streamline table api (#101)

pkg/printer/cast.go

@@ -1,3 +1,5 @@
+package printer
+
 /*
 Copyright © 2026 Thomas von Dein
 
@@ -14,7 +16,6 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
-package printer
 
 import (
 	"fmt"
@@ -25,9 +26,11 @@ import (
 	"github.com/elastic/go-elasticsearch/v9/typedapi/types"
 )
 
-func any2string(in any) string {
+// stringer returns  the string  representation of different  types of
+// values
+func stringer(cell any) string {
 	//nolint:gocritic
-	switch val := in.(type) {
+	switch val := cell.(type) {
 	case string:
 		return val
 	case bool:
@@ -54,52 +57,27 @@ func any2string(in any) string {
 		return string(val)
 	case nil:
 		return "null"
-	case types.Percentage, types.DateTime:
-		return val.(string)
-	}
+	case *types.Float64:
+		// ignore err here, because types.Float64.MarshalJSON() never returns one
+		f, _ := val.MarshalJSON()
 
-	return ""
+		return string(f)
+	default:
+		// Caution: this may cause a  panic if the [unknown] type does
+		// not implement  fmt.Stringer. In this case  add another case
+		// to the type switch for it above.
+		return cell.(fmt.Stringer).String()
+	}
 }
 
-func (data *Table) preprocessRows() {
-	if data.processed {
-		// only do it once
-		return
+// visibleLen returns the  length of a string but  only visible chars,
+// w/o ansi color escapes
+func visibleLen(word string) int {
+	if !strings.Contains(word, "\x1b") {
+		// no ansi escape in there, use faster method
+		return len(word)
 	}
 
-	// convert entries to strings
-	data.rows = make([][]string, len(data.Entries))
-	for rowidx, entries := range data.Entries {
-		data.rows[rowidx] = make([]string, len(entries))
-
-		for colidx, entry := range data.Entries[rowidx] {
-			data.rows[rowidx][colidx] = any2string(entry)
-		}
-	}
-
-	// determine header lenght's
-	for idx, head := range data.Headers {
-		data.lenHeaders[idx] = visibleLen(head)
-	}
-
-	// determine max width per column
-	for _, entries := range data.rows {
-		currentWidth := 0
-
-		for idx, entry := range entries {
-			length := visibleLen(entry)
-
-			if data.lenHeaders[idx] < length {
-				if length > currentWidth+data.maxwidth {
-					data.lenHeaders[idx] = data.maxwidth - currentWidth
-				} else {
-					data.lenHeaders[idx] = length
-				}
-			}
-
-			currentWidth += data.lenHeaders[idx]
-		}
-	}
-
-	data.processed = true
+	// contains escapes, need to clean up before counting
+	return len(ansiCtrlSeq.ReplaceAllLiteralString(word, ""))
 }