. "$BST_LIB"
require indent indent/present

tmp=${TMPDIR:-/tmp}/bst-indent.$$
in="$tmp.c"; gnu="$tmp.gnu.c"; kr="$tmp.kr.c"

# one-line input the formatter must restructure
printf '%s\n' 'int main(void){int x=1;if(x){return 0;}return 1;}' > "$in"

# --version prints the banner then exits nonzero by design ("zero exit values
# are returned only when code has been successfully formatted"), so match the
# banner without requiring rc 0.
v=$(indent --version 2>&1)
case "$v" in
  *"GNU indent"*) bst_ok indent/version ;;
  *) bst_notok indent/version "unexpected: $v" ;;
esac

# GNU style (the default): return type on its own line, space before the parens
check     indent/gnu-run   indent "$in" -o "$gnu"
check_out indent/gnu-style "main (void)" cat "$gnu"
check_out indent/gnu-body  "return 0;" cat "$gnu"

# K&R style: function name stays on the type line, no space before the parens
check     indent/kr-run    indent -kr "$in" -o "$kr"
check_out indent/kr-style  "int main(void)" cat "$kr"

# idempotence: re-indenting already-formatted output is a no-op (cmp = diffutils)
check indent/stable sh -c "indent -st '$gnu' | cmp -s - '$gnu'"

rm -f "$in" "$gnu" "$kr" "$in.BAK" "$gnu.BAK" "$kr.BAK"