add index copy (aka reindex), fix typoe indicies to indices (#100)

Makefile

@@ -110,3 +110,12 @@ profile: buildlocal
 	./esctl api ls --profile-file cpu.profile
 	go tool pprof -text esctl cpu.profile
 	go tool pprof --http localhost:8888 ./esctl cpu.profile
+
+docker-up:
+	make -C t up
+
+docker-waitup:
+	make -C t up
+
+docker-down:
+	make -C t down

README.md

@@ -216,7 +216,7 @@ Pending Tasks              0
 Nodes                      3                                   
 Red Indices                0                                   
 Long Running Tasks         2                                   
-Indicies                   221                                 
+indices                   221                                 
 Docs                       9854777                             
 Total Size                 3.4 GB                              
 Total Queries              4210411                             
@@ -534,7 +534,7 @@ cluster                     - manage cluster[s]
     allocate-empty-primary  - allocate an empty primary shard to a node
     allocate-stale-primary  - allocate a stale primary shard to a node
 datastream                  - manage data streams
-  list                      - list indicies
+  list                      - list indices
   show                      - show details about an data stream
   create                    - create a new data stream
   delete                    - delete a data stream
@@ -554,8 +554,8 @@ ilm                         - manage index lifecycle
     list                    - list index rollover config
     show                    - show rollover forecast over all indices
   explain                   - explain ilm condition of an index
-index                       - manage indicies
+index                       - manage indices
-  list                      - list indicies
+  list                      - list indices
   show                      - show details about an index
   create                    - create a new index
   update                    - update an index
@@ -564,6 +564,7 @@ index                       - manage indicies
   fields                    - show info about field capabilities
   ilm                       - show ilm status
   du                        - show index disk usage
+  copy                      - copy (reindex) documents from one index to another
   alias                     - manage index aliases
     create                  - create an index alias
     list                    - list index aliases
@@ -587,6 +588,7 @@ role                        - manage roles
   show                      - show details about a role
   diff                      - show differences between roles and CSV baseline
 search                      - search within an index
+searchql                    - search using ES/QL language
 shard                       - manage shards
   list                      - list shards
   show                      - show details about a shard

TODO.md

@@ -6,4 +6,3 @@
 - add datastream support:
   https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-data-stream
   
-  also exclude data stream backing indices from index ls

cmd/ccr.go

@@ -52,7 +52,7 @@ func CcrStatus(conf *cfg.Config) *cli.Command {
 		Flags: []cli.Flag{
 			&cli.StringFlag{
 				Name:        "exclude",
-				Usage:       "regexp of indicies to exclude",
+				Usage:       "regexp of indices to exclude",
 				Destination: &conf.Exclude,
 				Aliases:     []string{"e"},
 			},

cmd/completion.go

@@ -34,6 +34,7 @@ const (
 	Cilm
 	Cnode
 	Cclustersettings
+	Cindextemplate
 )
 
 func complete(conf *cfg.Config, cmd *cli.Command, what int) {
@@ -65,6 +66,8 @@ func complete(conf *cfg.Config, cmd *cli.Command, what int) {
 		list, err = es.NodeNames(conf)
 	case Cclustersettings:
 		list, err = es.ClusterSettingsNames(conf)
+	case Cindextemplate:
+		list, err = es.IndexTemplateNames(conf)
 	}
 
 	if err != nil {

cmd/datastream.go

@@ -46,7 +46,7 @@ func DatastreamList(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:    "list",
 		Aliases: []string{"ls"},
-		Usage:   "list indicies",
+		Usage:   "list indices",
 
 		Flags: []cli.Flag{
 			&cli.IntFlag{
@@ -169,7 +169,7 @@ func DatastreamRollover(conf *cfg.Config) *cli.Command {
 				Usage:       "roll over after max age (eg: 7d, 2m, 8h)",
 				Destination: &conf.MaxAge,
 			},
-			&cli.IntFlag{
+			&cli.Int64Flag{
 				Name:        "max-docs",
 				Usage:       "roll over after max docs",
 				Destination: &conf.MaxDocs,

cmd/ilm_forecast.go

@@ -89,7 +89,7 @@ func IlmForecastList(conf *cfg.Config) *cli.Command {
 			},
 			&cli.BoolFlag{
 				Name:        "hidden",
-				Usage:       "include hidden indicies",
+				Usage:       "include hidden indices",
 				Destination: &conf.Hidden,
 				Aliases:     []string{"H"},
 			},

cmd/index.go

@@ -30,7 +30,7 @@ func Index(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:    "index",
 		Aliases: []string{"i"},
-		Usage:   "manage indicies",
+		Usage:   "manage indices",
 
 		Commands: []*cli.Command{
 			IndexList(conf),
@@ -42,6 +42,7 @@ func Index(conf *cfg.Config) *cli.Command {
 			IndexFields(conf),
 			IndexIlm(conf),
 			IndexDu(conf),
+			IndexCopy(conf),
 
 			// sub commands
 			IndexAlias(conf),
@@ -54,7 +55,7 @@ func IndexList(conf *cfg.Config) *cli.Command {
 	return &cli.Command{
 		Name:    "list",
 		Aliases: []string{"ls"},
-		Usage:   "list indicies",
+		Usage:   "list indices",
 
