From 057829e5a7c99e6fe2ae933cc963c4664674315f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Mon, 30 Oct 2023 21:36:28 +0100
Subject: Highlight quotation marks depending on depth.

---
 mu4web/main.py          | 12 +++++++++++-
 mu4web/static/style.css | 10 ++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/mu4web/main.py b/mu4web/main.py
index 59f14c7..bbe58cb 100644
--- a/mu4web/main.py
+++ b/mu4web/main.py
@@ -505,7 +505,17 @@ def response_for(id: str, mail: EmailMessage) -> str:
                                     'height': '300',
                                     }))
         elif at.get_content_type() == 'text/plain':
-            body.append(('pre', at.get_content()))
+            items: list[HTML] = []
+            for line in at.get_content().split('\n'):
+                if m := re.match(r'^((> *)+)', line):
+                    for depth, str in enumerate(re.findall('> *', m[1])):
+                        items.append(('span', {'class': f'quote-marker quote-{depth % 5}'}, str))
+                    items.append(line[m.end():])
+                    items.append("\n")
+                else:
+                    items.append(line)
+                    items.append("\n")
+            body.append(('pre', items))
         elif at.get_content_type() == 'application/octet-stream':
             url = '/part?' + urlencode({'id': id, 'idx': idx})
             body.append(('a', {'href': url,
diff --git a/mu4web/static/style.css b/mu4web/static/style.css
index 75d4a28..0cba3af 100644
--- a/mu4web/static/style.css
+++ b/mu4web/static/style.css
@@ -135,3 +135,13 @@ table a {
 	display: inline-block;
 	max-width: calc(100vw/4);
 }
+
+.quote-marker {
+	font-weight: bold;
+}
+
+.quote-0 { color: darkcyan; }
+.quote-1 { color: magenta; }
+.quote-2 { color: goldenrod; }
+.quote-3 { color: #00cc00; }
+.quote-4 { color: red; }
-- 
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