feat(format): Doc-IR core, line_width (120) and where_wrap when_long

pkg/config/config.go

@@ -69,6 +69,7 @@ type Style struct {
 	IndentJoin        bool     // extra indentation for JOIN … ON lines
 	JoinIndentSize    int      // extra indent levels for JOINs (default 1)
 	WhereWrap         WrapMode // always|when_long|never — each AND/OR on its own line
+	LineWidth         int      // target width for when_long wrapping (0 = unlimited)
 	WhereAndOrIndent  bool     // AND/OR indented one level under WHERE
 
 	// --- Subqueries ---
@@ -120,6 +121,7 @@ func Default() Style {
 		SetAlignEqual:     false,
 		IndentJoin:        false,
 		JoinIndentSize:    1,
+		LineWidth:         120,
 		WhereWrap:         WrapAlways,
 		WhereAndOrIndent:  true,
 
@@ -169,6 +171,7 @@ type yamlFile struct {
 	IndentJoin        *bool   `yaml:"indent_join"`
 	JoinIndentSize    *int    `yaml:"join_indent_size"`
 	WhereWrap         *string `yaml:"where_wrap"`
+	LineWidth         *int    `yaml:"line_width"`
 	WhereAndOrIndent  *bool   `yaml:"where_and_or_indent"`
 
 	SubqueryOpening          *string `yaml:"subquery_opening"`
@@ -258,6 +261,12 @@ func Load(startDir string) (Style, error) {
 	if yf.JoinIndentSize != nil {
 		st.JoinIndentSize = *yf.JoinIndentSize
 	}
+	if yf.LineWidth != nil {
+		if *yf.LineWidth < 0 {
+			return st, fmt.Errorf("pgtidy: %s: line_width: must be >= 0", path)
+		}
+		st.LineWidth = *yf.LineWidth
+	}
 	if yf.WhereWrap != nil {
 		wm := WrapMode(*yf.WhereWrap)
 		if err := validWrap(wm); err != nil {