From d723f8a5d54f098f0cf378e5dcf3a7d4ec049822 Mon Sep 17 00:00:00 2001
From: WormHeamer
Date: Wed, 31 Dec 2025 05:01:16 -0500
Subject: add regex search (only forwards for now)

---
 main.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 118 insertions(+), 15 deletions(-)

(limited to 'main.c')

diff --git a/main.c b/main.c
index db6d641..70a25a6 100644
--- a/main.c
+++ b/main.c
@@ -22,6 +22,7 @@
 #include "utf8.h"
 #include "str.h"
 #include "freelist.h"
+#include "regex.h"
 
 #define ED_BUF_MAX 1024
 
@@ -52,6 +53,8 @@ typedef struct {
 	Txt *txt_free;
 	EditMode mode;
 	u32 count;
+	Str input_line, input_prompt;
+	Str last_search;
 } Editor;
 
 Editor e = { 0 };
@@ -433,13 +436,16 @@ void draw(void *ctx) {
 
 	ASSERT(start.i <= eb->txt->ptbl.v[start.p].n);
 	if (!cur_found) vui_curs_pos(x, y);
-	/*
-	u32 c = txt_chr(l);
-	vui_printf(-1, -4, "%u", e.count);
-	vui_aprintf(-1, -3, e.mode ? FG_BCYAN : FG_CYAN, "%s", e.mode ? "INSERT" : "NORMAL");
-	vui_printf(-1, -1, "%u - %u.%u - %02x (%c)", txt_ofs(eb->cur), l.p, l.i, c, (c < 0x20 || c > 0x7e) ? ' ' : c);
-	u32 used = e.scratch.beg - e.scratch.start, max = e.scratch.end - e.scratch.start;
-	vui_printf(-1, -2, "e.scratch %.02f/%.02fk", used/1024.0, max/1024.0);*/
+
+	if (e.input_line.n > 0 || e.input_prompt.n > 0) {
+		u32 x = 0;
+		x += vui_putsn(0, 0, e.input_prompt.s, e.input_prompt.n);
+		x += vui_putsn(x, 0, e.input_line.s, e.input_line.n);
+		vui_curs_pos(x, 0);
+		vui_curs_shape(VUI_CURS_BAR);
+		u32 c = COLS;
+		while (x < c) vui_chr(x++, 0, ' ');
+	}
 }
 
 TxtLoc logical_line_start(TxtLoc l) {
@@ -448,7 +454,77 @@ TxtLoc logical_line_start(TxtLoc l) {
 	return l;
 }
 
