Read the default browser from mimeapps.list when launching (#13520)

* Read the default browser from mimeapps.list when launching

omarchy-launch-browser and omarchy-launch-webapp asked xdg-settings for the
default browser on every launch, ~72ms through several POSIX shell scripts.
The new omarchy-cmd-default-browser reads the http handler from the
config-dir mimeapps.list files the way xdg-mime does, desktop-specific list
first, taking the first listed entry whose command is installed, in ~10ms.
With nothing set there it falls back to xdg-settings as before.

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

* Let the first copy of a browser entry decide whether it is installed

A user-local entry whose browser is gone could be rescued by a system copy
of the same ID, which the launchers never read. xdg-mime judges the first
copy found, as the launchers use it, so do the same.

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

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

bin/omarchy-cmd-default-browser

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+# omarchy:summary=Print the desktop entry ID of the default web browser
+# omarchy:hidden=true
+
+# Read the http handler from the config-dir mimeapps.list files the way xdg-mime
+# does, desktop-specific list first, taking the first listed entry that is
+# installed. xdg-settings reaches the same answer through several shell scripts
+# in ~70ms, which every browser and web app launch would otherwise pay.
+IFS=: read -ra data_dirs <<<"${XDG_DATA_HOME:-$HOME/.local/share}:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+IFS=: read -ra config_dirs <<<"${XDG_CONFIG_HOME:-$HOME/.config}:${XDG_CONFIG_DIRS:-/etc/xdg}"
+IFS=: read -ra desktops <<<"${XDG_CURRENT_DESKTOP:-}"
+
+# Installed means the command of the entry the launchers will read, the first
+# one found, still resolves: an entry of Omarchy's own can outlive the browser
+# it launched.
+installed() {
+  local data_dir command
+
+  for data_dir in "${data_dirs[@]}"; do
+    [[ -r $data_dir/applications/$1 ]] || continue
+    command=$(sed -n 's/^Exec=\([^ ]*\).*/\1/p' "$data_dir/applications/$1" | head -1)
+    [[ -n $command ]] && command -v "$command" >/dev/null
+    return
+  done
+
+  return 1
+}
+
+for config_dir in "${config_dirs[@]}"; do
+  for desktop in "${desktops[@]}" ""; do
+    list="$config_dir/${desktop:+${desktop,,}-}mimeapps.list"
+    [[ -f $list ]] || continue
+
+    entries=$(awk '
+      /^\[Default Applications\]/ { section = 1; next }
+      /^\[/ { section = 0 }
+      section && index($0, "x-scheme-handler/http=") == 1 { print substr($0, 23); exit }
+    ' "$list")
+
+    IFS=';' read -ra entries <<<"$entries"
+    for entry in "${entries[@]}"; do
+      if [[ -n $entry ]] && installed "$entry"; then
+        echo "$entry"
+        exit 0
+      fi
+    done
+  done
+done
+
+# Nothing set in a config dir: let xdg-settings search the data dirs and caches.
+# It consults $BROWSER too, which the session points back at omarchy-launch-browser.
+browser=$(env -u BROWSER xdg-settings get default-web-browser 2>/dev/null)
+if [[ -z $browser ]]; then
+  browser=$(xdg-mime query default x-scheme-handler/https 2>/dev/null)
+fi
+
+[[ -n $browser ]] && echo "$browser"

bin/omarchy-launch-browser

@@ -3,10 +3,7 @@
 # omarchy:summary=Launch the default browser as determined by xdg-settings.
 # omarchy:args=[url]
 
-default_browser=$(env -u BROWSER xdg-settings get default-web-browser)
-if [[ -z $default_browser ]]; then
-  default_browser=$(xdg-mime query default x-scheme-handler/https)
-fi
+default_browser=$(omarchy-cmd-default-browser)
 browser_exec=$(sed -n 's/^Exec=\([^ ]*\).*/\1/p' {~/.local,~/.nix-profile,/usr}/share/applications/$default_browser 2>/dev/null | head -1)
 
 if $browser_exec --help 2>/dev/null | grep -q MOZ_LOG; then

bin/omarchy-launch-webapp

@@ -3,9 +3,7 @@
 # omarchy:summary=Launch a URL as a web app in the default supported browser
 # omarchy:args=<url>
 
