fine tuning, added test, which hangs, but yanking works anyway

Makefile

@@ -69,7 +69,7 @@ test:
 
 singletest:
 	@echo "Call like this: 'make singletest TEST=TestPrepareColumns MOD=lib'"
-	go test -run $(TEST) github.com/tlinden/tablizer/$(MOD)
+	go test -run $(TEST) github.com/tlinden/tablizer/$(MOD) $(OPTS)
 
 cover-report:
 	go test ./... -cover -coverprofile=coverage.out

README.md

@@ -35,6 +35,8 @@ Output Flags (mutually exclusive):
   -C, --csv                         Enable CSV output
   -A, --ascii                       Default output mode, ascii tabular
   -L, --hightlight-lines            Use alternating background colors for tables
+  -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                    space separated
 
 Sort Mode Flags (mutually exclusive):
   -a, --sort-age                    sort according to age (duration) string

cmd/tablizer.go

@@ -30,6 +30,8 @@ SYNOPSIS
           -C, --csv                         Enable CSV output
           -A, --ascii                       Default output mode, ascii tabular
           -L, --hightlight-lines            Use alternating background colors for tables
+          -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                            space separated
 
         Sort Mode Flags (mutually exclusive):
           -a, --sort-age                    sort according to age (duration) string
@@ -267,6 +269,18 @@ DESCRIPTION
     markdown which prints a Markdown table, yaml, which prints yaml encoding
     and CSV mode, which prints a comma separated value file.
 
+  PUT FIELDS TO CLIPBOARD
+    You can let tablizer put fields to the clipboard using the option "-y".
+    This best fits the use-case when the result of your filtering yields
+    just one row. For example:
+
+        cloudctl cluster ls | tablizer -yid matchbox
+
+    If "matchbox" matches one cluster, you can immediately use the id of
+    that cluster somewhere else and paste it. Of course, if there are
+    multiple matches, then all id's will be put into the clipboard separated
+    by one space.
+
   ENVIRONMENT VARIABLES
     tablizer supports certain environment variables which use can use to
     influence program behavior. Commandline flags have always precedence
@@ -416,6 +430,8 @@ Output Flags (mutually exclusive):
   -C, --csv                         Enable CSV output
   -A, --ascii                       Default output mode, ascii tabular
   -L, --hightlight-lines            Use alternating background colors for tables
+  -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                    space separated
 
 Sort Mode Flags (mutually exclusive):
   -a, --sort-age                    sort according to age (duration) string

go.mod

@@ -5,6 +5,7 @@ go 1.22
 require (
 	github.com/alecthomas/repr v0.4.0
 	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de
+	github.com/atotto/clipboard v0.1.4
 	github.com/gookit/color v1.5.4
 	github.com/hashicorp/hcl/v2 v2.23.0
 	github.com/lithammer/fuzzysearch v1.1.8
@@ -18,7 +19,6 @@ require (
 	github.com/agext/levenshtein v1.2.3 // indirect
 	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
-	github.com/atotto/clipboard v0.1.4 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect

lib/printer.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2022 Thomas von Dein
+Copyright © 2022-2025 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
@@ -26,7 +26,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/atotto/clipboard"
 	"github.com/gookit/color"
 	"github.com/olekukonko/tablewriter"
 	"github.com/tlinden/tablizer/cfg"
@@ -266,28 +265,3 @@ func printCSVData(writer io.Writer, data *Tabdata) {
 		log.Fatal(err)
 	}
 }
-
-func yankColumns(conf cfg.Config, data *Tabdata) {
-	var yank string
-
-	if len(data.entries) == 0 || len(conf.UseYankColumns) == 0 {
-		return
-	}
-
-	for _, row := range data.entries {
-		for i, field := range row {
-			for _, idx := range conf.UseYankColumns {
-				if i == idx-1 {
-					yank += field + " "
-				}
-			}
-		}
-	}
-
-	if yank != "" {
-		setprimary()
-		if err := clipboard.WriteAll(yank); err != nil {
-			log.Fatalln("error writing string to clipboard:", err)
-		}
-	}
-}

lib/yank.go

@@ -0,0 +1,51 @@
+/*
+Copyright © 2022-2025 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 lib
+
+import (
+	"log"
+	"strings"
+
+	"github.com/atotto/clipboard"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+func yankColumns(conf cfg.Config, data *Tabdata) {
+	var yank []string
+
+	if len(data.entries) == 0 || len(conf.UseYankColumns) == 0 {
+		return
+	}
+
+	for _, row := range data.entries {
+		for i, field := range row {
+			for _, idx := range conf.UseYankColumns {
+				if i == idx-1 {
+					yank = append(yank, field)
+				}
+			}
+		}
+	}
+
+	if len(yank) > 0 {
+		setprimary()
+		if err := clipboard.WriteAll(strings.Join(yank, " ")); err != nil {
+			log.Fatalln("error writing string to clipboard:", err)
+		}
+	}
+}