+Str get_input_line(Str prompt) {
+	e.input_prompt = prompt;
+	DYNARR(char) s = { 0 };
+	for (;;) {
+		draw(NULL);
+		vui_blit();
+		u32 c = vui_key();
+		switch (c) {
+		case '\r':
+			goto done;
+		case KEY_ESC:
+			e.input_line = (Str) { 0, 0 };
+			e.input_prompt = (Str) { 0, 0 };
+			return (Str) { 0, 0 };
+		case KEY_BKSP:
+			if (s.n > 0) s.n--;
+			break;
+		case 0x17 /* ^W */:
+			while (s.n > 0 && is_space(s.v[s.n-1])) s.n--;
+			while (s.n > 0 && !is_space(s.v[s.n-1])) s.n--;
+			break;
+		default:
+			if (c > 0 && c <= KEY_UTF8_MAX && c >= ' ') {
+				u32 n = utf8_encode_len(&c, 1);
+				DA_AFIT(&s, &e.scratch, s.n + n);
+				utf8_encode(&s.v[s.n], &c, n);
+				s.n += n;
+			}
+			break;
+		}
+		e.input_line = (Str) { s.v, s.n };
+	}
+done:;
+	e.input_line = (Str) { 0, 0 };
+	e.input_prompt = (Str) { 0, 0 };
+	return (Str) { s.v, s.n };
+}
+
+int search_next_regex(TxtLoc l, Str src, TxtLoc *out) {
+	RegEx re = { 0 };
+	ReSearch s = { 0 };
+	if (re_comp_ex(&re, src, &e.scratch, &e.scratch, RE_COMP_NO_GROUPS)) {
+		/* TODO: report parse error */
+		return 0;
+	}
+	TxtLoc t = l;
+	int match_found = 0;
+search_from_start:
+	re_search_start(&s, &re, &e.scratch);
+	while (!at_end(t)) {
+		TxtLoc p = t;
+		Str chnk = txt_next_chunk(&t);
+		re_search_chunk(&s, chnk.s, chnk.n);
+		if (at_end(t)) re_search_last_chunk(&s);
+		ReMatch m;
+		if (re_search_match(&s, &m)) {
+			*out = (TxtLoc) { p.t, p.p, p.i + m.extent.start };
+			return 1;
+		}
+	}
+	if (match_found == 0) {
+		match_found = -1;
+		t = txt_start(t.t);
+		goto search_from_start;
+	}
+	return 0;
+}
+
 int motion(TxtLoc *lp, u32 c) {
+	static Str last_search = { 0 };
+
 	TxtLoc l = *lp;
 	TxtLoc last_loc = l;
 	for (;;) {
@@ -472,6 +548,7 @@ int motion(TxtLoc *lp, u32 c) {
 
 loop:
 	switch (c) {
+
 	case KEY_LEFT:
 	case 'h':
 		l = cprev(l);
@@ -480,6 +557,15 @@ loop:
 	case 'l':
 		l = cnext(l);
 		break;
+	case KEY_DOWN:
+	case 'j':
+		l = next_line(l);
+		break;
+	case KEY_UP:
+	case 'k':
+		l = prev_line(l);
+		break;
+
 	case KEY_LEFT | KEY_CTRL_BIT:
 	case 'b':
 		l = prev_word(l);
@@ -488,14 +574,7 @@ loop:
 	case 'w':
 		l = next_word(l);
 		break;
-	case KEY_UP:
-	case 'k':
-		l = prev_line(l);
-		break;
-	case KEY_DOWN:
-	case 'j':
-		l = next_line(l);
-		break;
+
 	case KEY_UP | KEY_CTRL_BIT:
 	case '{':
 		l = prev_par(l);
@@ -513,6 +592,7 @@ loop:
 	case '%':
 		if (!match_bracket(l, &l)) return 0;
 		break;
+
 	case KEY_PGUP:
 		for (u32 i = 0; i < LINES; i += 3) l = prev_line(l);
 		break;
@@ -530,6 +610,7 @@ loop:
 	case '$':
 		l = end_of_line(l);
 		break;
+
 	case KEY_HOME | KEY_CTRL_BIT:
 	case 'g':
 		if (e.count) {
@@ -548,6 +629,7 @@ loop:
 			l = txt_end(l.t);
 		}
 		break;
+
 	case 'f': {
 		u32 k = vui_key();
 		TxtLoc t = cnext(l);
@@ -574,6 +656,27 @@ loop:
 			t = bprev(t);
 		}
 	} break;
+
+	case '/': {
+		if (last_search.s) free(last_search.s);
+		last_search = (Str) { 0, 0 };
+		Str src = get_input_line(S("Search: "));
+		if (!src.n) return 0;
+		last_search.s = malloc(src.n);
+		if (!last_search.s) FAIL_WITH_MSG("failed to allocate search");
+		memcpy(last_search.s, src.s, src.n);
+		last_search.n = src.n;
+		TxtLoc r;
+		if (search_next_regex(l, src, &r)) {
+			l = r;
+		}
+	} break;
+
+	case 'n': {
+		TxtLoc r;
+		if (last_search.n > 0 && search_next_regex(cnext(l), last_search, &r)) l = r;
+	} break;
+
 	default:
 		return 0;
 	}
-- 
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