Add some tests.

regress/cmd-invoke-expand.sh

@@ -0,0 +1,75 @@
+#!/bin/sh
+
+# Invoke-time expansion and conditionals.
+#
+# The parser builds syntax only; environment/tilde expansion, assignments and
+# %if/%elif/%else are all evaluated when the tree is invoked. This drives every
+# one of those through a single config and checks the resulting option values:
+#   - FOO=bar assignments set the environment, read back with ${FOO} and $FOO
+#   - %hidden assignments behave the same
+#   - ~ expands to the home directory
+#   - %if / %elif / %else selects the correct branch
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest -f/dev/null"
+$TMUX kill-server 2>/dev/null
+
+CONF=$(mktemp)
+trap "rm -f $CONF" 0 1 15
+
+cat <<'EOF' >$CONF
+FOO=hello
+set -g @assign "${FOO}"
+set -g @dollar "$FOO"
+%hidden BAR=secret
+set -g @hidden "${BAR}"
+set -g @undef "x${NOSUCHVAR_ZZZ}y"
+set -g @tilde ~
+set -g @baduser ~nosuchuser_zzz9
+%if 1
+set -g @iftrue then
+%else
+set -g @iftrue else
+%endif
+%if 0
+set -g @iffalse then
+%else
+set -g @iffalse else
+%endif
+%if 0
+set -g @elif a
+%elif 1
+set -g @elif b
+%else
+set -g @elif c
+%endif
+EOF
+
+$TMUX -f/dev/null start \; new-session -d 2>/dev/null || exit 1
+$TMUX source-file $CONF || exit 1
+
+check() {
+	got=$($TMUX show -gv "$1")
+	[ "$got" = "$2" ] || { echo "$1: got [$got] expected [$2]" >&2; exit 1; }
+}
+check @assign hello
+check @dollar hello
+check @hidden secret
+check @undef xy			# undefined environment variable expands to nothing
+check @baduser ""		# unknown user in ~user expands to nothing
+check @iftrue then
+check @iffalse else
+check @elif b
+
+# ~ expands to an absolute home directory (value is machine dependent).
+tilde=$($TMUX show -gv @tilde)
+case "$tilde" in
+/*) ;;
+*) echo "@tilde did not expand to an absolute path: [$tilde]" >&2; exit 1;;
+esac
+
+$TMUX kill-server 2>/dev/null
+exit 0