Mark hyperlinks with the OSC hyperlink terminal escape

This makes multi-line links properly clickable.

See: https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda

4 files changed, 88 insertions, 3 deletions

diff --git a/go.mod b/go.mod
index 88f4550..fe4bd18 100644
--- a/go.mod
+++ b/go.mod
@@ -8,4 +8,7 @@ require (
 	golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf
 	golang.org/x/time v0.0.0-20210611083556-38a9dc6acbc6
 	gopkg.in/yaml.v2 v2.3.0
+	mvdan.cc/xurls/v2 v2.3.0
 )
+
+replace github.com/gdamore/tcell/v2 => github.com/hhirtz/tcell/v2 v2.3.12-0.20210807133752-5d743c3ab0c9
diff --git a/go.sum b/go.sum
index c64f2e8..634a5bd 100644
--- a/go.sum
+++ b/go.sum
@@ -1,13 +1,20 @@
 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 v2.3.11 h1:ECO6WqHGbKZ3HrSL7bG/zArMCmLaNr5vcjjMVnLHpzc=
-github.com/gdamore/tcell/v2 v2.3.11/go.mod h1:cTTuF84Dlj/RqmaCIV5p4w8uG1zWdk0SF6oBpwHp4fU=
+github.com/hhirtz/tcell/v2 v2.3.12-0.20210807133752-5d743c3ab0c9 h1:YE0ZsDHfDGR0MeB6YLSGW8tjoxOXZKX3XbB0ytGDX4M=
+github.com/hhirtz/tcell/v2 v2.3.12-0.20210807133752-5d743c3ab0c9/go.mod h1:cTTuF84Dlj/RqmaCIV5p4w8uG1zWdk0SF6oBpwHp4fU=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
 github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rogpeppe/go-internal v1.8.0/go.mod h1:WmiCO8CzOY8rg0OYDC4/i/2WRWAB6poM+XZ2dLUbcbE=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201210144234-2321bbc49cbf h1:MZ2shdL+ZM/XzY3ZGOnh4Nlpnxz5GSOhOmtHo3iPU6M=
@@ -16,7 +23,11 @@ golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/time v0.0.0-20210611083556-38a9dc6acbc6 h1:Vv0JUPWTyeqUq42B2WJ1FeIDjjvGKoA2Ss+Ts0lAVbs=
 golang.org/x/time v0.0.0-20210611083556-38a9dc6acbc6/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
-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.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+mvdan.cc/xurls/v2 v2.3.0 h1:59Olnbt67UKpxF1EwVBopJvkSUBmgtb468E4GVWIZ1I=
+mvdan.cc/xurls/v2 v2.3.0/go.mod h1:AjuTy7gEiUArFMjgBBDU4SMxlfUYsRokpJQgNWOt3e4=
diff --git a/ui/buffers.go b/ui/buffers.go
index 8285fc6..3e13302 100644
--- a/ui/buffers.go
+++ b/ui/buffers.go
@@ -302,6 +302,10 @@ func (bs *BufferList) AddLine(netID, title string, notify NotifyType, line Line)
 	n := len(b.lines)
 	line.At = line.At.UTC()
 
+	if !line.Mergeable {
+		line.Body = line.Body.ParseURLs()
+	}
+
 	if line.Mergeable && n != 0 && b.lines[n-1].Mergeable {
 		l := &b.lines[n-1]
 		newBody := new(StyledStringBuilder)
@@ -338,9 +342,11 @@ func (bs *BufferList) AddLines(netID, title string, before, after []Line) {
 	b := &bs.list[idx]
 
 	for i := 0; i < len(before); i++ {
+		before[i].Body = before[i].Body.ParseURLs()
 		before[i].computeSplitPoints()
 	}
 	for i := 0; i < len(after); i++ {
+		after[i].Body = after[i].Body.ParseURLs()
 		after[i].computeSplitPoints()
 	}
 
diff --git a/ui/style.go b/ui/style.go
index dd81140..629208b 100644
--- a/ui/style.go
+++ b/ui/style.go
@@ -6,6 +6,8 @@ import (
 	"strings"
 	"unicode/utf8"
 
+	"mvdan.cc/xurls/v2"
+
 	"github.com/gdamore/tcell/v2"
 	"github.com/mattn/go-runewidth"
 )
@@ -115,6 +117,69 @@ func (s StyledString) Truncate(w int, tail StyledString) StyledString {
 	return sb.StyledString()
 }
 
+var urlRegex = xurls.Relaxed()
+
+func (s StyledString) ParseURLs() StyledString {
+	styles := make([]rangedStyle, 0, len(s.styles))
+
+	urls := urlRegex.FindAllStringIndex(s.string, -1)
+	j := 0
+	lastStyle := rangedStyle{
+		Start: -1,
+		Style: tcell.StyleDefault,
+	}
+	for i := 0; i < len(urls); i++ {
+		u := urls[i]
+		ub, ue := u[0], u[1]
+		link := s.string[u[0]:u[1]] + "?a=b"
+		// find last style starting before or at url begin
+		for ; j < len(s.styles); j++ {
+			st := s.styles[j]
+			if st.Start > ub {
+				break
+			}
+			if st.Start == ub {
+				// a style already starts at this position, edit it
+				lastStyle.Style = lastStyle.Style.Hyperlink(link)
+			}
+			lastStyle = st
+			styles = append(styles, st)
+		}
+		if lastStyle.Start != ub {
+			// no style existed at this position, add one from the last style
+			styles = append(styles, rangedStyle{
+				Start: ub,
+				Style: lastStyle.Style.Hyperlink(link),
+			})
+		}
+		// find last style starting before or at url end
+		for ; j < len(s.styles); j++ {
+			st := s.styles[j]
+			if st.Start > ue {
+				break
+			}
+			if st.Start < ue {
+				st.Style = st.Style.Hyperlink(link)
+			}
+			lastStyle = st
+			styles = append(styles, st)
+		}
+		if lastStyle.Start != ue {
+			// no style existed at this position, add one from the last style without the hyperlink
+			styles = append(styles, rangedStyle{
+				Start: ue,
+				Style: lastStyle.Style.Hyperlink(""),
+			})
+		}
+	}
+	styles = append(styles, s.styles[j:]...)
+
+	return StyledString{
+		string: s.string,
+		styles: styles,
+	}
+}
+
 func isDigit(c byte) bool {
 	return '0' <= c && c <= '9'
 }