added -v flag, replace 'help' subcommand wich -m, more tests

cmd/root.go

@@ -18,33 +18,31 @@ package cmd
 
 import (
 	"bytes"
-	"github.com/tlinden/tablizer/lib"
 	"fmt"
 	"github.com/spf13/cobra"
+	"github.com/tlinden/tablizer/lib"
 	"log"
 	"os"
 	"os/exec"
 )
 
-var helpCmd = &cobra.Command{
-	Use:   "help",
-	Short: "Show documentation",
-	Run: func(cmd *cobra.Command, args []string) {
-		man := exec.Command("less", "-")
+var ShowManual = false
 
-		var b bytes.Buffer
-		b.Write([]byte(manpage))
+func man() {
+	man := exec.Command("less", "-")
 
-		man.Stdout = os.Stdout
-		man.Stdin = &b
-		man.Stderr = os.Stderr
+	var b bytes.Buffer
+	b.Write([]byte(manpage))
 
-		err := man.Run()
+	man.Stdout = os.Stdout
+	man.Stdin = &b
+	man.Stderr = os.Stderr
 
-		if err != nil {
-			log.Fatal(err)
-		}
-	},
+	err := man.Run()
+
+	if err != nil {
+		log.Fatal(err)
+	}
 }
 
 var rootCmd = &cobra.Command{
@@ -57,6 +55,11 @@ var rootCmd = &cobra.Command{
 			return nil
 		}
 
+		if ShowManual {
+			man()
+			return nil
+		}
+
 		err := lib.PrepareColumns()
 		if err != nil {
 			return err
@@ -81,7 +84,9 @@ func Execute() {
 func init() {
 	rootCmd.PersistentFlags().BoolVarP(&lib.Debug, "debug", "d", false, "Enable debugging")
 	rootCmd.PersistentFlags().BoolVarP(&lib.NoNumbering, "no-numbering", "n", false, "Disable header numbering")
-	rootCmd.PersistentFlags().BoolVarP(&lib.ShowVersion, "version", "v", false, "Print program version")
+	rootCmd.PersistentFlags().BoolVarP(&lib.ShowVersion, "version", "V", false, "Print program version")
+	rootCmd.PersistentFlags().BoolVarP(&lib.InvertMatch, "invert-match", "v", false, "select non-matching rows")
+	rootCmd.PersistentFlags().BoolVarP(&ShowManual, "man", "m", false, "Display manual page")
 	rootCmd.PersistentFlags().StringVarP(&lib.Separator, "separator", "s", "", "Custom field separator")
 	rootCmd.PersistentFlags().StringVarP(&lib.Columns, "columns", "c", "", "Only show the speficied columns (separated by ,)")
 
@@ -98,11 +103,4 @@ func init() {
 
 	// same thing but more common, takes precedence over above group
 	rootCmd.PersistentFlags().StringVarP(&lib.OutputMode, "output", "o", "", "Output mode - one of: orgtbl, markdown, extended, shell, ascii(default)")
-
-	rootCmd.AddCommand(helpCmd)
-
-	rootCmd.SetHelpCommand(&cobra.Command{
-		Use:    "no-help",
-		Hidden: true,
-	})
 }

cmd/tablizer.go

@@ -11,6 +11,8 @@ SYNOPSIS
           -c, --columns string     Only show the speficied columns (separated by ,)
           -d, --debug              Enable debugging
           -h, --help               help for tablizer
+          -v, --invert-match       select non-matching rows
+          -m, --man                Display manual page
           -n, --no-numbering       Disable header numbering
           -o, --output string      Output mode - one of: orgtbl, markdown, extended, ascii(default)
           -X, --extended           Enable extended output
@@ -38,7 +40,8 @@ DESCRIPTION
 
     Without any options it reads its input from "STDIN", but you can also
     specify a file as a parameter. If you want to reduce the output by some
-    regular expression, just specify it as its first parameters. Hence:
+    regular expression, just specify it as its first parameter. You may also
+    use the -v option to exclude all rows which match the pattern. Hence:
 
        # read from STDIN
        kubectl get pods | tablizer

lib/common.go

@@ -31,12 +31,13 @@ var (
 	OutflagOrgtable bool
 	OutflagShell    bool
 	OutputMode      string
+	InvertMatch     bool
 
 	// used for validation
 	validOutputmodes = "(orgtbl|markdown|extended|ascii)"
 
 	// main program version
-	Version = "v1.0.4"
+	Version = "v1.0.5"
 
