Switch the region under Setup > Region, and offer China Apps

omarchy region cn|global switches an installed machine: cn upgrades,
trusts ArchLinuxCN through the rendered China config, records the
marker and links the developer mirrors, then refreshes pacman;
global undoes only what Omarchy made. The developer mirrors reach
new sessions only, so a terminal switch offers to log out.

Install > China Apps, shown only in China, installs WeChat, QQ,
Feishu, DingTalk, Tencent Meeting and WPS Office from the AUR and
sets up Tencent Docs, Yuque and Shimo as web apps.

manual/52-china.md describes the China region.

test/shell.d/region-switch-test.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
+
+test_tmp=$(mktemp -d)
+trap 'rm -rf "$test_tmp"' EXIT
+
+root="$test_tmp/root" sandbox="$test_tmp/omarchy" calls="$test_tmp/calls"
+mkdir -p "$root/etc/pacman.d" "$sandbox/bin" "$sandbox/install/config" "$sandbox/default/regions" "$test_tmp/bin" "$test_tmp/home"
+cp -r "$ROOT/default/regions/cn" "$sandbox/default/regions/"
+rewrite() { sed -e "s|/etc/|$root/etc/|g" -e "s| /\\.cargo/| $root/.cargo/|g" "$1" >"$2"; chmod +x "$2"; }
+rewrite "$ROOT/install/config/region.sh" "$sandbox/install/config/region.sh"
+rewrite "$ROOT/bin/omarchy-region" "$sandbox/bin/omarchy-region"
+
+for command in omarchy-refresh-pacman omarchy-system-logout pacman-key pacman omarchy-apply-pacman; do
+  printf '#!/bin/bash\necho "%s $*" >>"%s"\n' "$command" "$calls" >"$test_tmp/bin/$command"
+done
+printf '#!/bin/bash\necho "omarchy-update-pacman $*" >>"%s"\n[[ -z ${STUB_UPDATE_FAIL:-} ]]\n' "$calls" >"$test_tmp/bin/omarchy-update-pacman"
+printf '#!/bin/bash\necho "${STUB_CHANNEL:-stable}"\n' >"$test_tmp/bin/omarchy-version-channel"
+printf '#!/bin/bash\n[[ $1 == env ]] && shift\nexec env "$@"\n' >"$test_tmp/bin/sudo"
+printf '#!/bin/bash\necho "gum $*" >>"%s"\nexit "${GUM_ANSWER:-1}"\n' "$calls" >"$test_tmp/bin/gum"
+chmod +x "$test_tmp/bin"/*
+mkdir -p "$test_tmp/tmp"
+export PATH="$test_tmp/bin:$sandbox/bin:$PATH" OMARCHY_PATH="$sandbox" HOME="$test_tmp/home" TMPDIR="$test_tmp/tmp"
+switch_calls() { sed "s|$test_tmp/tmp/[^/ ]*|RENDERED|g" "$calls"; }
+
+omarchy-region cn >/dev/null
+[[ $(omarchy-region) == "China" && $(<"$root/etc/omarchy/region") == "cn" ]] ||
+  fail "switching to China records cn"
+[[ $(switch_calls) == $'omarchy-update-pacman -Syu --noconfirm\nomarchy-apply-pacman --render stable RENDERED\npacman --config RENDERED/pacman.conf -Sy --noconfirm --needed archlinuxcn-keyring\npacman-key --populate archlinuxcn\nomarchy-refresh-pacman stable' ]] ||
+  fail "China upgrades, trusts ArchLinuxCN through the rendered cn config, then refreshes" "$(switch_calls)"
+[[ -z $(ls -A "$test_tmp/tmp") ]] || fail "the rendered config is removed"
+pass "switching to China trusts ArchLinuxCN before the refresh upgrades through it"
+
+: >"$calls"
+STUB_CHANNEL=edge omarchy-region cn >/dev/null
+grep -qx 'omarchy-refresh-pacman edge' "$calls" || fail "the refresh keeps the machine's channel" "$(<"$calls")"
+pass "switching to China again keeps the channel"
+
+: >"$calls"
+omarchy-region global >/dev/null
+[[ $(omarchy-region) == "Global" && ! -e $root/etc/omarchy/region ]] ||
+  fail "switching to Global removes the region"
+[[ $(<"$calls") == 'omarchy-refresh-pacman stable' ]] ||
+  fail "Global refreshes pacman back to the channel defaults" "$(<"$calls")"
+pass "switching to Global restores the channel's pacman defaults"
+
+if output=$(omarchy-region mars 2>&1); then
+  fail "an unknown region is refused" "$output"
+fi
+if output=$(STUB_CHANNEL="stable / edge" omarchy-region cn 2>&1); then
+  fail "a mixed channel is refused" "$output"
+fi
+[[ $(omarchy-region) == "Global" ]] || fail "a refused switch changes nothing"
+pass "an unknown region or an unclear channel is refused"
+
+: >"$calls"
+if output=$(STUB_UPDATE_FAIL=1 omarchy-region cn 2>&1); then
+  fail "switching to China fails when the upgrade fails" "$output"
+fi
+[[ $(omarchy-region) == "Global" ]] && ! grep -q '^omarchy-refresh-pacman' "$calls" ||
+  fail "a failed switch to China leaves the region Global and pacman untouched" "$(<"$calls")"
+pass "a failed switch to China leaves the machine Global"
+
+grep -q '^gum' "$calls" && fail "a switch without a terminal asks nothing" "$(<"$calls")"
+: >"$calls"
+output=$(GUM_ANSWER=1 script -qec "omarchy-region cn" /dev/null)
+[[ $output == *"Log back in to switch the developer mirrors."* ]] && ! grep -q '^omarchy-system-logout' "$calls" ||
+  fail "declining the logout leaves a reminder and the session" "$output"
+: >"$calls"
+GUM_ANSWER=0 script -qec "omarchy-region global" /dev/null >/dev/null
+grep -qxF 'gum confirm --affirmative Log out now --negative Later Log out now to switch the developer mirrors?' "$calls" &&
+  grep -qx 'omarchy-system-logout ' "$calls" || fail "a terminal switch offers to log out and logs out on yes" "$(<"$calls")"
+pass "a switch in a terminal offers to log out"