-# The session sets BROWSER to omarchy-launch-browser, which sends xdg-settings
-# down a slower path (~100ms against ~30ms) to the same answer.
-browser=$(env -u BROWSER xdg-settings get default-web-browser)
+browser=$(omarchy-cmd-default-browser)
 
 case $browser in
 google-chrome* | brave* | microsoft-edge* | opera* | vivaldi* | helium*) ;;

test/shell.d/default-browser-lookup-test.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+mock_bin="$test_tmp/bin"
+mkdir -p "$mock_bin" "$test_tmp/config" "$test_tmp/data/applications" "$test_tmp/system/applications"
+
+export HOME="$test_tmp/home"
+export XDG_CONFIG_HOME="$test_tmp/config"
+export XDG_CONFIG_DIRS="$test_tmp/etc"
+export XDG_DATA_HOME="$test_tmp/data"
+export XDG_DATA_DIRS="$test_tmp/system"
+export XDG_CURRENT_DESKTOP=Hyprland
+export BROWSER=omarchy-launch-browser
+export OMARCHY_TEST_XDG_SETTINGS_LOG="$test_tmp/xdg-settings"
+
+cat >"$mock_bin/xdg-settings" <<'SH'
+#!/bin/bash
+printf '%s\n' "${BROWSER:-unset}" >"$OMARCHY_TEST_XDG_SETTINGS_LOG"
+echo fallback.desktop
+SH
+export PATH="$mock_bin:$ROOT/bin:$PATH"
+
+for browser in chromium firefox brave; do
+  printf '#!/bin/bash\n' >"$mock_bin/$browser"
+done
+chmod +x "$mock_bin"/*
+
+echo "Exec=chromium %U" >"$XDG_DATA_HOME/applications/chromium.desktop"
+echo "Exec=firefox %u" >"$XDG_DATA_HOME/applications/firefox.desktop"
+echo "Exec=brave %U" >"$XDG_DATA_DIRS/applications/brave-browser.desktop"
+# An entry of Omarchy's own left behind by a browser since removed, shadowing
+# a system copy that the launchers would never read.
+echo "Exec=removed-browser %U" >"$XDG_DATA_HOME/applications/removed.desktop"
+echo "Exec=brave %U" >"$XDG_DATA_DIRS/applications/removed.desktop"
+
+cat >"$XDG_CONFIG_HOME/mimeapps.list" <<'EOF'
+[Added Associations]
+x-scheme-handler/http=firefox.desktop;
+
+[Default Applications]
+text/html=firefox.desktop
+x-scheme-handler/http=missing.desktop;removed.desktop;chromium.desktop;
+EOF
+
+[[ $(omarchy-cmd-default-browser) == "chromium.desktop" ]] ||
+  fail "default browser is the first installed http handler in mimeapps.list"
+[[ ! -e $OMARCHY_TEST_XDG_SETTINGS_LOG ]] ||
+  fail "default browser skips xdg-settings when mimeapps.list names one"
+
+cat >"$XDG_CONFIG_HOME/hyprland-mimeapps.list" <<'EOF'
+[Default Applications]
+x-scheme-handler/http=brave-browser.desktop
+EOF
+
+[[ $(omarchy-cmd-default-browser) == "brave-browser.desktop" ]] ||
+  fail "default browser prefers the desktop-specific mimeapps.list"
+
+rm "$XDG_CONFIG_HOME/hyprland-mimeapps.list"
+printf '[Default Applications]\nx-scheme-handler/http=missing.desktop\n' >"$XDG_CONFIG_HOME/mimeapps.list"
+
+[[ $(omarchy-cmd-default-browser) == "fallback.desktop" ]] ||
+  fail "default browser falls back to xdg-settings when no listed handler is installed"
+[[ $(<"$OMARCHY_TEST_XDG_SETTINGS_LOG") == "unset" ]] ||
+  fail "default browser unsets BROWSER before asking xdg-settings"
+
+pass "default browser reads mimeapps.list and falls back to xdg-settings"