From af668004e85e99858df4a025af82c4602e0ab399 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Mon, 2 May 2022 17:25:18 -0400
Subject: [PATCH] Updated Make rules so default is `bp`

---
 Makefile  |  8 ++++----
 match.c   | 20 +++++++++++++++++++-
 pattern.c |  3 +++
 pattern.h | 17 +++++++++--------
 4 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index fa0131b..2afb00d 100644
--- a/Makefile
+++ b/Makefile
@@ -25,14 +25,14 @@ ALL_FLAGS=$(CFLAGS) $(OSFLAGS) -DBP_NAME="\"$(NAME)\"" $(EXTRA) $(CWARN) $(G) $(
 CFILES=pattern.c utils.c match.c files.c printmatch.c json.c utf8.c
 OBJFILES=$(CFILES:.c=.o)
 
+$(NAME): $(OBJFILES) bp.c
+	$(CC) $(ALL_FLAGS) -o $@ $(OBJFILES) bp.c
+
 all: $(NAME) bp.1 lua
 
 %.o: %.c %.h utf8.h
 	$(CC) -c $(ALL_FLAGS) -o $@ $<
 
-$(NAME): $(OBJFILES) bp.c
-	$(CC) $(ALL_FLAGS) -o $@ $(OBJFILES) bp.c
-
 bp.1: bp.1.md
 	pandoc --lua-filter=.pandoc/bold-code.lua -s $< -t man -o $@
 
@@ -43,7 +43,7 @@ clean:
 	rm -f $(NAME) $(OBJFILES)
 
 lua:
-	cd Lua && make
+	@cd Lua && make
 
 test: $(NAME)
 	./$(NAME) Comment -r '[@0]' >/dev/null
diff --git a/match.c b/match.c
index 8231fc0..474bd85 100644
--- a/match.c
+++ b/match.c
@@ -565,7 +565,22 @@ static match_t *match(match_ctx_t *ctx, const char *str, pat_t *pat)
         if (m1->pat->type == BP_CAPTURE && m1->pat->args.capture.name) {
             // Temporarily add a rule that the backref name matches the
             // exact string of the original match (no replacements)
-            pat_t *backref = bp_raw_literal(m1->start, (size_t)(m1->end - m1->start));
+            pat_t *backref;
+            if (m1->children && m1->children[0]->pat->type == BP_CURDENT) {
+                const char *linestart = m1->start;
+                while (linestart > ctx->start && linestart[-1] != '\n') --linestart;
+
+                // Current indentation:
+                char denter = *linestart;
+                size_t dents = 0;
+                if (denter == ' ' || denter == '\t') {
+                    while (linestart[dents] == denter && &linestart[dents] < ctx->end)
+                        ++dents;
+                }
+                backref = bp_raw_literal(linestart, dents);
+            } else {
+                backref = bp_raw_literal(m1->start, (size_t)(m1->end - m1->start));
+            }
             match_ctx_t ctx2 = *ctx;
             ctx2.cache = &(cache_t){0};
             ctx2.parent_ctx = ctx;
@@ -711,6 +726,9 @@ static match_t *match(match_ctx_t *ctx, const char *str, pat_t *pat)
 
         return new_match(pat, start, &str[dents], NULL);
     }
+    case BP_CURDENT: {
+        return new_match(pat, str, str, NULL);
+    }
     default: {
         errx(EXIT_FAILURE, "Unknown pattern type: %u", pat->type);
         return NULL;
diff --git a/pattern.c b/pattern.c
index d0e364f..83ff0a1 100644
--- a/pattern.c
+++ b/pattern.c
@@ -320,6 +320,9 @@ static pat_t *_bp_simplepattern(const char *str, const char *end, bool inside_st
             if (*str == 'N') { // \N (nodent)
                 all = either_pat(all, new_pat(BP_NODENT, itemstart, ++str, 1, -1));
                 continue;
+            } else if (*str == 'C') { // \C (current indent)
+                all = either_pat(all, new_pat(BP_CURDENT, itemstart, ++str, 1, -1));
+                continue;
             } else if (*str == 'i') { // \i (identifier char)
                 all = either_pat(all, new_pat(BP_ID_CONTINUE, itemstart, ++str, 1, -1));
                 continue;
diff --git a/pattern.h b/pattern.h
index 8dc40d2..89d57b8 100644
--- a/pattern.h
+++ b/pattern.h
@@ -29,14 +29,15 @@ enum pattype_e {
     BP_REPLACE       = 17,
     BP_REF           = 18,
     BP_NODENT        = 19,
-    BP_START_OF_FILE = 20,
-    BP_START_OF_LINE = 21,
-    BP_END_OF_FILE   = 22,
-    BP_END_OF_LINE   = 23,
-    BP_WORD_BOUNDARY = 24,
-    BP_DEFINITIONS   = 25,
-    BP_TAGGED        = 26,
-    BP_LEFTRECURSION = 27,
+    BP_CURDENT       = 20,
+    BP_START_OF_FILE = 21,
+    BP_START_OF_LINE = 22,
+    BP_END_OF_FILE   = 23,
+    BP_END_OF_LINE   = 24,
+    BP_WORD_BOUNDARY = 25,
+    BP_DEFINITIONS   = 26,
+    BP_TAGGED        = 27,
+    BP_LEFTRECURSION = 28,
 };
 
 //