 		Flags: []cli.Flag{
 			&cli.IntFlag{
@@ -65,25 +66,25 @@ func IndexList(conf *cfg.Config) *cli.Command {
 			},
 			&cli.BoolFlag{
 				Name:        "partials",
-				Usage:       "include partial indicies",
+				Usage:       "include partial indices",
 				Destination: &conf.Partials,
 				Aliases:     []string{"p"},
 			},
 			&cli.BoolFlag{
 				Name:        "hidden",
-				Usage:       "include hidden indicies",
+				Usage:       "include hidden indices",
 				Destination: &conf.Hidden,
 				Aliases:     []string{"H"},
 			},
 			&cli.BoolFlag{
 				Name:        "failed",
-				Usage:       "include only red failed indicies",
+				Usage:       "include only red failed indices",
 				Destination: &conf.Failed,
 				Aliases:     []string{"f"},
 			},
 			&cli.StringSliceFlag{
 				Name:        "filter",
-				Usage:       "show only indicies matching the filter",
+				Usage:       "show only indices matching the filter",
 				Destination: &conf.Filter,
 				Aliases:     []string{"F"},
 			},
@@ -299,3 +300,82 @@ func IndexDu(conf *cfg.Config) *cli.Command {
 		},
 	}
 }
+
+func IndexCopy(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:      "copy",
+		Aliases:   []string{"alias", "cp"},
+		Usage:     "copy (reindex) documents from one index to another",
+		UsageText: "index copy [options] -s <source-index> -t <dest-index>",
+
+		Flags: []cli.Flag{
+			// FIXME: not implemented by typed API
+			// &cli.BoolFlag{
+			// 	Name:        "missing", // op_type
+			// 	Usage:       "copy only missing docs",
+			// 	Destination: &conf.Missing,
+			// 	Aliases:     []string{"m"},
+			// },
+			// &cli.BoolFlag{
+			// 	Name:        "sync", // version_type to external
+			// 	Usage:       "create missing docs and update outdated docs",
+			// 	Destination: &conf.Sync,
+			// 	Aliases:     []string{"S"},
+			// },
+			&cli.BoolFlag{
+				Name:        "force", // conflicts to proceed
+				Usage:       "continue reindexing even when conflicts happen",
+				Destination: &conf.Force,
+				Aliases:     []string{"f"},
+			},
+			&cli.Float64Flag{
+				Name:        "requests-per-second",
+				Usage:       "the maximum number of documents to index per second (-1 turns off throttling)",
+				Destination: &conf.RequestsPerSecond,
+				Aliases:     []string{"R"},
+			},
+			&cli.Int64Flag{
+				Name:        "max-docs",
+				Usage:       "the maximum number of documents to reindex",
+				Destination: &conf.MaxDocs,
+				Aliases:     []string{"m"},
+			},
+			&cli.DurationFlag{
+				Name:        "timeout",
+				Usage:       "timeout for write operations (e.g. 300m or 120s)",
+				Destination: &conf.Timeout,
+				Aliases:     []string{"T"},
+			},
+			&cli.BoolFlag{
+				Name:        "refresh",
+				Usage:       "refresh affected shards to make this operation visible to search",
+				Destination: &conf.Refresh,
+				Aliases:     []string{"r"},
+			},
+			&cli.BoolFlag{
+				Name:        "wait",
+				Usage:       "wait for active shards",
+				Destination: &conf.Wait,
+				Aliases:     []string{"w"},
+			},
+			&cli.StringSliceFlag{
+				Name:        "source",
+				Usage:       "source index (multiple supported)",
+				Destination: &conf.SourceIndices,
+				Aliases:     []string{"s"},
+				Required:    true,
+			},
+			&cli.StringFlag{
+				Name:        "target",
+				Usage:       "target index",
+				Destination: &conf.Index,
+				Aliases:     []string{"t"},
+				Required:    true,
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			return es.IndexCopy(conf)
+		},
+	}
+}

cmd/index_alias.go

@@ -121,7 +121,7 @@ func IndexAliasRollover(conf *cfg.Config) *cli.Command {
 				Usage:       "roll over after max age (eg: 7d, 2m, 8h)",
 				Destination: &conf.MaxAge,
 			},
-			&cli.IntFlag{
+			&cli.Int64Flag{
 				Name:        "max-docs",
 				Usage:       "roll over after max docs",
 				Destination: &conf.MaxDocs,
@@ -159,7 +159,7 @@ func IndexAliasList(conf *cfg.Config) *cli.Command {
 		Flags: []cli.Flag{
 			&cli.StringSliceFlag{
 				Name:        "filter",
-				Usage:       "show only aliases for indicies matching the filter",
+				Usage:       "show only aliases for indices matching the filter",
 				Destination: &conf.Filter,
 				Aliases:     []string{"F"},
 			},

cmd/index_template.go

@@ -49,8 +49,23 @@ func IndexTemplateList(conf *cfg.Config) *cli.Command {
 		Aliases: []string{"ls"},
 		Usage:   "list index templates",
 
+		Flags: []cli.Flag{
+			&cli.StringSliceFlag{
+				Name:        "filter-index-pattern",
+				Usage:       "show only index templates which use patterns, which match the filter",
+				Destination: &conf.Filter,
+				Aliases:     []string{"F"},
+			},
+			&cli.BoolFlag{
+				Name:        "hidden",
+				Usage:       "show hidden index templates as well",
+				Destination: &conf.Hidden,
+				Aliases:     []string{"H"},
+			},
+		},
+
 		Action: func(ctx context.Context, cmd *cli.Command) error {
-			return es.IndexTemplateList(conf)
+			return es.IndexTemplateList(conf, cmd.Args().Get(0))
 		},
 	}
 }
@@ -71,7 +86,7 @@ func IndexTemplateShow(conf *cfg.Config) *cli.Command {
 		},
 
 		ShellComplete: func(ctx context.Context, cmd *cli.Command) {
-			complete(conf, cmd, Cindex)
+			complete(conf, cmd, Cindextemplate)
 		},
 	}
 }
@@ -215,7 +230,7 @@ func IndexTemplateDelete(conf *cfg.Config) *cli.Command {
 		},
 
 		ShellComplete: func(ctx context.Context, cmd *cli.Command) {
-			complete(conf, cmd, Cindex)
+			complete(conf, cmd, Cindextemplate)
 		},
 	}
 }

cmd/root.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	golog "log"
 	"os"
+	"runtime/debug"
 	"runtime/pprof"
 	"strings"
 
@@ -118,6 +119,12 @@ func Main() int {
 				Usage:       "enable HTTP debugging",
 				Destination: &conf.DebugHTTP,
 			},
+			&cli.BoolFlag{
+				Name:        "debug-goroutines",
+				Value:       false,
+				Usage:       "enable goroutine debugging",
+				Destination: &conf.DebugGoRoutines,
+			},
 			&cli.BoolFlag{
 				Name:        "align-ints",
 				Aliases:     []string{"I"},
@@ -253,6 +260,12 @@ func Version(conf *cfg.Config) *cli.Command {
 		Usage: "show esctl version information",
 
