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mutt: add H keybinding to view HTML emails in browser
Converts embedded images to base64 data URIs so they display correctly.
author
lassulus
date
(Jan 18, 2026, 3:48 PM CET)
commit
42e06148
42e06148684c6cb4c63e84e373ecd0a45bf956d4
parent
6400db8b
6400db8b6664f1aa301e5d17100db1c8994a0e92
+45
+45
tools/mutt/flake-module.nix
+45
tools/mutt/flake-module.nix
···
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text/html; ${pkgs.elinks}/bin/elinks -dump ; copiousoutput;
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'';
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# Script to view HTML emails in browser with embedded images
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viewHtmlBrowser = pkgs.writeShellScriptBin "view-html-browser" ''
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set -euo pipefail
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tmpfile=$(mktemp --suffix=.html)
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trap 'rm -f "$tmpfile"' EXIT
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${pkgs.python3}/bin/python3 -c '
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import email, sys, base64
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msg = email.message_from_file(sys.stdin)
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# Build map of Content-ID -> base64 data URI
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cid_map = {}
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for part in msg.walk():
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cid = part.get("Content-ID", "").strip("<>")
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if cid and part.get_content_maintype() == "image":
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data = part.get_payload(decode=True)
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if data:
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mime = part.get_content_type()
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cid_map[cid] = f"data:{mime};base64,{base64.b64encode(data).decode()}"
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# Find HTML part
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html = None
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for part in msg.walk():
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if part.get_content_type() == "text/html":
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payload = part.get_payload(decode=True)
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charset = part.get_content_charset() or "utf-8"
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html = payload.decode(charset, errors="replace")
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break
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if html:
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for cid, data_uri in cid_map.items():
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html = html.replace(f"cid:{cid}", data_uri)
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print(html)
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else:
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print("<html><body><p>No HTML content found.</p></body></html>")
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' > "$tmpfile"
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${if pkgs.stdenv.isDarwin then "open" else "xdg-open"} "$tmpfile"
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sleep 2
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'';
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msmtprc = pkgs.writeText "msmtprc" ''
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defaults
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logfile ~/.msmtp.log
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# scan urls from emails
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macro index,pager \cb "<pipe-message> ${lib.getExe pkgs.urlscan}<Enter>"
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macro attach,compose \cb "<pipe-entry> ${lib.getExe pkgs.urlscan}<Enter>"
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# view HTML in graphical browser
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macro index,pager H "<pipe-message>${viewHtmlBrowser}/bin/view-html-browser<Enter>" "View HTML in browser"
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# sidebar
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set sidebar_divider_char = '│'