 	// generated  version string, used  by -v contains  lib.Version on
 	//  main  branch,   and  lib.Version-$branch-$lastcommit-$date  on

lib/parser.go

@@ -114,7 +114,11 @@ func parseFile(input io.Reader, pattern string) (Tabdata, error) {
 		} else {
 			// data processing
 			if len(pattern) > 0 {
-				if !patternR.MatchString(line) {
+				if patternR.MatchString(line) == InvertMatch {
+					// by default  -v is false, so if a  line does NOT
+					// match the pattern, we will ignore it. However,
+					// if the user specified -v, the matching is inverted,
+					// so we ignore all lines, which DO match.
 					continue
 				}
 			}
@@ -151,7 +155,7 @@ func parseFile(input io.Reader, pattern string) (Tabdata, error) {
 	}
 
 	if scanner.Err() != nil {
-		return data, errors.Unwrap(fmt.Errorf("Regexp pattern %s is invalid: %w", pattern, scanner.Err()))
+		return data, errors.Unwrap(fmt.Errorf("Failed to read from io.Reader: %w", scanner.Err()))
 	}
 
 	if Debug {

lib/parser_test.go

@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package lib
 
 import (
+	"fmt"
 	"reflect"
 	"strings"
 	"testing"
@@ -80,3 +81,57 @@ asd    igig   cxxxncnc
 		t.Errorf("Parser returned invalid data\nExp: %+v\nGot: %+v\n", data, gotdata)
 	}
 }
+
+func TestParserPatternmatching(t *testing.T) {
+	var tests = []struct {
+		entries [][]string
+		pattern string
+		invert  bool
+	}{
+		{
+			entries: [][]string{
+				[]string{
+					"asd",
+					"igig",
+					"cxxxncnc",
+				},
+			},
+			pattern: "ig",
+			invert:  false,
+		},
+		{
+			entries: [][]string{
+				[]string{
+					"19191",
+					"EDD 1",
+					"X",
+				},
+			},
+			pattern: "ig",
+			invert:  true,
+		},
+	}
+
+	table := `ONE    TWO    THREE  
+asd    igig   cxxxncnc  
+19191  EDD 1  X`
+
+	for _, tt := range tests {
+		testname := fmt.Sprintf("parse-with-inverted-pattern-%t", tt.invert)
+		t.Run(testname, func(t *testing.T) {
+			InvertMatch = tt.invert
+
+			readFd := strings.NewReader(table)
+			gotdata, err := parseFile(readFd, tt.pattern)
+
+			if err != nil {
+				t.Errorf("Parser returned error: %s\nData processed so far: %+v", err, gotdata)
+			}
+
+			if !reflect.DeepEqual(tt.entries, gotdata.entries) {
+				t.Errorf("Parser returned invalid data (pattern: %s, invert: %t)\nExp: %+v\nGot: %+v\n",
+					tt.pattern, tt.invert, tt.entries, gotdata.entries)
+			}
+		})
+	}
+}

tablizer.1

@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "TABLIZER 1"
-.TH TABLIZER 1 "2022-10-04" "1" "User Commands"
+.TH TABLIZER 1 "2022-10-05" "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
@@ -150,6 +150,8 @@ tablizer \- Manipulate tabular output of other programs
 \&      \-c, \-\-columns string     Only show the speficied columns (separated by ,)
 \&      \-d, \-\-debug              Enable debugging
 \&      \-h, \-\-help               help for tablizer
+\&      \-v, \-\-invert\-match       select non\-matching rows
+\&      \-m, \-\-man                Display manual page
 \&      \-n, \-\-no\-numbering       Disable header numbering
 \&      \-o, \-\-output string      Output mode \- one of: orgtbl, markdown, extended, ascii(default)
 \&      \-X, \-\-extended           Enable extended output
@@ -179,8 +181,9 @@ positions.
 .PP
 Without any options it reads its input from \f(CW\*(C`STDIN\*(C'\fR, but you can also
 specify a  file as a  parameter. If you want  to reduce the  output by
-some   regular   expression,   just    specify   it   as   its   first
-parameters. Hence:
+some regular expression,  just specify it as its  first parameter. You
+may also  use the  \fB\-v\fR option  to exclude all  rows which  match the
+pattern. Hence:
 .PP
 .Vb 2
 \&   # read from STDIN

tablizer.pod

@@ -11,6 +11,8 @@ tablizer - Manipulate tabular output of other programs
       -c, --columns string     Only show the speficied columns (separated by ,)
       -d, --debug              Enable debugging
       -h, --help               help for tablizer
+      -v, --invert-match       select non-matching rows
+      -m, --man                Display manual page
       -n, --no-numbering       Disable header numbering
       -o, --output string      Output mode - one of: orgtbl, markdown, extended, ascii(default)
       -X, --extended           Enable extended output
@@ -41,8 +43,9 @@ positions.
 
 Without any options it reads its input from C<STDIN>, but you can also
 specify a  file as a  parameter. If you want  to reduce the  output by
-some   regular   expression,   just    specify   it   as   its   first
-parameters. Hence:
+some regular expression,  just specify it as its  first parameter. You
+may also  use the  B<-v> option  to exclude all  rows which  match the
+pattern. Hence:
 
    # read from STDIN
    kubectl get pods | tablizer