 		Action: func(ctx context.Context, cmd *cli.Command) error {
+			info, _ := debug.ReadBuildInfo()
+
+			if strings.Contains(info.Main.Version, "+dirty") {
+				cfg.COMMIT += "+dirty"
+			}
+
 			_, err := fmt.Printf(versionFmt,
 				cfg.Version, cfg.BUILD, cfg.BRANCH, cfg.COMMIT, cfg.GOVERSION, cfg.APIVERSION)
 

go.mod

@@ -18,7 +18,7 @@ go 1.26
 
 require (
 	github.com/MichaelMure/go-term-markdown v0.1.4
-	github.com/alecthomas/repr v0.5.2
+	github.com/alecthomas/repr v0.5.3
 	github.com/charmbracelet/bubbles v1.0.0
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
@@ -40,6 +40,7 @@ require (
 )
 
 require (
+	codeberg.org/scip/mapmap v0.0.2 // indirect
 	github.com/MichaelMure/go-term-text v0.3.1 // indirect
 	github.com/alecthomas/chroma v0.7.1 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect

go.sum

@@ -1,3 +1,7 @@
+codeberg.org/scip/mapmap v0.0.1 h1:L1jMBo/UNp19MXUF/ONjc1XKVGeuF1x05z0pEhjgkzA=
+codeberg.org/scip/mapmap v0.0.1/go.mod h1:/ojYo2P7dMA2FWEu+jHKmsKPeq5yDcCvXeHevqZd5OI=
+codeberg.org/scip/mapmap v0.0.2 h1:0i61jOUwFmGVwPukrMzrx0Fi4T9Qru2nlmibuaJimBo=
+codeberg.org/scip/mapmap v0.0.2/go.mod h1:/ojYo2P7dMA2FWEu+jHKmsKPeq5yDcCvXeHevqZd5OI=
 github.com/MichaelMure/go-term-markdown v0.1.4 h1:Ir3kBXDUtOX7dEv0EaQV8CNPpH+T7AfTh0eniMOtNcs=
 github.com/MichaelMure/go-term-markdown v0.1.4/go.mod h1:EhcA3+pKYnlUsxYKBJ5Sn1cTQmmBMjeNlpV8nRb+JxA=
 github.com/MichaelMure/go-term-text v0.3.1 h1:Kw9kZanyZWiCHOYu9v/8pWEgDQ6UVN9/ix2Vd2zzWf0=
@@ -10,8 +14,8 @@ github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721 h1:JHZL0hZKJ1VEN
 github.com/alecthomas/colour v0.0.0-20160524082231-60882d9e2721/go.mod h1:QO9JBoKquHd+jz9nshCh40fOfO+JzsoXy8qTHF68zU0=
 github.com/alecthomas/kong v0.2.1-0.20190708041108-0548c6b1afae/go.mod h1:+inYUSluD+p4L8KdviBSgzcqEjUQOfC5fQDRFuc36lI=
 github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
-github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
+github.com/alecthomas/repr v0.5.3 h1:Ebk3yZ0kvrHC7TkTHLDJGDq1LxKeu9sQBQREFMcesS8=
-github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
+github.com/alecthomas/repr v0.5.3/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/charmbracelet/bubbles v1.0.0 h1:12J8/ak/uCZEMQ6KU7pcfwceyjLlWsDLAxB5fXonfvc=

pkg/cfg/cluster.go

@@ -194,18 +194,18 @@ func (cluster *Cluster) getDefaultOptions() []elasticsearch.Option {
 }
 
 func (cluster *Cluster) getTransport() elastictransport.Option {
-	transport := &http.Transport{
+	transport := new(http.Transport{
 		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-	}
+	})
 
 	if cluster.DebugHTTP {
 		return elastictransport.WithTransport(
-			&DebugTransport{Transport: transport},
+			new(DebugTransport{Transport: transport}),
 		)
 	}
 
 	return elastictransport.WithTransport(
-		&CompatibilityTransport{Transport: transport},
+		new(CompatibilityTransport{Transport: transport}),
 	)
 }
 

pkg/cfg/config.go

@@ -22,13 +22,14 @@ import (
 	"os"
 	"path/filepath"
 	"reflect"
+	"time"
 
 	"github.com/alecthomas/repr"
 	"gopkg.in/yaml.v3"
 )
 
 const (
-	Version string = `v0.0.26`
+	Version string = `v0.0.27`
 )
 
 var (
@@ -68,6 +69,13 @@ type Config struct {
 	Retention  string   // index template create: -r
 	Rollover   bool     // index template create: -R
 
+	Missing           bool          // index copy: -m
+	Sync              bool          // index copy: -S
+	RequestsPerSecond float64       // index copy: -R
+	Timeout           time.Duration // index copy: -T
+	Refresh           bool          // index copy: -r
+	SourceIndices     []string      // index copy: -s
+
 	From, To, MaxItems int      // search: flags
 	Filter             []string // search: -F
 	Path               string   // search+doc sh: -p
@@ -89,17 +97,19 @@ type Config struct {
 
 	Force bool // ccr follower renew: -f
 
-	DebugHTTP   bool   // root: --debug-http
+	DebugHTTP       bool   // root: --debug-http
-	Separator   string // role diff: -s
+	DebugGoRoutines bool   // root: --debug-goroutines
-	NotDeployed bool   // role diff: -n
+	Separator       string // role diff: -s
-	Undefined   bool   // role diff: -u
+	NotDeployed     bool   // role diff: -n
-	Diff        bool   // role diff: -D
+	Undefined       bool   // role diff: -u
-	Hidden      bool   // ds ls: -H
+	Diff            bool   // role diff: -D
+	Hidden          bool   // ds ls: -H
 
 	// rollover
-	MaxAge                              string
+	MaxAge                     string
-	MaxDocs, MaxShardSize, MaxShardDocs int  // roll over
+	MaxDocs                    int64 // roll over, plus others
-	DryRun                              bool // rollover: -n
+	MaxShardSize, MaxShardDocs int   // roll over
+	DryRun                     bool  // rollover: -n
 
 	Tag      string // api ls: -t
 	HumanCat bool   // api repl: -H
@@ -113,7 +123,7 @@ type Config struct {
 }
 
 func NewConfig() *Config {
-	return &Config{Clusters: map[string]*Cluster{}}
+	return new(Config{Clusters: map[string]*Cluster{}})
 }
 
 func getDefaultPath() string {
@@ -216,7 +226,7 @@ func (conf *Config) LoadConfig() error {
 		return fmt.Errorf("failed to read config file: %w", err)
 	}
 
