From 2be19b1b6e31451e7ac56fd80d60b6eb02c6c6c1 Mon Sep 17 00:00:00 2001
From: Philipp Winter <phw@nymity.ch>
Date: Sat, 25 May 2024 08:48:25 -0500
Subject: [PATCH] Add support for net4people links.

We're going to use the `net4people_url` BibTeX key to link to a paper's
net4people discussion.  BibTeX parsers don't know about this key and
should therefore ignore it.
---
 assets/discussion-icon.svg |  1 +
 src/html.go                | 26 +++++++++++++++++++++-----
 2 files changed, 22 insertions(+), 5 deletions(-)
 create mode 100644 assets/discussion-icon.svg

diff --git a/assets/discussion-icon.svg b/assets/discussion-icon.svg
new file mode 100644
index 0000000..62bdd3a
--- /dev/null
+++ b/assets/discussion-icon.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><!--!Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free Copyright 2024 Fonticons, Inc.--><path d="M208 352c114.9 0 208-78.8 208-176S322.9 0 208 0S0 78.8 0 176c0 38.6 14.7 74.3 39.6 103.4c-3.5 9.4-8.7 17.7-14.2 24.7c-4.8 6.2-9.7 11-13.3 14.3c-1.8 1.6-3.3 2.9-4.3 3.7c-.5 .4-.9 .7-1.1 .8l-.2 .2 0 0 0 0C1 327.2-1.4 334.4 .8 340.9S9.1 352 16 352c21.8 0 43.8-5.6 62.1-12.5c9.2-3.5 17.8-7.4 25.3-11.4C134.1 343.3 169.8 352 208 352zM448 176c0 112.3-99.1 196.9-216.5 207C255.8 457.4 336.4 512 432 512c38.2 0 73.9-8.7 104.7-23.9c7.5 4 16 7.9 25.2 11.4c18.3 6.9 40.3 12.5 62.1 12.5c6.9 0 13.1-4.5 15.2-11.1c2.1-6.6-.2-13.8-5.8-17.9l0 0 0 0-.2-.2c-.2-.2-.6-.4-1.1-.8c-1-.8-2.5-2-4.3-3.7c-3.6-3.3-8.5-8.1-13.3-14.3c-5.5-7-10.7-15.4-14.2-24.7c24.9-29 39.6-64.7 39.6-103.4c0-92.8-84.9-168.9-192.6-175.5c.4 5.1 .6 10.3 .6 15.5z"/></svg>
\ No newline at end of file
diff --git a/src/html.go b/src/html.go
index 623d484..ed6e581 100644
--- a/src/html.go
+++ b/src/html.go
@@ -68,8 +68,24 @@ func makeBibEntryTitle(entry *bibEntry) string {
 		`</span>`,
 	}
 	// Icons are on the right side.
-	icons := []string{
-		`<span class="icons">`,
+	icons := makeIcons(entry)
+	return strings.Join(append(title, icons...), "\n")
+}
+
+func makeIcons(entry *bibEntry) []string {
+	var icons = []string{`<span class="icons">`}
+
+	// Not all references have a corresponding net4people discussion but if they
+	// do, add an icon.
+	if field, ok := entry.Fields["net4people_url"]; ok {
+		s := fmt.Sprintf("<a href='%s'>", field.String()) +
+			`<img class="icon" title="net4people discussion" src="assets/discussion-icon.svg" alt="Discussion icon">` +
+			`</a>`
+		icons = append(icons, s)
+	}
+
+	// Add icons that are always present.
+	icons = append(icons, []string{
 		fmt.Sprintf("<a href='%s'>", entry.Fields["url"].String()),
 		`<img class="icon" title="Download paper" src="assets/pdf-icon.svg" alt="Download icon">`,
 		`</a>`,
@@ -82,9 +98,9 @@ func makeBibEntryTitle(entry *bibEntry) string {
 		fmt.Sprintf("<a href='#%s'>", entry.CiteName),
 		`<img class="icon" title="Link to paper" src="assets/link-icon.svg" alt="Paper link icon">`,
 		`</a>`,
-		`</span>`,
-	}
-	return strings.Join(append(title, icons...), "\n")
+	}...)
+
+	return append(icons, `</span>`)
 }
 
 func makeBibEntryAuthors(entry *bibEntry) string {