add SKILL cheat to show (or change) game skill level (#1016)

* add SKILL cheat to show (or change) game skill level

* rephrase message, fix fast and respawn when changing from/to Nightmare

src/m_cheat.c

@@ -59,6 +59,8 @@ static void cheat_clev0();
 static void cheat_mypos();
 static void cheat_comp(char *buf);
 static void cheat_comp0();
+static void cheat_skill(char *buf);
+static void cheat_skill0();
 static void cheat_friction();
 static void cheat_pushers();
 static void cheat_tran();
@@ -185,6 +187,12 @@ struct cheat_s cheat[] = {
   {"comp",    NULL,                   not_net | not_demo | not_menu,
    {cheat_comp0} },
 
+  {"skill",    NULL,                  not_net | not_demo | not_menu,
+   {cheat_skill}, -1 },
+
+  {"skill",    NULL,                  not_net | not_demo | not_menu,
+   {cheat_skill0} },
+
   {"killem",     NULL,                not_net | not_demo,
    {cheat_massacre} },   // jff 2/01/98 kill all monsters
 
@@ -690,6 +698,26 @@ static void cheat_friction()
                                                "Variable Friction disabled");
 }
 
+extern const char *default_skill_strings[];
+
+static void cheat_skill0()
+{
+  doomprintf(MESSAGES_NONE, "Skill: %s", default_skill_strings[gameskill + 1]);
+}
+
+static void cheat_skill(char *buf)
+{
+  int skill = buf[0] - '0';
+
+  if (skill >= 1 && skill <= 5)
+  {
+    gameskill = skill - 1;
+    doomprintf(MESSAGES_NONE, "Next Level Skill: %s", default_skill_strings[gameskill + 1]);
+
+    G_SetFastParms(fastparm || gameskill == sk_nightmare);
+    respawnmonsters = gameskill == sk_nightmare || respawnparm;
+  }
+}
 
 // Pusher cheat
 // phares 3/10/98

src/m_menu.c

@@ -4125,7 +4125,7 @@ static void M_UpdateMouseLook(void)
   }
 }
 
-static const char *default_skill_strings[] = {
+const char *default_skill_strings[] = {
   // dummy first option because defaultskill is 1-based
   "", "ITYTD", "HNTR", "HMP", "UV", "NM", NULL
 };

src/m_misc.c

@@ -545,7 +545,7 @@ default_t defaults[] = {
     "default_skill",
     (config_t *) &defaultskill, NULL,
     {4}, {1,5}, number, ss_gen, wad_no,
-    "selects default skill (1 = TYTD, 2 = NTR, 3 = HMP, 4 = UV, 5 = NM)"
+    "selects default skill (1 = ITYTD, 2 = HNTR, 3 = HMP, 4 = UV, 5 = NM)"
   },
 
   { // killough 3/6/98: preserve autorun across games