From ff6b298b9dc3cb7a638deb23678f1b8d718f007e Mon Sep 17 00:00:00 2001
From: Thomas Jensen <boxes@thomasjensen.com>
Date: Sun, 17 Dec 2023 21:51:02 +0100
Subject: [PATCH] Fix horizontal line matching in 'remove' module

---
 src/remove.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/src/remove.c b/src/remove.c
index a14fee6b..dde25fe7 100644
--- a/src/remove.c
+++ b/src/remove.c
@@ -531,7 +531,6 @@ static int match_horiz_line(remove_ctx_t *ctx, int hside, size_t input_line_idx,
         shape_line_ctx_t *shapes_relevant = prepare_comp_shapes_horiz(hside, comp_type, shape_line_idx);
         debug_print_shapes_relevant(shapes_relevant);
 
-        uint32_t *cur_pos = NULL;
         bxstr_t *input_prepped1 = bxs_from_unicode(prepare_comp_input(input_line_idx, 0, comp_type, 0, NULL, NULL));
         bxstr_t *input_prepped = bxs_rtrim(input_prepped1);
         bxs_free(input_prepped1);
@@ -540,15 +539,23 @@ static int match_horiz_line(remove_ctx_t *ctx, int hside, size_t input_line_idx,
             fprintf(stderr, "  input_prepped = \"%s\"\n", out_input_prepped);
             BFREE(out_input_prepped);
         #endif
-        match_result_t *mrl = match_outer_shape(BLEF, input_prepped, shapes_relevant[0].text);
-        if (mrl != NULL) {
-            cur_pos = mrl->p + mrl->len;
+
+        uint32_t *cur_pos = input_prepped->memory;
+        match_result_t *mrl = NULL;
+        if (!ctx->empty_side[BLEF]) {
+            mrl = match_outer_shape(BLEF, input_prepped, shapes_relevant[0].text);
+            if (mrl != NULL) {
+                cur_pos = mrl->p + mrl->len;
+            }
         }
 
-        uint32_t *end_pos = NULL;
-        match_result_t *mrr = match_outer_shape(BRIG, input_prepped, shapes_relevant[SHAPES_PER_SIDE - 1].text);
-        if (mrr != NULL) {
-            end_pos = mrr->p;
+        uint32_t *end_pos = bxs_last_char_ptr(input_prepped);
+        match_result_t *mrr = NULL;
+        if (!ctx->empty_side[BRIG]) {
+            mrr = match_outer_shape(BRIG, input_prepped, shapes_relevant[SHAPES_PER_SIDE - 1].text);
+            if (mrr != NULL) {
+                end_pos = mrr->p;
+            }
         }
         #ifdef DEBUG
             char *out_cur_pos = u32_strconv_to_output(cur_pos);
@@ -559,9 +566,8 @@ static int match_horiz_line(remove_ctx_t *ctx, int hside, size_t input_line_idx,
             BFREE(out_end_pos);
         #endif
 
-        if (cur_pos && end_pos) {
-            result = hmm(shapes_relevant, cur_pos, 1, end_pos, mrl->shiftable ? 0 : 1, mrr->shiftable ? 0 : 1);
-        }
+        result = hmm(shapes_relevant, cur_pos, 1, end_pos, (mrl == NULL) || mrl->shiftable ? 0 : 1,
+                (mrr == NULL) || mrr->shiftable ? 0 : 1);
 
         BFREE(mrl);
         BFREE(mrr);