-	newconf := &Config{}
+	newconf := new(Config{})
 
 	err = yaml.Unmarshal(data, newconf)
 	if err != nil {

pkg/es/api.go

@@ -28,6 +28,7 @@ import (
 	"io"
 	"log"
 	"log/slog"
+	"maps"
 	"net/http"
 	"os"
 	"os/exec"
@@ -158,7 +159,7 @@ func ApiRepl(conf *cfg.Config) error {
 }
 
 func pageJsonOutput(conf *cfg.Config, raw []byte) {
-	tmpconf := &cfg.Config{HaveJQ: conf.HaveJQ}
+	tmpconf := new(cfg.Config{HaveJQ: conf.HaveJQ})
 
 	if conf.Pager != "" {
 		tmpconf.HaveJQ = false
@@ -206,16 +207,16 @@ func CallAPI(conf *cfg.Config, verb, path, data string) ([]byte, error) {
 	verb = strings.ToUpper(verb)
 
 	// we're using port-forwards anyway
-	noVerifyTransport := &http.Transport{
+	noVerifyTransport := new(http.Transport{
-		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		TLSClientConfig: new(tls.Config{InsecureSkipVerify: true}),
-	}
+	})
 
-	client := &http.Client{Transport: noVerifyTransport}
+	client := new(http.Client{Transport: noVerifyTransport})
 
 	if conf.DebugHTTP {
-		client = &http.Client{
+		client = new(http.Client{
-			Transport: &cfg.DebugTransport{
+			Transport: new(cfg.DebugTransport{
-				Transport: noVerifyTransport}}
+				Transport: noVerifyTransport})})
 	}
 
 	req, err := http.NewRequest(verb, conf.DefaultCluster.Uri+path, bytes.NewBuffer([]byte(data)))
@@ -366,16 +367,7 @@ func ApiList(conf *cfg.Config, pattern string) error {
 func ApiPathNames() []string {
 	assets.LoadAssetOpenApi()
 
-	paths := make([]string, len(assets.OpenAPI.Spec().Paths.Paths))
+	return slices.Collect(maps.Keys(assets.OpenAPI.Spec().Paths.Paths))
-
-	idx := 0
-
-	for path := range assets.OpenAPI.Spec().Paths.Paths {
-		paths[idx] = path
-		idx++
-	}
-
-	return paths
 }
 
 func ApiShow(conf *cfg.Config, showpath, verb string) error {
@@ -536,7 +528,7 @@ func getApiExample(op *Op) string {
 // otherwise showpath+verb have to match precisely.
 func matchOperation(showpath, verb string) (*Op, error) {
 	ops := []*Op{}
-	op := &Op{}
+	op := new(Op{})
 
 	var found bool
 

pkg/es/ccr.go

@@ -57,7 +57,7 @@ func CcrStatus(conf *cfg.Config, leader, follower string) error {
 		res, err := conf.Clusters[alias].ES().Cat.Indices().
 			Do(context.Background())
 		if err != nil {
-			return fmt.Errorf("failed to get indicies on %s: %w", alias, esErrorString(err))
+			return fmt.Errorf("failed to get indices on %s: %w", alias, esErrorString(err))
 		}
 
 		indices[alias] = make(map[string]*types.IndicesRecord, len(res))

pkg/es/cluser_health_report.go

@@ -17,6 +17,10 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package es
 
 import (
+
+	// "encoding/json/jsontext"
+	// "encoding/json/v2"
+
 	"encoding/json"
 	"fmt"
 
@@ -49,11 +53,22 @@ func getHealthReport(conf *cfg.Config) (*HealthReport, error) {
 		return nil, err
 	}
 
-	report := HealthReport{}
+	report := new(HealthReport{})
+
+	// FIXME: use this once jsonv2  is no more experimental it already
+	//  builds  and works  like  intended,  but golangci-lint  doesn't
+	// recognize it with: go: unknown GOEXPERIMENT jsonv2
+	//
+	// if err := json.UnmarshalDecode(
+	// 	jsontext.NewDecoder(
+	// 		bytes.NewBuffer(raw)),
+	// 	&report); err != nil {
+	// 	return nil, fmt.Errorf("failed to unmarshal healthreport response: %w", err)
+	// }
 
 	if err := json.Unmarshal(raw, &report); err != nil {
 		return nil, fmt.Errorf("failed to unmarshal healthreport response: %w", err)
 	}
 
-	return &report, nil
+	return report, nil
 }

pkg/es/cluster.go

@@ -101,23 +101,39 @@ func getClusterStatus(conf *cfg.Config) (*apiResponse, error) {
 	es := conf.DefaultCluster.ES()
 
 	responses := make(chan apiResponse, gocount)
-	wg := &sync.WaitGroup{}
+	wg := new(sync.WaitGroup{})
 
-	wg.Add(gocount)
+	wg.Go(func() {
-	go getApiData(conf, es, wg, responses, "health")
+		getApiData(conf, es, responses, "health")
-	go getApiData(conf, es, wg, responses, "healthreport")
+	})
-	go getApiData(conf, es, wg, responses, "info")
+
-	go getApiData(conf, es, wg, responses, "ccr")
+	wg.Go(func() {
-	go getApiData(conf, es, wg, responses, "indices")
+		getApiData(conf, es, responses, "healthreport")
-	go getApiData(conf, es, wg, responses, "tasks")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, es, responses, "info")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, es, responses, "ccr")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, es, responses, "indices")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, es, responses, "tasks")
+	})
 
 	if conf.Verbose {
-		go getApiData(conf, es, wg, responses, "stats")
+		getApiData(conf, es, responses, "stats")
 	}
 
 	wg.Wait()
 
-	all := apiResponse{}
+	all := new(apiResponse{})
 
 	var err error
 
@@ -144,7 +160,7 @@ func getClusterStatus(conf *cfg.Config) (*apiResponse, error) {
 		}
 	}
 
-	return &all, err
+	return all, err
 }
 
 func ClusterStatus(conf *cfg.Config) error {
@@ -272,7 +288,7 @@ func gatherClusterStats(clusterstats *clusterstats.Response, table *printer.Tabl
 	}
 
 	table.Entries = append(table.Entries, [][]any{
-		{"Indicies", clusterstats.Indices.Count},
+		{"indices", clusterstats.Indices.Count},
 		{"Docs", clusterstats.Indices.Docs.Count},
 		{"Total Size", printer.Bytes(clusterstats.Indices.Docs.TotalSizeInBytes)},
 		{"Total Queries", "%d", querycount},

pkg/es/cluster_reroute.go

@@ -29,12 +29,12 @@ func ClusterRerouteMove(conf *cfg.Config, index string) error {
 	move := conf.DefaultCluster.ES().Cluster.Reroute()
 
 	commands := esdsl.NewCommand()
-	moveCommand := &types.CommandMoveAction{
+	moveCommand := new(types.CommandMoveAction{
 		Shard:    conf.Shards,
 		FromNode: conf.FromNode,
 		ToNode:   conf.ToNode,
 		Index:    index,
-	}
+	})
 
