feat(palette): theme btop, Joplin and Feishin

btop gets a generated udt.theme and only the color_theme line of btop.conf
is rewritten. Joplin gets userchrome.css overriding the --joplin-* custom
properties most of its UI is built on, with !important since Joplin's own
:root block is injected later; a userchrome.css udt did not write is left
alone. Feishin 1.17 watches a Themes folder for JSON themes, so UDT.json
extends its built-in Catppuccin Mocha with the scheme's roles and reaches
a running Feishin live once selected.

All three use existing roles, so no scheme file changes. udt-appthemes
installs them next to Obsidian and Typora; the recap hint names btop and
Joplin among the apps that need a restart.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 66 insertions, 1 deletions

diff --git a/bin/udt-appthemes b/bin/udt-appthemes
index 37d3e63..5504427 100755
--- a/bin/udt-appthemes
+++ b/bin/udt-appthemes
@@ -2,7 +2,8 @@
 # udt-appthemes: install the generated app themes that need more than a copy.
 # Copyright (C) 2026 Danilo M. <danix@danix.xyz>
 # Licensed under the GNU General Public License v2 only.
-"""Install the Obsidian snippet into every vault, and the Typora theme.
+"""Install the app themes that need more than a copy: Obsidian, Typora,
+btop, Joplin and Feishin.
 
 Separate from install.sh because enabling an Obsidian snippet means editing
 JSON that the user also owns: appearance.json lists every enabled snippet, so
@@ -19,6 +20,9 @@ REPO = Path(__file__).resolve().parent.parent
 SNIPPET = "udt"
 OBSIDIAN_REGISTRY = Path.home() / ".config" / "obsidian" / "obsidian.json"
 TYPORA_THEMES = Path.home() / ".config" / "Typora" / "themes"
+BTOP = Path.home() / ".config" / "btop"
+JOPLIN = Path.home() / ".config" / "joplin-desktop"
+FEISHIN = Path.home() / ".config" / "feishin"
 
 
 def vaults():
@@ -80,6 +84,54 @@ def install_typora(source):
     return True
 
 
+def install_btop(source):
+    """Install the theme and point btop.conf's color_theme at it.
+
+    Only that one line is rewritten: btop.conf is btop's own, and it writes
+    the file back on exit, so a btop left running across a scheme switch
+    restores its old color_theme. Restart it after installing.
+    """
+    if not BTOP.is_dir():
+        return False
+    (BTOP / "themes").mkdir(exist_ok=True)
+    shutil.copyfile(source, BTOP / "themes" / "udt.theme")
+    conf = BTOP / "btop.conf"
+    try:
+        lines = conf.read_text().splitlines()
+    except OSError:
+        lines = []
+    want = 'color_theme = "udt"'
+    lines = [want if line.startswith("color_theme") else line for line in lines]
+    if want not in lines:
+        lines.append(want)
+    conf.write_text("\n".join(lines) + "\n")
+    return True
+
+
+def install_joplin(source):
+    """Write userchrome.css, unless the user already keeps their own there.
+
+    Joplin has one userchrome.css per profile and no include, so a file this
+    script did not write is left alone rather than replaced.
+    """
+    if not JOPLIN.is_dir():
+        return None
+    dest = JOPLIN / "userchrome.css"
+    if dest.exists() and "Generated by udt-palette" not in dest.read_text():
+        return False
+    shutil.copyfile(source, dest)
+    return True
+
+
+def install_feishin(source):
+    """Drop the theme into Feishin's Themes folder, which it watches live."""
+    if not FEISHIN.is_dir():
+        return False
+    (FEISHIN / "Themes").mkdir(exist_ok=True)
+    shutil.copyfile(source, FEISHIN / "Themes" / "UDT.json")
+    return True
+
+
 def main():
     obsidian = REPO / "templates" / "obsidian" / "udt.css"
     typora = REPO / "templates" / "typora" / "udt.css"
@@ -95,6 +147,19 @@ def main():
     if install_typora(typora):
         print("typora: udt.css installed (select it in Themes)")
 
+    templates = REPO / "templates"
+    if install_btop(templates / "btop" / "udt.theme"):
+        print("btop: udt theme set (restart btop)")
+
+    joplin = install_joplin(templates / "joplin" / "userchrome.css")
+    if joplin:
+        print("joplin: userchrome.css installed (restart Joplin)")
+    elif joplin is False:
+        print("joplin: userchrome.css is your own, left alone")
+
+    if install_feishin(templates / "feishin" / "UDT.json"):
+        print("feishin: UDT theme installed (select it once in Settings, it then follows live)")
+
     return 0