Add horizontal scroll by specified amount

go.mod

@@ -5,11 +5,11 @@ go 1.19
 require (
 	code.rocketnine.space/tslocum/cbind v0.1.5
 	github.com/atotto/clipboard v0.1.4
-	github.com/fsnotify/fsnotify v1.6.0
+	github.com/fsnotify/fsnotify v1.7.0
 	github.com/gdamore/tcell/v2 v2.6.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/jwalton/gchalk v1.3.0
-	github.com/klauspost/compress v1.17.0
+	github.com/klauspost/compress v1.17.2
 	github.com/mattn/go-runewidth v0.0.15
 	github.com/noborus/guesswidth v0.3.4
 	github.com/pierrec/lz4 v2.6.1+incompatible

go.sum

@@ -61,8 +61,8 @@ github.com/envoyproxy/go-control-plane v0.9.7/go.mod h1:cwu0lG7PUMfa9snN8LXBig5y
 github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/frankban/quicktest v1.14.4 h1:g2rn0vABPOOXmZUj+vbmUp0lPoXEMuhTpIluN0XL9UY=
-github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
-github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
 github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
 github.com/gdamore/tcell/v2 v2.2.0/go.mod h1:cTTuF84Dlj/RqmaCIV5p4w8uG1zWdk0SF6oBpwHp4fU=
@@ -144,8 +144,8 @@ github.com/jwalton/go-supportscolor v1.1.0/go.mod h1:hFVUAZV2cWg+WFFC4v8pT2X/S2q
 github.com/jwalton/go-supportscolor v1.2.0 h1:g6Ha4u7Vm3LIsQ5wmeBpS4gazu0UP1DRDE8y6bre4H8=
 github.com/jwalton/go-supportscolor v1.2.0/go.mod h1:hFVUAZV2cWg+WFFC4v8pT2X/S2qUUBYMioBD9AINXGs=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/klauspost/compress v1.17.0 h1:Rnbp4K9EjcDuVuHtd0dgA4qNuv9yKDYKK1ulpJwgrqM=
-github.com/klauspost/compress v1.17.0/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/klauspost/compress v1.17.2 h1:RlWWUY/Dr4fL8qk9YG7DTZ7PDgME2V4csBXA8L/ixi4=
+github.com/klauspost/compress v1.17.2/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
 github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
@@ -364,7 +364,6 @@ golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211004093028-2c5d950f24ef/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

main.go

@@ -386,6 +386,9 @@ func init() {
 	rootCmd.PersistentFlags().StringP("jump-target", "j", "", "jump target `[int|int%|.int|'section']`")
 	_ = viper.BindPFlag("general.JumpTarget", rootCmd.PersistentFlags().Lookup("jump-target"))
 
+	rootCmd.PersistentFlags().StringP("hscroll-width", "", "10%", "width to scroll horizontally `[int|int%|.int]`")
+	_ = viper.BindPFlag("general.HScrollWidth", rootCmd.PersistentFlags().Lookup("hscroll-width"))
+
 	// Config
 	rootCmd.PersistentFlags().BoolP("disable-mouse", "", false, "disable mouse support")
 	_ = viper.BindPFlag("DisableMouse", rootCmd.PersistentFlags().Lookup("disable-mouse"))

oviewer/action.go

@@ -194,7 +194,7 @@ func (root *Root) goLine(input string) {
 	if len(input) == 0 {
 		return
 	}
-	num := docPosition(root.Doc.BufEndNum(), input)
+	num := calculatePosition(root.Doc.BufEndNum(), input)
 	str := strconv.FormatFloat(num, 'f', 1, 64)
 	if strings.HasSuffix(str, ".0") {
 		// Line number only.
@@ -538,17 +538,17 @@ func jumpPosition(height int, str string) (int, bool) {
 	if len(s) > 0 && s[0] == 's' {
 		return 0, true
 	}
-	num := int(math.Round(docPosition(height, s)))
+	num := int(math.Round(calculatePosition(height, s)))
 	if num < 0 {
 		return (height - 1) + num, false
 	}
 	return num, false
 }
 
-// docPosition returns the number of lines from the top for positive
-// numbers (1), dot.number for percentages (.5) = 50%, and % after
-// the number for percentages (50%).
-func docPosition(height int, str string) float64 {
+// CalculatePosition returns the number from the length for positive
+// numbers (1), returns dot.number for percentages (.5) = 50%,
+// and returns the % after the number for percentages (50%). return.
+func calculatePosition(length int, str string) float64 {
 	var p float64 = 0
 	if strings.HasPrefix(str, ".") {
 		str = strings.TrimLeft(str, ".")
@@ -568,7 +568,7 @@ func docPosition(height int, str string) float64 {
 	}
 
 	if p != 0 {
-		return float64(height) * p
+		return float64(length) * p
 	}
 
 	num, err := strconv.ParseFloat(str, 64)

oviewer/action_test.go

@@ -171,7 +171,7 @@ func Test_position(t *testing.T) {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
-			if got := docPosition(tt.args.height, tt.args.str); got != tt.want {
+			if got := calculatePosition(tt.args.height, tt.args.str); got != tt.want {
 				t.Errorf("position() = %v, want %v", got, tt.want)
 			}
 		})

oviewer/help.go

@@ -25,6 +25,7 @@ func NewHelp(k KeyBind) (*Document, error) {
 	m.store.eof = 1
 	m.preventReload = true
 	m.seekable = false
+	m.SectionHeader = true
 	m.setSectionDelimiter("\t")
 	atomic.StoreInt32(&m.closed, 1)
 	if err := m.ControlReader(helpStr, nil); err != nil {