 	commands.CommandCaster().Move = moveCommand
 
@@ -52,11 +52,11 @@ func ClusterRerouteAllocateReplica(conf *cfg.Config, index string) error {
 	move := conf.DefaultCluster.ES().Cluster.Reroute()
 
 	commands := esdsl.NewCommand()
-	allocCommand := &types.CommandAllocateReplicaAction{
+	allocCommand := new(types.CommandAllocateReplicaAction{
 		Shard: conf.Shards,
 		Node:  conf.ToNode,
 		Index: index,
-	}
+	})
 
 	commands.CommandCaster().AllocateReplica = allocCommand
 
@@ -74,12 +74,12 @@ func ClusterRerouteCancel(conf *cfg.Config, index string) error {
 	move := conf.DefaultCluster.ES().Cluster.Reroute()
 
 	commands := esdsl.NewCommand()
-	cancelCommand := &types.CommandCancelAction{
+	cancelCommand := new(types.CommandCancelAction{
 		Shard:        conf.Shards,
 		Node:         conf.ToNode,
 		Index:        index,
 		AllowPrimary: &conf.AllowPrimary,
-	}
+	})
 
 	commands.CommandCaster().Cancel = cancelCommand
 
@@ -97,12 +97,12 @@ func ClusterRerouteAllocatePrimary(conf *cfg.Config, index string, stale bool) e
 	move := conf.DefaultCluster.ES().Cluster.Reroute()
 
 	commands := esdsl.NewCommand()
-	allocCommand := &types.CommandAllocatePrimaryAction{
+	allocCommand := new(types.CommandAllocatePrimaryAction{
 		Shard:          conf.Shards,
 		Node:           conf.ToNode,
 		Index:          index,
 		AcceptDataLoss: conf.AcceptDataLoss,
-	}
+	})
 
 	if stale {
 		commands.CommandCaster().AllocateStalePrimary = allocCommand

pkg/es/cluster_util.go

@@ -89,7 +89,7 @@ func checkClusterStatus(conf *cfg.Config, leader, follower string) bool {
 			status[leader].ActivePrimaryShards,
 			status[follower].ActivePrimaryShards,
 		},
-		{"Indicies",
+		{"indices",
 			len(status[leader].Indices),
 			len(status[follower].Indices),
 		},
@@ -172,7 +172,7 @@ func findIlmErrors(conf *cfg.Config, leader, follower string) bool {
 	return false
 }
 
-// find unsynchronized indicies only present on leader
+// find unsynchronized indices only present on leader
 func findIndicesOnlyOnLeader(conf *cfg.Config, indices ClusterIndices, leader, follower string) bool {
 	exclude := regexp.MustCompile(DefaultExclude)
 	if conf.Exclude != "" {

pkg/es/doc.go

@@ -101,7 +101,7 @@ func DocDelete(conf *cfg.Config, queries []string) error {
 		return nil
 	}
 
-	req := &deletebyquery.Request{}
+	req := new(deletebyquery.Request{})
 
 	if len(queries) == 0 && conf.All {
 		req.Query = esdsl.NewMatchAllQuery().QueryCaster()

pkg/es/ilm.go

@@ -22,6 +22,8 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"maps"
+	"slices"
 	"strings"
 
 	"codeberg.org/scip/esctl/pkg/cfg"
@@ -62,13 +64,7 @@ func IlmNames(conf *cfg.Config) ([]string, error) {
 		return nil, fmt.Errorf("failed to get ilm policies: %w", esErrorString(err))
 	}
 
-	names := make([]string, len(res))
+	names := slices.Collect(maps.Keys(res))
-	idx := 0
-
-	for name := range res {
-		names[idx] = name
-		idx++
-	}
 
 	return names, nil
 }
@@ -351,7 +347,7 @@ func IlmCreate(conf *cfg.Config, policyname string) error {
 
 		var actions types.IlmActionsVariant = esdsl.NewIlmActions()
 
-		rollover := &types.RolloverAction{}
+		rollover := new(types.RolloverAction{})
 		haveroll := false
 
 		if policy != nil {
@@ -513,8 +509,8 @@ func IlmCreate(conf *cfg.Config, policyname string) error {
 		phases.PhasesCaster().Delete = policy.Phases.Delete
 	}
 
-	put := &putlifecycle.Request{}
+	put := new(putlifecycle.Request{})
-	newpolicy := &types.IlmPolicy{}
+	newpolicy := new(types.IlmPolicy{})
 	newpolicy.IlmPolicyCaster().Phases = *phases.PhasesCaster()
 	put.Policy = newpolicy
 

pkg/es/ilm_forecast.go

@@ -185,12 +185,19 @@ func virtualAge(phase *PhaseData) time.Duration {
 // Retrieve all index, ilm-explain and ilm-policies in parallel
 func getIlmPhaseData(conf *cfg.Config) ([]PhaseData, error) {
 	responses := make(chan apiResponse, 3)
-	wg := &sync.WaitGroup{}
+	wg := new(sync.WaitGroup{})
-	wg.Add(3)
 
-	go getApiData(conf, conf.DefaultCluster.ES(), wg, responses, "indicesbytes")
+	wg.Go(func() {
-	go getApiData(conf, conf.DefaultCluster.ES(), wg, responses, "explain")
+		getApiData(conf, conf.DefaultCluster.ES(), responses, "indicesbytes")
-	go getApiData(conf, conf.DefaultCluster.ES(), wg, responses, "policies")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, conf.DefaultCluster.ES(), responses, "explain")
+	})
+
+	wg.Go(func() {
+		getApiData(conf, conf.DefaultCluster.ES(), responses, "policies")
+	})
 
 	wg.Wait()
 
@@ -331,7 +338,7 @@ func findNextPhase(policy types.IlmPolicy, currentPhase string) *NextPhase {
 	// phase list to determine which comes next
 	phases, start := registerPhases(policy, currentPhase)
 
-	nextPhase := &NextPhase{}
+	nextPhase := new(NextPhase{})
 
