From 27877afc2acf735e54ef8b768683de7c1da108ae Mon Sep 17 00:00:00 2001
From: Andrei Drexler <makro@rq3.com>
Date: Sun, 24 Dec 2023 23:47:16 +0100
Subject: [PATCH] Offer to load autosave if present after selecting a map from
 the Levels menu or double-clicking it in Explorer

---
 Quake/common.c   | 37 +++++++++++++++++++++++++++++++++++++
 Quake/common.h   |  5 ++++-
 Quake/host_cmd.c |  4 ++--
 Quake/menu.c     | 39 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+), 3 deletions(-)

diff --git a/Quake/common.c b/Quake/common.c
index 78f4af4fa..dd74723db 100644
--- a/Quake/common.c
+++ b/Quake/common.c
@@ -1720,6 +1720,43 @@ char *COM_TempSuffix (unsigned seq)
 	return buf;
 }
 
+/*
+============
+COM_DescribeDuration
+
+Describes the given duration, e.g. "3 minutes"
+============
+*/
+void COM_DescribeDuration (char *out, size_t outsize, double seconds)
+{
+	const double SECOND = 1;
+	const double MINUTE = 60 * SECOND;
+	const double HOUR = 60 * MINUTE;
+	const double DAY = 24 * HOUR;
+	const double WEEK = 7 * DAY;
+	const double MONTH = 30.436875 * DAY;
+	const double YEAR = 365.2425 * DAY;
+
+	seconds = fabs (seconds);
+
+	if (seconds < 1)
+		q_strlcpy (out, "moments", outsize);
+	else if (seconds < 60 * SECOND)
+		q_snprintf (out, outsize, "%i second%s", PLURAL (seconds));
+	else if (seconds < 90 * MINUTE)
+		q_snprintf (out, outsize, "%i minute%s", PLURAL (seconds / MINUTE));
+	else if (seconds < DAY)
+		q_snprintf (out, outsize, "%i hour%s", PLURAL (seconds / HOUR));
+	else if (seconds < WEEK)
+		q_snprintf (out, outsize, "%i day%s", PLURAL (seconds / DAY));
+	else if (seconds < MONTH)
+		q_snprintf (out, outsize, "%i week%s", PLURAL (seconds / WEEK));
+	else if (seconds < YEAR)
+		q_snprintf (out, outsize, "%i month%s", PLURAL (seconds / MONTH));
+	else
+		q_snprintf (out, outsize, "%i year%s", PLURAL (seconds / YEAR));
+}
+
 /*
 ============
 COM_CreatePath
diff --git a/Quake/common.h b/Quake/common.h
index 2dea37d4a..fb65c1e1d 100644
--- a/Quake/common.h
+++ b/Quake/common.h
@@ -263,7 +263,7 @@ extern char *q_strupr (char *str);
 extern int q_snprintf (char *str, size_t size, const char *format, ...) FUNC_PRINTF(3,4);
 extern int q_vsnprintf(char *str, size_t size, const char *format, va_list args) FUNC_PRINTF(3,0);
 
-#define PLURAL(count)	(&"s"[(count)==1])
+#define PLURAL(count)	((int)(count)), (&"s"[((int)(count))==1])
 
 //============================================================================
 
@@ -312,6 +312,9 @@ void COM_ExtractExtension (const char *in, char *out, size_t outsize);
 char *COM_TempSuffix (unsigned seq);
 void COM_CreatePath (char *path);
 
+// Describes the given duration, e.g. "3 minutes"
+void COM_DescribeDuration (char *out, size_t outsize, double seconds);
+
 char *va (const char *format, ...) FUNC_PRINTF(1,2);
 // does a varargs printf into a temp buffer
 
diff --git a/Quake/host_cmd.c b/Quake/host_cmd.c
index 8cee9a643..b441a21ba 100644
--- a/Quake/host_cmd.c
+++ b/Quake/host_cmd.c
@@ -797,8 +797,8 @@ static void Modlist_RegisterAddons (void *param)
 		"Add-on server status:\n"
 		"%3d add-on%s available for download\n"
 		"%3d add-on%s already installed\n\n",
-		total - installed, PLURAL (total - installed),
-		installed, PLURAL (installed)
+		PLURAL (total - installed),
+		PLURAL (installed)
 	);
 
 	extramods_json = json;
diff --git a/Quake/menu.c b/Quake/menu.c
index 96496221c..eaac42d28 100644
--- a/Quake/menu.c
+++ b/Quake/menu.c
@@ -24,6 +24,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #include "bgmusic.h"
 #include "q_ctype.h"
 
+#include <time.h>
+
 cvar_t ui_mouse	= {"ui_mouse", "1", CVAR_ARCHIVE};
 cvar_t ui_mouse_sound = {"ui_mouse_sound", "0", CVAR_ARCHIVE};
 cvar_t ui_sound_throttle = {"ui_sound_throttle", "0.1", CVAR_ARCHIVE};
@@ -2002,6 +2004,43 @@ void M_SetSkillMenuMap (const char *name)
 
 void M_Menu_Skill_f (void)
 {
+	char autosave[MAX_OSPATH];
+
+	// If there's an autosave, offer to resume it instead of starting over
+	q_snprintf (autosave, sizeof (autosave), "%s/autosave/%s.sav", com_gamedir, m_skill_mapname);
+	if (Sys_FileExists (autosave))
+	{
+		char	message[256];
+		time_t	now, lastplayed;
+
+		time (&now);
+		if (Sys_GetFileTime (autosave, &lastplayed) && lastplayed <= now)
+		{
+			char duration[32];
+			COM_DescribeDuration (duration, sizeof (duration), difftime (lastplayed, now));
+			q_snprintf (message, sizeof (message),
+				"Load last autosave\n"
+				"from %s ago?\n"
+				"\n"
+				"(y/n)\n",
+				duration
+			);
+		}
+		else
+		{
+			q_snprintf (message, sizeof (message), "Load last autosave? (y/n)\n");
+		}
+
+		if (SCR_ModalMessage (message, 0.0f))
+		{
+			m_state = m_none;
+			key_dest = key_game;
+			Cbuf_AddText (va ("load \"autosave/%s\"\n", m_skill_mapname));
+			return;
+		}
+	}
+
+	// Show skill selection menu
 	IN_DeactivateForMenu();
 	key_dest = key_menu;
 	m_skill_prevmenu = m_state;