oviewer/keybind.go

@@ -32,6 +32,8 @@ const (
 	actionMoveDown       = "down"
 	actionMoveUp         = "up"
 	actionMoveTop        = "top"
+	actionMoveWidthLeft  = "width_left"
+	actionMoveWidthRight = "width_right"
 	actionMoveLeft       = "left"
 	actionMoveRight      = "right"
 	actionMoveHfLeft     = "half_left"
@@ -114,6 +116,8 @@ func (root *Root) handlers() map[string]func() {
 		actionMovePgDn:       root.movePgDn,
 		actionMoveHfUp:       root.moveHfUp,
 		actionMoveHfDn:       root.moveHfDn,
+		actionMoveWidthLeft:  root.moveWidthLeft,
+		actionMoveWidthRight: root.moveWidthRight,
 		actionMoveLeft:       root.moveLeftOne,
 		actionMoveRight:      root.moveRightOne,
 		actionMoveHfLeft:     root.moveHfLeft,
@@ -194,6 +198,8 @@ func defaultKeyBinds() KeyBind {
 		actionMovePgDn:       {"PageDown", "ctrl+v"},
 		actionMoveHfUp:       {"ctrl+u"},
 		actionMoveHfDn:       {"ctrl+d"},
+		actionMoveWidthLeft:  {"ctrl+shift+left"},
+		actionMoveWidthRight: {"ctrl+shift+right"},
 		actionMoveLeft:       {"left"},
 		actionMoveRight:      {"right"},
 		actionMoveHfLeft:     {"ctrl+left"},
@@ -277,6 +283,8 @@ func (k KeyBind) String() string {
 	k.writeKeyBind(&b, actionMoveRight, "scroll to right")
 	k.writeKeyBind(&b, actionMoveHfLeft, "scroll left half screen")
 	k.writeKeyBind(&b, actionMoveHfRight, "scroll right half screen")
+	k.writeKeyBind(&b, actionMoveWidthLeft, "scroll left specified width")
+	k.writeKeyBind(&b, actionMoveWidthRight, "scroll right specified width")
 	k.writeKeyBind(&b, actionMoveBeginLeft, "go to beginning of line")
 	k.writeKeyBind(&b, actionMoveEndRight, "go to end of line")
 	k.writeKeyBind(&b, actionGoLine, "go to line(input number or `.n` or `n%` allowed)")

oviewer/mouse.go

@@ -74,7 +74,7 @@ func (root *Root) wheelRight() {
 	if root.Doc.ColumnMode {
 		root.moveRightOne()
 	} else {
-		root.moveRight(4)
+		root.moveRight(root.Doc.HScrollWidthNum)
 	}
 }
 
@@ -83,7 +83,7 @@ func (root *Root) wheelLeft() {
 	if root.Doc.ColumnMode {
 		root.moveLeftOne()
 	} else {
-		root.moveLeft(4)
+		root.moveLeft(root.Doc.HScrollWidthNum)
 	}
 }
 

oviewer/move.go

@@ -157,13 +157,25 @@ func (root *Root) moveRightOne() {
 	root.moveRight(1)
 }
 
+// Move to the width of the screen to the left.
+// Called from a EventKey.
+func (root *Root) moveWidthLeft() {
+	root.moveLeft(root.Doc.HScrollWidthNum)
+}
+
+// Move to the width of the screen to the right.
+// Called from a EventKey.
+func (root *Root) moveWidthRight() {
+	root.moveRight(root.Doc.HScrollWidthNum)
+}
+
 // Move left by n amount.
 func (root *Root) moveLeft(n int) {
 	root.resetSelect()
 	defer root.releaseEventBuffer()
 
 	if root.Doc.ColumnMode {
-		root.moveColumnLeft(n)
+		root.moveColumnLeft(1)
 		return
 	}
 	root.moveNormalLeft(n)
@@ -175,7 +187,7 @@ func (root *Root) moveRight(n int) {
 	defer root.releaseEventBuffer()
 
 	if root.Doc.ColumnMode {
-		root.moveColumnRight(n)
+		root.moveColumnRight(1)
 		return
 	}
 	root.moveNormalRight(n)

oviewer/oviewer.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"math"
 	"os"
 	"os/signal"
 	"path/filepath"
@@ -129,6 +130,10 @@ type general struct {
 	MarkStyleWidth int
 	// SectionStartPosition is a section start position.
 	SectionStartPosition int
+	// HScrollWidth is the horizontal scroll width.
+	HScrollWidth string
+	// HScrollWidthNum is the horizontal scroll width.
+	HScrollWidthNum int
 	// AlternateRows alternately style rows.
 	AlternateRows bool
 	// ColumnMode is column mode.
@@ -866,6 +871,9 @@ func mergeGeneral(src general, dst general) general {
 	if dst.JumpTarget != "" {
 		src.JumpTarget = dst.JumpTarget
 	}
+	if dst.HScrollWidth != "" {
+		src.HScrollWidth = dst.HScrollWidth
+	}
 	if len(dst.MultiColorWords) > 0 {
 		src.MultiColorWords = dst.MultiColorWords
 	}
@@ -880,6 +888,8 @@ func (root *Root) prepareView() {
 	// Do not allow size 0.
 	root.scr.vWidth = max(root.scr.vWidth, 1)
 	root.scr.vHeight = max(root.scr.vHeight, 1)
+	num := int(math.Round(calculatePosition(root.scr.vWidth, root.Doc.HScrollWidth)))
+	root.Doc.HScrollWidthNum = max(num, 1)
 	root.scr.numbers = make([]LineNumber, root.scr.vHeight+1)
 	root.Doc.statusPos = root.scr.vHeight - statusLine
 }