From 9726b1e58352126252412e101432e64d46fc51ca Mon Sep 17 00:00:00 2001
From: Dennis Lee <dennis@dennislee.xyz>
Date: Sun, 28 Jun 2020 23:01:03 -0700
Subject: [PATCH] universcroll: mouse wheel only scroll in all modes

Scroll normally via scroll(1), without Shift, when outside of
`MODE_ALTSCREEN`. Inside an alt screen, continue to scroll normally
without Shift; in this mode, your scrolling is automatically translated
into ^Y and ^E. It just werks!

Based on the existing mouse-altscreen patch
https://st.suckless.org/patches/scrollback/
adapted for st(1) 0.8.4 and scroll(1).
---
 config.def.h | 10 +++++-----
 st.c         |  5 +++++
 st.h         |  1 +
 x.c          |  2 ++
 4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/config.def.h b/config.def.h
index 6f05dce..62e87da 100644
--- a/config.def.h
+++ b/config.def.h
@@ -173,11 +173,11 @@ static uint forcemousemod = ShiftMask;
  * Beware that overloading Button1 will disable the selection.
  */
 static MouseShortcut mshortcuts[] = {
-	/* mask                 button   function        argument       release */
-	{ XK_ANY_MOD,           Button2, selpaste,       {.i = 0},      1 },
-	{ ShiftMask,            Button4, ttysend,        {.s = "\033[5;2~"} },
+	/* mask                 button   function        argument      release alt */
+	{ XK_ANY_MOD,           Button2, selpaste,       {.i = 0},           1 },
+	{ XK_ANY_MOD,           Button4, ttysend,        {.s = "\033[5;2~"}, 0, -1 },
 	{ XK_ANY_MOD,           Button4, ttysend,        {.s = "\031"} },
-	{ ShiftMask,            Button5, ttysend,        {.s = "\033[6;2~"} },
+	{ XK_ANY_MOD,           Button5, ttysend,        {.s = "\033[6;2~"}, 0, -1 },
 	{ XK_ANY_MOD,           Button5, ttysend,        {.s = "\005"} },
 };

diff --git a/st.c b/st.c
index 76b7e0d..1f65453 100644
--- a/st.c
+++ b/st.c
@@ -1047,6 +1047,11 @@ tnew(int col, int row)
 	treset();
 }

+int tisaltscr(void)
+{
+	return IS_SET(MODE_ALTSCREEN);
+}
+
 void
 tswapscreen(void)
 {
diff --git a/st.h b/st.h
index 3d351b6..39cc054 100644
--- a/st.h
+++ b/st.h
@@ -87,6 +87,7 @@ void sendbreak(const Arg *);
 void toggleprinter(const Arg *);

 int tattrset(int);
+int tisaltscr(void);
 void tnew(int, int);
 void tresize(int, int);
 void tsetdirtattr(int);
diff --git a/x.c b/x.c
index 210f184..210dde9 100644
--- a/x.c
+++ b/x.c
@@ -34,6 +34,7 @@ typedef struct {
 	void (*func)(const Arg *);
 	const Arg arg;
 	uint  release;
+	int  altscrn;  /* 0: don't care, -1: not alt screen, 1: alt screen */
 } MouseShortcut;

 typedef struct {
@@ -446,6 +447,7 @@ mouseaction(XEvent *e, uint release)
 	for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
 		if (ms->release == release &&
 		    ms->button == e->xbutton.button &&
+		    (!ms->altscrn || (ms->altscrn == (tisaltscr() ? 1 : -1))) &&
 		    (match(ms->mod, state) ||  /* exact or forced */
 		     match(ms->mod, state & ~forcemousemod))) {
 			ms->func(&(ms->arg));
--
2.27.0