add type caster to table, convert cells automatically, users use any

pkg/printer/bytes.go

@@ -0,0 +1,31 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+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 "github.com/dustin/go-humanize"
+
+type ByteSize struct {
+	size uint64
+}
+
+func Bytes(size int64) ByteSize {
+	return ByteSize{size: uint64(size)}
+}
+
+func (b *ByteSize) String() string {
+	return humanize.Bytes(b.size)
+}

pkg/printer/cast.go

@@ -0,0 +1,99 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+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"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/elastic/go-elasticsearch/v9/typedapi/types"
+)
+
+func any2string(in any) string {
+	switch val := in.(type) {
+	case string:
+		return val
+	case bool:
+		return strconv.FormatBool(val)
+	case int64:
+		return strconv.FormatInt(val, 10)
+	case int:
+		return strconv.Itoa(val)
+	case float64:
+		return fmt.Sprintf("%.2f", val)
+	case []string:
+		return strings.Join(val, ",")
+	case ByteSize:
+		return val.String()
+	case time.Time:
+		return val.Format("2006-01-02 15:04:05")
+	case []byte:
+		return string(val)
+	case types.Percentage:
+		return val.(string)
+	case types.DateTime:
+		return val.(string)
+	case nil:
+		return "null"
+	}
+
+	return ""
+}
+
+func (data *Table) preprocessRows() {
+	if data.processed {
+		// only do it once
+		return
+	}
+
+	// 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
+}

pkg/printer/table.go

@@ -32,8 +32,10 @@ import (
 type Table struct {
 	Mode    string // tsv, json, yaml
 	Headers []string
-	Entries [][]string
+	Entries [][]any
 
+	rows       [][]string // representation used for printing
+	processed  bool
 	lenHeaders []int
 	alignInts  bool
 	maxwidth   int
@@ -43,7 +45,7 @@ func NewTable(conf *cfg.Config, columns, rows int) *Table {
 	table := Table{Mode: conf.Output, maxwidth: cfg.GetTermWidth()}
 
 	table.Headers = make([]string, columns)
-	table.Entries = make([][]string, rows)
+	table.Entries = make([][]any, rows)
 	table.lenHeaders = make([]int, columns)
 	table.alignInts = conf.AlignInts
 
@@ -59,7 +61,7 @@ func NewTableEmpty(conf *cfg.Config) *Table {
 func (table *Table) WithHeaders(headers ...string) *Table {
 	count := len(headers)
 
-	table.Entries = [][]string{}
+	table.Entries = [][]any{}
 	table.lenHeaders = make([]int, count)
 	table.Headers = make([]string, count)
 
@@ -84,11 +86,11 @@ var (
 )
 
 // needed for json and yaml output
-func (data *Table) toMap() []map[string]string {
-	raw := make([]map[string]string, len(data.Entries))
+func (data *Table) toMap() []map[string]any {
+	raw := make([]map[string]any, len(data.Entries))
 
 	for idx, entries := range data.Entries {
-		raw[idx] = make(map[string]string, len(data.Headers))
+		raw[idx] = make(map[string]any, len(data.Headers))
 		for eidx, entry := range entries {
 			raw[idx][data.Headers[eidx]] = entry
 		}
@@ -124,27 +126,8 @@ func (data *Table) PrintJSON() error {
 }
 
 func (data *Table) PrintTSV() error {
-	// determine lenght's
-	for idx, head := range data.Headers {
-		data.lenHeaders[idx] = visibleLen(head)
-	}
-
-	for _, entries := range data.Entries {
-		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]
-		}
-	}
+	// length's, convert cell types
+	data.preprocessRows()
 
 	// output headers
 	for idx, header := range data.Headers {
@@ -161,7 +144,7 @@ func (data *Table) PrintTSV() error {
 	}
 	fmt.Println()
 
-	for _, entries := range data.Entries {
+	for _, entries := range data.rows {
 		currentWidth := 0
 
 		for idx, entry := range entries {
@@ -211,8 +194,10 @@ func (data *Table) Sort() {
 		return
 	}
 
-	sort.Slice(data.Entries, func(i, j int) bool {
-		return data.Entries[i][0] < data.Entries[j][0]
+	data.preprocessRows()
+
+	sort.Slice(data.rows, func(i, j int) bool {
+		return data.rows[i][0] < data.rows[j][0]
 	})
 }
 
@@ -227,7 +212,7 @@ func (data *Table) Addheaders(headers ...string) {
 	}
 }
 
-func (data *Table) AddRow(fields ...string) {
+func (data *Table) AddRow(fields ...any) {
 	data.Entries = append(data.Entries, fields)
 }