From 942afdf4454743be6065e022fc31271c75c0f01c Mon Sep 17 00:00:00 2001
From: NRK <nrk@disroot.org>
Date: Mon, 16 Dec 2024 14:45:37 +0000
Subject: [PATCH] make Ctrl+w in xreadline similar to readline's

when there's multiple spaces, the previous logic didn't erase
them, e.g:

    a word   |   < before
    a word  |    < after Ctrl-w

this patch brings the behavior closer to readline's:

    a word   |   < before
    a |          < after Ctrl-w

this also slightly changes the behavior since '/' is no longer
considered a boundary.
---
 src/nnn.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/nnn.c b/src/nnn.c
index c2b7e08e..b0f2e0b2 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -180,6 +180,7 @@
 #define MAX(x, y)       ((x) > (y) ? (x) : (y))
 #define ISODD(x)        ((x) & 1)
 #define ISBLANK(x)      ((x) == ' ' || (x) == '\t')
+#define ISSPACE(x)      (ISBLANK(x) || (x) == '\n' || (x) == '\r' || (x) == '\f' || (x) == '\v')
 #define TOUPPER(ch)     (((ch) >= 'a' && (ch) <= 'z') ? ((ch) - 'a' + 'A') : (ch))
 #define TOLOWER(ch)     (((ch) >= 'A' && (ch) <= 'Z') ? ((ch) - 'A' + 'a') : (ch))
 #define ISUPPER_(ch)    ((ch) >= 'A' && (ch) <= 'Z')
@@ -3717,13 +3718,13 @@ static char *xreadline(const char *prefill, const char *prompt)
 				continue;
 			case CONTROL('W'):
 				printmsg(prompt);
-				do {
-					if (pos == 0)
-						break;
-					memmove(buf + pos - 1, buf + pos,
-						(len - pos) * WCHAR_T_WIDTH);
-					--pos, --len;
-				} while (buf[pos - 1] != ' ' && buf[pos - 1] != '/'); // NOLINT
+				lpos = pos;
+				while (pos > 0 && ISSPACE(buf[pos-1]))
+					--pos;
+				while (pos > 0 && !ISSPACE(buf[pos-1]))
+					--pos;
+				memmove(buf + pos, buf + lpos, (len - lpos) * WCHAR_T_WIDTH);
+				len -= lpos - pos;
 				continue;
 			case CONTROL('K'):
 				printmsg(prompt);