoTransaction,
+			wantErr: check.NoError,
+		},
+		{
+			name:    "Unsupported",
+			input:   "-- +goose unsupported",
+			want:    "",
+			wantErr: check.HasError,
+		},
+		{
+			name:    "Empty",
+			input:   "-- +goose",
+			want:    "",
+			wantErr: check.HasError,
+		},
+		{
+			name:    "statement with spaces and Uppercase",
+			input:   "-- +goose   UP 	",
+			want:    annotationUp,
+			wantErr: check.NoError,
+		},
+		{
+			name:    "statement with leading whitespace - error",
+			input:   " -- +goose   UP 	",
+			want:    "",
+			wantErr: check.HasError,
+		},
+		{
+			name:    "statement with leading \t - error",
+			input:   "\t-- +goose   UP 	",
+			want:    "",
+			wantErr: check.HasError,
+		},
+		{
+			name:    "multiple +goose annotations - error",
+			input:   "-- +goose +goose Up",
+			want:    "",
+			wantErr: check.HasError,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := extractAnnotation(tt.input)
+			tt.wantErr(t, err)
+
+			check.Equal(t, got, tt.want)
+		})
+	}
+}

internal/sqlparser/testdata/valid-up/test01/input.sql

@@ -1,12 +1,12 @@
--- +goose Up
+-- +goose UP
 CREATE TABLE emp (
     empname text,
     salary integer,
     last_date timestamp,
     last_user text
 );
 
--- +goose StatementBegin
+-- +goose statementBegin
 CREATE FUNCTION emp_stamp() RETURNS trigger AS $emp_stamp$
     BEGIN
         -- Check that empname and salary are given