This mod adds messages to computer terminals found in the game, increasing
"immersion": standing near a terminal will display a random message.

diff --git a/game.h b/game.h
index 991058d..a96df00 100755
--- a/game.h
+++ b/game.h
@@ -390,6 +390,7 @@ struct
                            0 (not saved), 1 (just saved) or 255 (can't save).*/
   uint8_t cheatState; /**< Highest bit say whether cheat is enabled, other bits
                            represent the state of typing the cheat code. */
+  const char *rollingMessage;
   uint8_t save[SFG_SAVE_SIZE];  /**< Stores the game save state that's kept in
                            the persistent memory.
 
@@ -467,6 +468,7 @@ struct
 
   SFG_ProjectileRecord projectileRecords[SFG_MAX_PROJECTILES];
   uint8_t projectileRecordCount;
+  uint8_t checkedTerminalIndex;
   uint8_t bossCount;
   uint8_t monstersDead;
   uint8_t backgroundImage;
@@ -1536,6 +1538,8 @@ void SFG_setAndInitLevel(uint8_t levelNumber)
   SFG_currentLevel.ceilingColor = level->ceilingColor;
   SFG_currentLevel.completionTime10sOfS = 0;
 
+  SFG_game.rollingMessage = 0;
+
   for (uint8_t i = 0; i < 7; ++i)
     SFG_currentLevel.textures[i] =
       SFG_wallTextures + level->textureIndices[i] * SFG_TEXTURE_STORE_SIZE;
@@ -1543,6 +1547,7 @@ void SFG_setAndInitLevel(uint8_t levelNumber)
   SFG_LOG("initializing doors");
 
   SFG_currentLevel.checkedDoorIndex = 0;
+  SFG_currentLevel.checkedTerminalIndex = 0;
   SFG_currentLevel.doorRecordCount = 0;
   SFG_currentLevel.projectileRecordCount = 0;
   SFG_currentLevel.teleporterCount = 0;
@@ -2762,6 +2767,41 @@ void SFG_updateLevel(void)
     p->doubleFramesToLive -= subtractFrames;
   }
 
+  // handle terminal texts:
+
+  if (SFG_game.rollingMessage)
+  {
+    if (SFG_game.frame % SFG_BLINK_PERIOD_FRAMES == 0)
+    {
+      SFG_game.rollingMessage++;
+
+      if (*SFG_game.rollingMessage == 0)
+        SFG_game.rollingMessage = 0;
+    }
+  }
+  else
+  {
+    const SFG_LevelElement *levelElement =
+      &(SFG_currentLevel.levelPointer->elements[
+      SFG_currentLevel.checkedTerminalIndex]);
+
+    if (levelElement->type == SFG_LEVEL_ELEMENT_TERMINAL)
+    {
+      int dx = ((int) levelElement->coords[0]) - 
+        ((int) SFG_player.squarePosition[0]);
+
+      int dy = ((int) levelElement->coords[1]) - 
+        ((int) SFG_player.squarePosition[1]);
+
+      if (dx * dx + dy * dy <= 2)
+        SFG_game.rollingMessage = SFG_terminalTexts[
+         SFG_currentLevel.checkedTerminalIndex % SFG_TERMIAL_TEXTS];
+    }
+
+    SFG_currentLevel.checkedTerminalIndex++;
+    SFG_currentLevel.checkedTerminalIndex %= SFG_MAX_LEVEL_ELEMENTS;
+  }
+
   // handle door:
   if (SFG_currentLevel.doorRecordCount > 0) // has to be here
   {
@@ -4876,6 +4916,12 @@ void SFG_draw(void)
 
     // draw HUD:
 
+    // terminal message:
+
+    if (SFG_game.rollingMessage)
+      SFG_drawText(SFG_game.rollingMessage,SFG_FONT_SIZE_MEDIUM,
+        SFG_FONT_SIZE_MEDIUM,SFG_FONT_SIZE_MEDIUM,7,255,0);
+
     // bar
 
     uint8_t color = 61;
diff --git a/texts.h b/texts.h
index b7e53d4..8e16434 100644
--- a/texts.h
+++ b/texts.h
@@ -53,6 +53,18 @@ static const char *SFG_outroText =
   "learned a lesson, never again allow capitalism and hierarchy. We can now "
   "rebuild society in peaceful anarchy.";
 
+#define SFG_TERMIAL_TEXTS 6
+
+static const char *SFG_terminalTexts[SFG_TERMIAL_TEXTS] =
+{
+  "To whoever might help - the AI brain is on the roof of Macrochip HQ.",
+  "Capitalism is how you enslave a man with his approval. --Macrochip CEO",
+  "Mailbox - The spiders are here. Tell family I love them. God help us.",
+  "Local data, 34012 active units, city 90 percent subdued, 1 intruder.",
+  "News - AI crossing ocean, overpowering army. Macrochip CEO gone.",
+  "Mailbox - Proprietary tech was our biggest error. If we live, stop capitalism."
+};
+
 #define SFG_MALWARE_WARNING ""
 
 #if SFG_OS_IS_MALWARE
