Add style tests.

Also this fixes #111.

get.go

@@ -185,6 +185,11 @@ func (s Style) GetMarginLeft() int {
 	return s.getAsInt(marginLeftKey)
 }
 
+// GetMarginBackground returns the style's margin background color.
+func (s Style) GetMarginBackground() TerminalColor {
+	return s.getAsColor(marginBackgroundKey)
+}
+
 // GetHorizontalMargins returns the style's left and right margins. Unset
 // values are measured as 0.
 func (s Style) GetHorizontalMargins() int {

go.mod

@@ -3,6 +3,7 @@ module github.com/charmbracelet/lipgloss
 go 1.15
 
 require (
+	github.com/knz/lipgloss-convert v0.2.0
 	github.com/mattn/go-runewidth v0.0.14
 	github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68
 	github.com/muesli/termenv v0.11.1-0.20220204035834-5ac8409525e0

go.sum

@@ -1,6 +1,17 @@
+github.com/charmbracelet/lipgloss v0.6.0/go.mod h1:tHh2wr34xcHjC2HCXIlGSG1jaDF0S0atAUvBMP6Ppuk=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/knz/lipgloss-convert v0.2.0 h1:i8XqITC65kKPSTslA1XrIUrDvKKwKeJt/NjGk/6RQc0=
+github.com/knz/lipgloss-convert v0.2.0/go.mod h1:MMjNmSKywIG34aHj/nf4tJypUJl11VYmvJvL4kFvkRM=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
+github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
@@ -18,6 +29,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
+github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
@@ -27,8 +40,10 @@ github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKs
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

style_extra_test.go

@@ -0,0 +1,105 @@
+package lipgloss_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/charmbracelet/lipgloss"
+	lipglossc "github.com/knz/lipgloss-convert"
+)
+
+type S = lipgloss.Style
+
+func TestStyle(t *testing.T) {
+	td := []struct {
+		changeStyle func(S) S
+		repr        string
+	}{
+		{func(s S) S { return s.AlignHorizontal(0.5) }, `align-horizontal: 0.5;`},
+		{func(s S) S { return s.Background(lipgloss.Color("#0f0")) }, `background: #0f0;`},
+		{func(s S) S { return s.Blink(true) }, `blink: true;`},
+		{func(s S) S { return s.Bold(true) }, `bold: true;`},
+		{func(s S) S { return s.BorderBottom(true) }, `border-bottom: true;`},
+		{func(s S) S { return s.BorderBottomBackground(lipgloss.Color("#0f0")) }, `border-bottom-background: #0f0;`},
+		{func(s S) S { return s.BorderBottomForeground(lipgloss.Color("#0f0")) }, `border-bottom-foreground: #0f0;`},
+		{func(s S) S { return s.BorderLeft(true) }, `border-left: true;`},
+		{func(s S) S { return s.BorderLeftBackground(lipgloss.Color("#0f0")) }, `border-left-background: #0f0;`},
+		{func(s S) S { return s.BorderLeftForeground(lipgloss.Color("#0f0")) }, `border-left-foreground: #0f0;`},
+		{func(s S) S { return s.BorderRight(true) }, `border-right: true;`},
+		{func(s S) S { return s.BorderRightBackground(lipgloss.Color("#0f0")) }, `border-right-background: #0f0;`},
+		{func(s S) S { return s.BorderRightForeground(lipgloss.Color("#0f0")) }, `border-right-foreground: #0f0;`},
+		{func(s S) S {
+			return s.BorderStyle(lipgloss.Border{"a", "b", "c", "d", "e", "f", "g", "h"})
+		}, `border-style: border("a","b","c","d","e","f","g","h");`},
+		{func(s S) S { return s.BorderTop(true) }, `border-top: true;`},
+		{func(s S) S { return s.BorderTopBackground(lipgloss.Color("#0f0")) }, `border-top-background: #0f0;`},
+		{func(s S) S { return s.BorderTopForeground(lipgloss.Color("#0f0")) }, `border-top-foreground: #0f0;`},
+		{func(s S) S {
+			return s.Border(lipgloss.Border{"a", "b", "c", "d", "e", "f", "g", "h"}, true)
+		}, `border-bottom: true; border-left: true; border-right: true; ` +
+			`border-style: border("a","b","c","d","e","f","g","h"); ` +
+			`border-top: true;`},
+		{func(s S) S { return s.BorderBackground(lipgloss.Color("#0f0")) }, `border-bottom-background: #0f0; border-left-background: #0f0; border-right-background: #0f0; border-top-background: #0f0;`},
+		{func(s S) S { return s.BorderForeground(lipgloss.Color("#0f0")) }, `border-bottom-foreground: #0f0; border-left-foreground: #0f0; border-right-foreground: #0f0; border-top-foreground: #0f0;`},
+
+		{func(s S) S { return s.ColorWhitespace(true) }, `color-whitespace: true;`},
+		{func(s S) S { return s.Faint(true) }, `faint: true;`},
+		{func(s S) S { return s.Foreground(lipgloss.Color("#0f0")) }, `foreground: #0f0;`},
+		{func(s S) S { return s.Height(3) }, `height: 3;`},
+		{func(s S) S { return s.Inline(true) }, `inline: true;`},
+		{func(s S) S { return s.Italic(true) }, `italic: true;`},
+		{func(s S) S { return s.Margin(1, 2, 3, 4) }, `margin-bottom: 3; margin-left: 4; margin-right: 2; margin-top: 1;`},
+		{func(s S) S { return s.MarginBottom(3) }, `margin-bottom: 3;`},
+		{func(s S) S { return s.MarginLeft(3) }, `margin-left: 3;`},
+		{func(s S) S { return s.MarginRight(3) }, `margin-right: 3;`},
+		{func(s S) S { return s.MarginTop(3) }, `margin-top: 3;`},
+		{func(s S) S { return s.MarginBackground(lipgloss.Color("#0f0")) }, `margin-background: #0f0;`},
+		{func(s S) S { return s.MaxHeight(3) }, `max-height: 3;`},
+		{func(s S) S { return s.MaxWidth(3) }, `max-width: 3;`},
+		{func(s S) S { return s.Padding(1, 2, 3, 4) }, `padding-bottom: 3; padding-left: 4; padding-right: 2; padding-top: 1;`},
+		{func(s S) S { return s.PaddingBottom(3) }, `padding-bottom: 3;`},
+		{func(s S) S { return s.PaddingLeft(3) }, `padding-left: 3;`},
+		{func(s S) S { return s.PaddingRight(3) }, `padding-right: 3;`},
+		{func(s S) S { return s.PaddingTop(3) }, `padding-top: 3;`},
+		{func(s S) S { return s.Reverse(true) }, `reverse: true;`},
+		{func(s S) S { return s.Strikethrough(true) }, `strikethrough: true;`},
+		{func(s S) S { return s.StrikethroughSpaces(true) }, `strikethrough-spaces: true;`},
+		{func(s S) S { return s.Underline(true) }, `underline: true;`},
+		{func(s S) S { return s.UnderlineSpaces(true) }, `underline-spaces: true;`},
+		{func(s S) S { return s.Width(3) }, `width: 3;`},
+	}
+
+	for _, tc := range td {
+		// Apply the style change and compare to the reference.
+		s := lipgloss.NewStyle()
+		s = tc.changeStyle(s)
+		repr := lipglossc.Export(s)
+		if repr != tc.repr {
+			t.Errorf("expected %q, got %q", tc.repr, repr)
+			continue
+		}
+
+		// Apply the unset function and assert the resulting style is
+		// empty.
+		r := strings.Split(tc.repr, ":")
+		if len(r) > 2 {
+			// Special case: border-background / border-foreground.
+			if strings.HasPrefix(r[0], "border-") && strings.HasSuffix(r[0], "ground") {
+				r[0] = "border-" + r[0][strings.LastIndexByte(r[0], '-')+1:]
+			} else {
+				// Special case: padding, margin, border etc.
+				r[0] = r[0][:strings.IndexByte(r[0], '-')]
+			}
+		}
+		unset := r[0] + ": unset"
+		u, err := lipglossc.Import(s, unset)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		repr = lipglossc.Export(u)
+		if repr != "" {
+			t.Errorf("expected empty style, got %q", repr)
+		}
+	}
+}