 	// finally determine which phase comes next
 	// exception: hot, where we look for rollover rules

pkg/es/index.go

@@ -30,9 +30,11 @@ import (
 
 	"codeberg.org/scip/esctl/pkg/cfg"
 	"codeberg.org/scip/esctl/pkg/printer"
+	"codeberg.org/scip/mapmap"
 	"github.com/charmbracelet/lipgloss"
 	"github.com/elastic/go-elasticsearch/v9/typedapi/cat/indices"
 	"github.com/elastic/go-elasticsearch/v9/typedapi/esdsl"
+	"github.com/elastic/go-elasticsearch/v9/typedapi/types"
 	"github.com/elastic/go-elasticsearch/v9/typedapi/types/enums/healthstatus"
 )
 
@@ -41,7 +43,7 @@ func IndexNames(conf *cfg.Config) ([]string, error) {
 	res, err := conf.DefaultCluster.ES().Cat.Indices().
 		Do(context.Background())
 	if err != nil {
-		return nil, fmt.Errorf("failed to get indicies: %w", esErrorString(err))
+		return nil, fmt.Errorf("failed to get indices: %w", esErrorString(err))
 	}
 
 	indices := make([]string, len(res))
@@ -53,41 +55,29 @@ func IndexNames(conf *cfg.Config) ([]string, error) {
 }
 
 func filterIndices(conf *cfg.Config, list indices.Response) indices.Response {
-	// apply partials filter first
+	var filter *regexp.Regexp
-	selectedlist := indices.Response{}
 
-	for _, index := range list {
+	if len(conf.Filter) > 0 {
+		filter = regexp.MustCompile(conf.Filter[0])
+	}
+
+	return mapmap.NewSlicer(list).MapSliceValuesImmutable(func(index types.IndicesRecord) bool {
 		if !conf.Partials && strings.HasPrefix(*index.Index, "partial-") {
-			continue
+			return false
 		}
 
 		if !conf.Hidden && strings.HasPrefix(*index.Index, ".") {
-			continue
+			return false
 		}
 
-		if strings.HasPrefix(*index.Index, ".ds-") {
+		if len(conf.Filter) > 0 {
-			// ignore data stream backing indicies
+			if !filter.MatchString(*index.Index) {
-			continue
+				return false
+			}
 		}
 
-		selectedlist = append(selectedlist, index)
+		return true
-	}
+	})
-
-	if len(conf.Filter) == 0 {
-		return selectedlist
-	}
-
-	// we support just one filter here, for now
-	filter := *regexp.MustCompile(conf.Filter[0])
-	newlist := indices.Response{}
-
-	for _, index := range selectedlist {
-		if filter.MatchString(*index.Index) {
-			newlist = append(newlist, index)
-		}
-	}
-
-	return newlist
 }
 
 func IndexList(conf *cfg.Config) error {
@@ -99,10 +89,10 @@ func IndexList(conf *cfg.Config) error {
 
 	res, err := cat.Do(context.Background())
 	if err != nil {
-		return fmt.Errorf("failed to get indicies: %w", esErrorString(err))
+		return fmt.Errorf("failed to get indices: %w", esErrorString(err))
 	}
 
-	slog.Debug("ES result", "indicies", res)
+	slog.Debug("ES result", "indices", res)
 
 	list := filterIndices(conf, res)
 

pkg/es/index_copy.go

@@ -0,0 +1,83 @@
+/*
+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 es
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/printer"
+	"github.com/elastic/go-elasticsearch/v9/typedapi/esdsl"
+	"github.com/elastic/go-elasticsearch/v9/typedapi/types/enums/conflicts"
+)
+
+func IndexCopy(conf *cfg.Config) error {
+	copy := conf.DefaultCluster.ES().Reindex()
+
+	if conf.Force {
+		copy.Conflicts(conflicts.Proceed)
+	}
+
+	if conf.RequestsPerSecond != 0 {
+		copy.RequestsPerSecond(fmt.Sprintf("%.2f", conf.RequestsPerSecond))
+	}
+
+	if conf.MaxDocs > 0 {
+		copy.MaxDocs(conf.MaxDocs)
+	}
+
+	if conf.Timeout > 0 {
+		copy.Timeout(formatDuration(conf.Timeout))
+	}
+
+	if conf.Wait {
+		copy.WaitForActiveShards("all")
+	}
+
+	if conf.Refresh {
+		copy.Refresh(true)
+	}
+
+	copy.Source(esdsl.NewReindexSource().Index(conf.SourceIndices...))
+	copy.Dest(esdsl.NewReindexDestination().Index(conf.Index))
+
+	res, err := copy.Do(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to copy indices: %w", esErrorString(err))
+	}
+
+	table := printer.NewTable(conf, 2, 0).
+		WithHeaders("Reindex metrtic", "value")
+
+	table.Entries = [][]any{
+		{"Source indices", conf.SourceIndices},
+		{"Target index", conf.Index},
+		{"Batches", *res.Batches},
+		{"Documents total", *res.Total},
+		{"Documents created", *res.Created},
+		{"Documents deleted", *res.Deleted},
+		{"Documents updated", *res.Updated},
+		{"Requests/s", *res.RequestsPerSecond},
+		{"Timed out", *res.TimedOut},
+		{"Time elapsed", time.Duration(*res.Took) * time.Millisecond},
+		{"Version conflicts", *res.VersionConflicts},
+	}
+
+	return table.Print()
+}

pkg/es/index_template.go

@@ -28,12 +28,29 @@ import (
 
 	"codeberg.org/scip/esctl/pkg/cfg"
 	"codeberg.org/scip/esctl/pkg/printer"
+	"codeberg.org/scip/mapmap"
 	"github.com/elastic/go-elasticsearch/v9/typedapi/esdsl"
 	"github.com/elastic/go-elasticsearch/v9/typedapi/types"
 )
 
 // used for completion
-func IndexTemplateList(conf *cfg.Config) error {
+func IndexTemplateNames(conf *cfg.Config) ([]string, error) {
+	res, err := conf.DefaultCluster.ES().Indices.GetIndexTemplate().
+		Do(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf("failed to get index templates: %w", esErrorString(err))
+	}
+
+	names := make([]string, len(res.IndexTemplates))
+
+	for idx, tpl := range res.IndexTemplates {
+		names[idx] = tpl.Name
+	}
+
+	return names, nil
+}
+
+func IndexTemplateList(conf *cfg.Config, filter string) error {
 	res, err := conf.DefaultCluster.ES().Indices.GetIndexTemplate().
 		Do(context.Background())
 	if err != nil {
@@ -42,16 +59,20 @@ func IndexTemplateList(conf *cfg.Config) error {
 
 	slog.Debug("res", "index templates", res)
 
