hush: detect when terminating "done"/"fi" is missing

function                                             old     new   delta
parse_stream                                        2271    2292     +21
.rodata                                           105408  105427     +19
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 40/0)               Total: 40 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-parsing/nodone1.right

@@ -0,0 +1 @@
+./nodone1.tests: line 2: syntax error: unexpected end of file (expecting "done")

shell/ash_test/ash-parsing/nodone1.tests

@@ -0,0 +1 @@
+for i; do :

shell/ash_test/ash-parsing/nodone2.right

@@ -0,0 +1 @@
+1

shell/ash_test/ash-parsing/nodone2.tests

@@ -0,0 +1,3 @@
+for i in 1; do echo $i
+# the next line has no EOL. It still must count as "done" keyword:
+done

shell/hush.c

@@ -5497,6 +5497,15 @@ static struct pipe *parse_stream(char **pstring,
 			}
 			o_free_and_set_NULL(&ctx.word);
 			done_pipe(&ctx, PIPE_SEQ);
+
+			/* Do we sit inside of any if's, loops or case's? */
+			if (HAS_KEYWORDS
+			IF_HAS_KEYWORDS(&& (ctx.ctx_res_w != RES_NONE || ctx.old_flag != 0))
+			) {
+				syntax_error_unterm_str("compound statement");
+				goto parse_error_exitcode1;
+			}
+
 			pi = ctx.list_head;
 			/* If we got nothing... */
 			/* (this makes bare "&" cmd a no-op.
@@ -5519,7 +5528,7 @@ static struct pipe *parse_stream(char **pstring,
 			//	*heredoc_cnt_ptr = heredoc_cnt;
 			debug_leave();
 			debug_printf_heredoc("parse_stream return heredoc_cnt:%d\n", heredoc_cnt);
-			debug_printf_parse("parse_stream return %p\n", pi);
+			debug_printf_parse("parse_stream return %p: EOF\n", pi);
 			return pi;
 		}
 

shell/hush_test/hush-parsing/nodone1.right

@@ -0,0 +1 @@
+hush: syntax error: unterminated compound statement

shell/hush_test/hush-parsing/nodone1.tests

@@ -0,0 +1 @@
+for i; do :

shell/hush_test/hush-parsing/nodone2.right

@@ -0,0 +1 @@
+1

shell/hush_test/hush-parsing/nodone2.tests

@@ -0,0 +1,3 @@
+for i in 1; do echo $i
+# the next line has no EOL. It still must count as "done" keyword:
+done