unset.go

@@ -124,15 +124,21 @@ func (s Style) UnsetColorWhitespace() Style {
 	return s
 }
 
-// UnsetMargins removes all margin style rules.
-func (s Style) UnsetMargins() Style {
+// UnsetMargin removes all margin style rules.
+func (s Style) UnsetMargin() Style {
 	delete(s.rules, marginLeftKey)
 	delete(s.rules, marginRightKey)
 	delete(s.rules, marginTopKey)
 	delete(s.rules, marginBottomKey)
 	return s
 }
 
+// UnsetMargins is the old name for UnsetMargin.
+// Preserved for compatibility.
+func (s Style) UnsetMargins() Style {
+	return s.UnsetMargin()
+}
+
 // UnsetMarginLeft removes the left margin style rule, if set.
 func (s Style) UnsetMarginLeft() Style {
 	delete(s.rules, marginLeftKey)
@@ -165,6 +171,16 @@ func (s Style) UnsetMarginBackground() Style {
 	return s
 }
 
+// UnsetBorder removes the border properties, if set.
+func (s Style) UnsetBorder() Style {
+	delete(s.rules, borderTopKey)
+	delete(s.rules, borderBottomKey)
+	delete(s.rules, borderLeftKey)
+	delete(s.rules, borderRightKey)
+	delete(s.rules, borderStyleKey)
+	return s
+}
+
 // UnsetBorderStyle removes the border style rule, if set.
 func (s Style) UnsetBorderStyle() Style {
 	delete(s.rules, borderStyleKey)
@@ -242,13 +258,19 @@ func (s Style) UnsetBorderBackground() Style {
 	return s
 }
 
-// UnsetBorderTopBackgroundColor removes the top border background color rule,
+// UnsetBorderTopBackground removes the top border background color rule,
 // if set.
-func (s Style) UnsetBorderTopBackgroundColor() Style {
+func (s Style) UnsetBorderTopBackground() Style {
 	delete(s.rules, borderTopBackgroundKey)
 	return s
 }
 
+// UnsetBorderTopBackgroundColor is an old name for UnsetBorderTopBackground.
+// Preserved for compatibility.
+func (s Style) UnsetBorderTopBackgroundColor() Style {
+	return s.UnsetBorderTopBackground()
+}
+
 // UnsetBorderRightBackground removes the right border background color
 // rule, if set.
 func (s Style) UnsetBorderRightBackground() Style {