lib/yank_test.go

@@ -0,0 +1,70 @@
+/*
+Copyright © 2025 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 lib
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"github.com/atotto/clipboard"
+	"github.com/tlinden/tablizer/cfg"
+)
+
+var yanktests = []struct {
+	name   string
+	yank   []int // -y$colum,$column... after processing
+	filter string
+	expect string
+}{
+	{
+		name:   "one",
+		yank:   []int{1},
+		filter: "beta",
+	},
+}
+
+func DISABLED_TestYankColumns(t *testing.T) {
+	for _, testdata := range yanktests {
+		testname := fmt.Sprintf("yank-%s-filter-%s",
+			testdata.name, testdata.filter)
+		t.Run(testname, func(t *testing.T) {
+			conf := cfg.Config{
+				OutputMode:     cfg.ASCII,
+				UseYankColumns: testdata.yank,
+				NoColor:        true,
+			}
+
+			conf.ApplyDefaults()
+			data := newData() // defined in printer_test.go, reused here
+
+			var writer bytes.Buffer
+			printData(&writer, conf, &data)
+
+			got, err := clipboard.ReadAll() // hangs indefinetly
+			if err != nil {
+				t.Errorf("failed to fetch yanked text from clipboard")
+			}
+
+			if got != testdata.expect {
+				t.Errorf("not yanked correctly:\n+++ got:\n%s\n+++ want:\n%s",
+					got, testdata.expect)
+			}
+		})
+	}
+}

tablizer.1

@@ -1,4 +1,4 @@
-.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.40)
+.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42)
 .\"
 .\" Standard preamble:
 .\" ========================================================================
@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2025-01-22" "1" "User Commands"
+.TH TABLIZER 1 "2025-01-23" "1" "User Commands"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -168,6 +168,8 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-C, \-\-csv                         Enable CSV output
 \&      \-A, \-\-ascii                       Default output mode, ascii tabular
 \&      \-L, \-\-hightlight\-lines            Use alternating background colors for tables
+\&      \-y, \-\-yank\-columns                Yank specified columns (separated by ,) to clipboard,
+\&                                        space separated
 \&
 \&    Sort Mode Flags (mutually exclusive):
 \&      \-a, \-\-sort\-age                    sort according to age (duration) string
@@ -442,6 +444,20 @@ more output modes available: \fBorgtbl\fR  which prints an Emacs org-mode
 table and  \fBmarkdown\fR which prints  a Markdown table,  \fByaml\fR, which
 prints  yaml encoding  and \s-1CSV\s0  mode, which  prints a  comma separated
 value file.
+.SS "\s-1PUT FIELDS TO CLIPBOARD\s0"
+.IX Subsection "PUT FIELDS TO CLIPBOARD"
+You can let tablizer put fields to the clipboard using the option
+\&\f(CW\*(C`\-y\*(C'\fR. This best fits the use-case when the result of your filtering
+yields just one row. For example:
+.PP
+.Vb 1
+\&    cloudctl cluster ls | tablizer \-yid matchbox
+.Ve
+.PP
+If \*(L"matchbox\*(R" matches one cluster, you can immediately use the id of
+that cluster somewhere else and paste it. Of course, if there are
+multiple matches, then all id's will be put into the clipboard
+separated by one space.
 .SS "\s-1ENVIRONMENT VARIABLES\s0"
 .IX Subsection "ENVIRONMENT VARIABLES"
 \&\fBtablizer\fR supports  certain environment variables which  use can use

tablizer.pod

@@ -29,6 +29,8 @@ tablizer - Manipulate tabular output of other programs
       -C, --csv                         Enable CSV output
       -A, --ascii                       Default output mode, ascii tabular
       -L, --hightlight-lines            Use alternating background colors for tables
+      -y, --yank-columns                Yank specified columns (separated by ,) to clipboard,
+                                        space separated
 
     Sort Mode Flags (mutually exclusive):
       -a, --sort-age                    sort according to age (duration) string
@@ -290,6 +292,19 @@ table and  B<markdown> which prints  a Markdown table,  B<yaml>, which
 prints  yaml encoding  and CSV  mode, which  prints a  comma separated
 value file.
 
+=head2 PUT FIELDS TO CLIPBOARD
+
+You can let tablizer put fields to the clipboard using the option
+C<-y>. This best fits the use-case when the result of your filtering
+yields just one row. For example:
+
+    cloudctl cluster ls | tablizer -yid matchbox
+
+If "matchbox" matches one cluster, you can immediately use the id of
+that cluster somewhere else and paste it. Of course, if there are
+multiple matches, then all id's will be put into the clipboard
+separated by one space.
+
 =head2 ENVIRONMENT VARIABLES
 
 B<tablizer> supports  certain environment variables which  use can use