-	table := printer.NewTable(conf, 5, len(res.IndexTemplates))
+	table := printer.NewTable(conf, 5, 0)
-	table.Addheaders("name", "description", "priority")
+	table.Addheaders("name", "description", "index patterns", "priority")
 
-	for idx, tpl := range res.IndexTemplates {
+	tplList := filterIndexTemplates(conf, filter, res.IndexTemplates)
-		desc, err := json.Marshal(tpl.IndexTemplate.Meta_["description"])
+
-		if err != nil {
+	for _, tpl := range tplList {
-			return fmt.Errorf("failed to unmarshal meta json data: %w", err)
+		desc := strings.TrimPrefix(strings.TrimSuffix(string(tpl.IndexTemplate.Meta_["description"]), `"`), `"`)
+
+		var prio int64
+		if tpl.IndexTemplate.Priority != nil {
+			prio = *tpl.IndexTemplate.Priority
 		}
 
-		table.Entries[idx] = []any{tpl.Name, desc, tpl.IndexTemplate.Priority}
+		table.AddRow(tpl.Name, desc, tpl.IndexTemplate.IndexPatterns, prio)
 	}
 
 	table.Sort()
@@ -59,6 +80,30 @@ func IndexTemplateList(conf *cfg.Config) error {
 	return table.Print()
 }
 
+// Filter index templates by name, index pattern or hidden flag, using
+// mapmap.Slicer
+func filterIndexTemplates(conf *cfg.Config, nameFilter string,
+	templates []types.IndexTemplateItem) []types.IndexTemplateItem {
+	return mapmap.NewSlicer(templates).MapSliceValuesImmutable(func(tpl types.IndexTemplateItem) bool {
+		if !conf.Hidden && strings.HasPrefix(tpl.Name, ".") {
+			return false
+		}
+
+		if nameFilter != "" && !strings.Contains(tpl.Name, nameFilter) {
+			return false
+		}
+
+		if len(conf.Filter) > 0 {
+			if !mapmap.NewSlicer(tpl.IndexTemplate.IndexPatterns).
+				FindSliceInSlice(conf.Filter, strings.Contains) {
+				return false
+			}
+		}
+
+		return true
+	})
+}
+
 func IndexTemplateShow(conf *cfg.Config, tplname string) error {
 	res, err := conf.DefaultCluster.ES().Indices.GetIndexTemplate().
 		Name(tplname).

pkg/es/parallel.go

@@ -19,7 +19,6 @@ package es
 import (
 	"context"
 	"fmt"
-	"sync"
 
 	"codeberg.org/scip/esctl/pkg/cfg"
 	"github.com/elastic/go-elasticsearch/v9"
@@ -61,14 +60,7 @@ type apiResponse struct {
 	which            int
 }
 
-func getApiData(
+func getApiData(conf *cfg.Config, es *elasticsearch.TypedClient, reschan chan apiResponse, which string) {
-	conf *cfg.Config,
-	es *elasticsearch.TypedClient,
-	wg *sync.WaitGroup,
-	reschan chan apiResponse,
-	which string) {
-	defer wg.Done()
-
 	apiRes := apiResponse{}
 
 	var arerr error

pkg/es/role.go

@@ -20,6 +20,8 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"maps"
+	"slices"
 
 	"codeberg.org/scip/esctl/pkg/cfg"
 	"codeberg.org/scip/esctl/pkg/printer"
@@ -33,15 +35,7 @@ func RoleNames(conf *cfg.Config) ([]string, error) {
 		return nil, fmt.Errorf("failed to get roles: %w", esErrorString(err))
 	}
 
-	roles := make([]string, len(res))
+	return slices.Collect(maps.Keys(res)), nil
-
-	idx := 0
-	for name := range res {
-		roles[idx] = name
-		idx++
-	}
-
-	return roles, nil
 }
 
 func RoleList(conf *cfg.Config) error {

pkg/es/role_diff.go

@@ -127,7 +127,7 @@ func getCsvRecord(conf *cfg.Config, csvfile, rolename string) (*Record, error) {
 	}()
 
 	scanner := bufio.NewScanner(fd)
-	record := Record{role: rolename}
+	record := new(Record{role: rolename})
 
 	for scanner.Scan() {
 		line := strings.TrimSpace(scanner.Text())
@@ -150,7 +150,7 @@ func getCsvRecord(conf *cfg.Config, csvfile, rolename string) (*Record, error) {
 		}
 	}
 
-	return &record, nil
+	return record, nil
 }
 
 func diffRoles(conf *cfg.Config, records map[string]Record, res getrole.Response) []Register {

pkg/es/rollover.go

@@ -33,7 +33,7 @@ func RolloverConditions(conf *cfg.Config) types.RolloverConditionsVariant {
 	}
 
 	if conf.MaxDocs > 0 {
-		cond.MaxDocs(int64(conf.MaxDocs))
+		cond.MaxDocs(conf.MaxDocs)
 	}
 
 	if conf.MaxShardSize > 0 {

pkg/es/search.go

@@ -56,7 +56,7 @@ func Search(conf *cfg.Config, queries []string) error {
 		return err
 	}
 
-	req := &search.Request{Query: queryCaster}
+	req := new(search.Request{Query: queryCaster})
 
 	searchEs.Request(req)
 
@@ -128,7 +128,7 @@ func validateSearch(conf *cfg.Config, queries []string) error {
 		return err
 	}
 
-	req := &validatequery.Request{Query: queryCaster}
+	req := new(validatequery.Request{Query: queryCaster})
 
 	validate.Request(req)
 

pkg/es/search_filter.go

@@ -80,7 +80,7 @@ func NewFilter(query string) (*filter, error) {
 		return nil, errors.New("search queries must be in the form field<sep>pattern where <sep> must be one of: = or !=")
 	}
 
-	flt := &filter{term: part[0], filter: part[1], criteria: criteria}
+	flt := new(filter{term: part[0], filter: part[1], criteria: criteria})
 
 	if strings.Contains(part[0], ",") {
 		// a MultiMatchQuery, match across multiple fields at once

pkg/es/snapshot.go

@@ -42,17 +42,17 @@ type Snapshot struct {
 }
 
 func SnapshotList(conf *cfg.Config) error {
-	// get partial indicies
+	// get partial indices
 	ires, err := conf.DefaultCluster.ES().Cat.Indices().Do(context.Background())
 	if err != nil {
-		return fmt.Errorf("failed to get indicies: %w", esErrorString(err))
+		return fmt.Errorf("failed to get indices: %w", esErrorString(err))
 	}
 
