From 06106300e03dabe51f8ba7805984433730de2fe4 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Wed, 17 Jul 2024 16:31:23 -0400
Subject: listbas: add -t (disable indent) option, though indentation not yet
 implemented. also add large commentary section.

---
 listbas.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 4 deletions(-)

diff --git a/listbas.c b/listbas.c
index eed8334..9f27480 100644
--- a/listbas.c
+++ b/listbas.c
@@ -78,6 +78,7 @@ int skip_lineno = 0;  /* 1 with -l */
 int dump_tables = 0;  /* 1 with -D */
 int autodetect  = 1;  /* 0 with -b */
 int mixed_case  = 1;  /* 0 with -k, or if input is B_ATARI or B_APLUS */
+int indent =      1;  /* 0 with -t, or if input is B_ATARI */
 
 /* change these with -c */
 int color_cmd =       C_YELLOW;
@@ -91,9 +92,11 @@ int color_varnames  = NO_COLOR;
 
 const char *input_filename;
 
-int badtok =      0; /* set to 1 if we find a bad token */
-int inv =         0; /* set to 1 when we're printing inverse */
-int cur_color =  -1; /* -1 = no color */
+int indent_level = 0;
+int badtok =       0; /* set to 1 if we find a bad token */
+int inv =          0; /* set to 1 when we're printing inverse */
+int cur_color =   -1; /* -1 = no color */
+
 FILE *outfh;
 
 int parse_color(char c) {
@@ -146,7 +149,7 @@ int get_bas_type(char *arg) {
 }
 
 void print_help(void) {
-	printf("Usage: %s [-a|-d|-m|-x|-U] [-B] [-i] [-l] [-u] [-n|-C] [-v] [-c *colors*] [-k] <inputfile>\n", self);
+	printf("Usage: %s [-a|-d|-m|-x|-U] [-B] [-i] [-l] [-u] [-n|-C] [-v] [-c *colors*] [-k] [-t] <inputfile>\n", self);
 	printf("  -b <XX>: set BASIC type. XX is: a = atari, t = turbo, xl, xe, a+.\n");
 	printf("  -U: output ATASCII as Unicode/UTF-8 (this is the default).\n");
 	printf("  -a: output raw ATASCII.\n");
@@ -161,6 +164,7 @@ void print_help(void) {
 	printf("  -u: use underline for inverse video.\n");
 	printf("  -c: use custom colors (see man page).\n");
 	printf("  -k: disable mixed case keywords for BXL/BXE (e.g. Print).\n");
+	printf("  -t: disable Turbo/BXL/BXE indentation.\n");
 	printf("  -v: verbose.\n");
 }
 
@@ -478,6 +482,47 @@ CALLBACK(print_lineno) {
 	if(color) color_off();
 }
 
+/* indentation is totally different between A+, BXL, and BXE.
+   Turbo and BXE use the same indent style, but Turbo has more
+   keywords that indent (e.g. REPEAT, DO).
+
+   A+ always indents on the lines after a WHILE or a FOR, unless there's
+   a matching ENDWHILE or NEXT on the same line. It indents the lines
+   after IF only if there's no THEN and no matching ENDIF on the
+   same line. ENDWHILE, NEXT, ENDIF all un-undent one level. The style
+   is that the the ending keyword (or ELSE) does NOT get unindented,
+   itself:
+
+   WHILE 1
+     PRINT "OK"
+     ENDWHILE
+   PRINT "HEY"
+
+   That looks *wrong* to me (the ENDWHILE should line up with the WHILE), but
+   that's how A+ works.
+
+  BXL's style is to indent the entire block to the same level:
+
+     While 1
+     Print "OK"
+     Endwhile
+   Print "HEY"
+
+   This applies even if the whole block's on one line:
+
+    ? "OK"
+      For I=1 To 10:Next I
+    ? "OK"
+
+BXE and Turbo work like modern style: the keywords that start and end the
+block are not indented, only the lines between them.
+
+   While 1
+     Print "OK"
+   Endwhile
+   Print "HEY"
+
+ */
 CALLBACK(print_cmd) {
 	const char *name;
 
@@ -845,6 +890,9 @@ void init_bas_dialect() {
 
 	if(bas_type == B_ATARI || bas_type == B_APLUS || bas_type == B_TURBO)
 		mixed_case = 0;
+
+	if(bas_type == B_ATARI)
+		indent = 0;
 }
 
 int main(int argc, char **argv) {
-- 
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