-	indicies := map[string]int{}
+	indices := map[string]int{}
 
 	for _, index := range ires {
 		name := strings.ReplaceAll(*index.Index, "partial-", "")
-		indicies[name] = 1
+		indices[name] = 1
 	}
 
 	// get snapshots
@@ -61,20 +61,20 @@ func SnapshotList(conf *cfg.Config) error {
 		return fmt.Errorf("failed to get snapshots: %w", esErrorString(err))
 	}
 
-	slog.Debug("ES result", "indicies", sres)
+	slog.Debug("ES result", "indices", sres)
 
 	snapshots := []*Snapshot{} // original snapshot names
 
 	for _, snapshot := range sres {
-		snap := &Snapshot{
+		snap := new(Snapshot{
 			Name:     *snapshot.Id,
 			Status:   *snapshot.Status,
 			Start:    fmt.Sprintf("%s", snapshot.StartTime),
 			Forindex: indexFromSnapshot(*snapshot.Id),
 			Orphaned: "no",
-		}
+		})
 
-		_, exists := indicies[snap.Forindex]
+		_, exists := indices[snap.Forindex]
 		if !exists {
 			snap.Orphaned = "orphaned"
 		}

pkg/log/logger.go

@@ -29,13 +29,13 @@ import (
 const LevelNotice = slog.Level(2)
 
 func Init(conf *cfg.Config) {
-	logLevel := &slog.LevelVar{}
+	logLevel := new(slog.LevelVar{})
 
-	opts := &yadu.Options{
+	opts := new(yadu.Options{
 		Level:     logLevel,
 		AddSource: true,
 		NoColor:   !isatty.IsTerminal(os.Stdout.Fd()),
-	}
+	})
 
 	buildInfo, _ := debug.ReadBuildInfo()
 

pkg/printer/bytes.go

@@ -27,7 +27,7 @@ func (b *ByteSize) String() string {
 }
 
 func Bytes(size int64) *ByteSize {
-	return &ByteSize{size: uint64(size)}
+	return new(ByteSize{size: uint64(size)})
 }
 
 func ByteString(size int64) string {

pkg/printer/metrics.go

@@ -0,0 +1,55 @@
+/*
+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"
+	"runtime/metrics"
+	"strconv"
+)
+
+func printGoRoutineMetrics() {
+	fmt.Println("\nGoroutine metrics:")
+	printMetric("/sched/goroutines-created:goroutines", "Created")
+	printMetric("/sched/goroutines:goroutines", "Live")
+	printMetric("/sched/goroutines/not-in-go:goroutines", "Syscall/CGO")
+	printMetric("/sched/goroutines/runnable:goroutines", "Runnable")
+	printMetric("/sched/goroutines/running:goroutines", "Running")
+	printMetric("/sched/goroutines/waiting:goroutines", "Waiting")
+
+	fmt.Println("Thread metrics:")
+	printMetric("/sched/gomaxprocs:threads", "Max")
+	printMetric("/sched/threads/total:threads", "Live")
+}
+
+func printMetric(name string, descr string) {
+	sample := []metrics.Sample{{Name: name}}
+	metrics.Read(sample)
+
+	var val string
+
+	switch sample[0].Value.Kind() {
+	case metrics.KindFloat64, metrics.KindFloat64Histogram:
+		val = fmt.Sprintf("%.2f", sample[0].Value.Float64())
+	case metrics.KindUint64:
+		val = strconv.FormatUint(sample[0].Value.Uint64(), 10)
+	case metrics.KindBad:
+		val = "n/a"
+	}
+
+	fmt.Printf("  %s: %v\n", descr, val)
+}

pkg/printer/table.go

@@ -35,15 +35,20 @@ type Table struct {
 	RawHeaders []string
 	Entries    [][]any
 
-	rows       [][]string // representation used for printing
+	rows            [][]string // representation used for printing
-	processed  bool
+	processed       bool
-	lenHeaders []int
+	lenHeaders      []int
-	alignInts  bool
+	alignInts       bool
-	maxwidth   int
+	maxwidth        int
+	debugGoRoutines bool
 }
 
 func NewTable(conf *cfg.Config, columns, rows int) *Table {
-	table := Table{Mode: conf.Output, maxwidth: cfg.GetTermWidth()}
+	table := new(Table{
+		Mode:            conf.Output,
+		maxwidth:        cfg.GetTermWidth(),
+		debugGoRoutines: conf.DebugGoRoutines,
+	})
 
 	table.Headers = make([]string, columns)
 	table.RawHeaders = make([]string, columns)
@@ -51,14 +56,18 @@ func NewTable(conf *cfg.Config, columns, rows int) *Table {
 	table.lenHeaders = make([]int, columns)
 	table.alignInts = conf.AlignInts
 
-	return &table
+	return table
 }
 
 func NewTableEmpty(conf *cfg.Config) *Table {
-	table := Table{Mode: conf.Output, maxwidth: cfg.GetTermWidth()}
+	table := new(Table{
+		Mode:            conf.Output,
+		maxwidth:        cfg.GetTermWidth(),
+		debugGoRoutines: conf.DebugGoRoutines,
+	})
 	table.alignInts = conf.AlignInts
 
-	return &table
+	return table
 }
 
 func (table *Table) WithHeaders(headers ...string) *Table {
@@ -75,16 +84,24 @@ func (table *Table) WithHeaders(headers ...string) *Table {
 }
 
 func (table *Table) Print() error {
+	var err error
+
 	switch table.Mode {
 	case "json":
-		return table.PrintJSON()
+		err = table.PrintJSON()
 	case "yaml":
-		return table.PrintYAML()
+		err = table.PrintYAML()
 	case "csv":
-		return table.PrintCSV()
+		err = table.PrintCSV()
 	default:
-		return table.PrintTSV()
+		err = table.PrintTSV()
 	}
+
+	if table.debugGoRoutines {
+		printGoRoutineMetrics()
+	}
+
+	return err
 }
 
 var (
@@ -149,9 +166,11 @@ func (table *Table) PrintTSV() error {
 				wrapped := wrapper(entry)
 
 				// and indent it
-				for idx, line := range strings.Split(wrapped, "\n") {
+				first := true
-					if idx == 0 {
+				for line := range strings.Lines(wrapped) {
+					if first {
 						entry = line
+						first = false
 					} else {
 						entry += "\n  " + strings.Repeat(" ", currentWidth) + line
 					}