From b5a7ea63c249fa40af1f77d079c476e44ea4f7e6 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Mon, 11 May 2015 19:09:42 +0200
Subject: degesch: make mIRC formatting actually work

---
 degesch.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 115 insertions(+), 21 deletions(-)

diff --git a/degesch.c b/degesch.c
index 744cd87..501b63e 100644
--- a/degesch.c
+++ b/degesch.c
@@ -1475,7 +1475,7 @@ serialize_configuration (struct app_context *ctx, struct str *output)
 
 /// Builds a color pair for 256-color terminals with a 16-color backup value
 #define COLOR_256(name, c256) \
-	(COLOR_ ## name) & 0xFFFF | ((c256 << 16) & 0xFFFF)
+	((COLOR_ ## name) & 0xFFFF | ((c256 & 0xFFFF) << 16))
 
 static struct
 {
@@ -1729,6 +1729,104 @@ enum
 	ATTRIBUTE_INVERSE   = 1 << 3
 };
 
+struct attribute_printer
+{
+	struct app_context *ctx;            ///< Application context
+	terminal_printer_fn printer;        ///< Terminal printer
+	bool dirty;                         ///< Attributes are set
+
+	int want;                           ///< Desired attributes
+	int want_foreground;                ///< Desired foreground color
+	int want_background;                ///< Desired background color
+};
+
+static void
+attribute_printer_reset (struct attribute_printer *self)
+{
+	if (self->dirty)
+		tputs (self->ctx->attrs[ATTR_RESET], 1, self->printer);
+
+	self->dirty = false;
+}
+
+static void
+attribute_printer_init (struct attribute_printer *self,
+	struct app_context *ctx, terminal_printer_fn printer)
+{
+	self->ctx = ctx;
+	self->printer = printer;
+	self->dirty = true;
+
+	self->want = 0;
+	self->want_foreground = -1;
+	self->want_background = -1;
+}
+
+static void
+attribute_printer_apply (struct attribute_printer *self, int attribute)
+{
+	attribute_printer_reset (self);
+	if (attribute != ATTR_RESET)
+	{
+		tputs (self->ctx->attrs[attribute], 1, self->printer);
+		self->dirty = true;
+	}
+}
+
+// TODO: 256-color output
+//   -   8 color -> maybe bold, maybe inverse (should text be bold now?)
+//   -  16 color -> just use the fallback color
+//   -  88 color -> use the 256color value if available
+//   - 256 color -> use the 256color value if available
+
+static void
+attribute_printer_update (struct attribute_printer *self)
+{
+	int fg = 0;
+	if ((int16_t) (self->want_foreground >> 16) > 0)
+		fg = index_to_terminal_palette ((int16_t) (self->want_foreground >> 16));
+	int bg = 0;
+	if ((int16_t) (self->want_background >> 16) > 0)
+		bg = index_to_terminal_palette ((int16_t) (self->want_background >> 16));
+	if (fg <= 0) fg = (int16_t) (self->want_foreground);
+	if (bg <= 0) bg = (int16_t) (self->want_background);
+
+	int attributes = self->want;
+	if (max_colors == 8)
+	{
+		if (fg >= 8)
+		{
+			attributes |= ATTRIBUTE_BOLD;
+			fg -= 8;
+		}
+		if (bg >= 8)
+		{
+			attributes |= ATTRIBUTE_BOLD;
+			bg -= 8;
+		}
+	}
+
+	attribute_printer_reset (self);
+
+	if (fg >= 0) tputs (g_terminal.color_set_fg[fg], 1, self->printer);
+	if (bg >= 0) tputs (g_terminal.color_set_bg[bg], 1, self->printer);
+
+	if (attributes)
+		tputs (tparm (set_attributes,
+			0, // standout
+			attributes & ATTRIBUTE_UNDERLINE,
+			attributes & ATTRIBUTE_INVERSE,
+			0, // blink
+			0, // dim
+			attributes & ATTRIBUTE_BOLD,
+			0, // blank
+			0, // protect
+			0) // acs
+			, 1, self->printer);
+
+	self->dirty = true;
+}
+
 // --- Output formatter --------------------------------------------------------
 
 // This complicated piece of code makes attributed text formatting simple.
@@ -2030,10 +2128,10 @@ formatter_flush (struct formatter *self, FILE *stream)
 		return;
 	}
 
-	const char *attr_reset = self->ctx->attrs[ATTR_RESET];
-	tputs (attr_reset, 1, printer);
+	struct attribute_printer state;
+	attribute_printer_init (&state, self->ctx, printer);
+	attribute_printer_reset (&state);
 
-	bool is_attributed = false;
 	LIST_FOR_EACH (struct formatter_item, iter, self->items)
 	{
 		switch (iter->type)
@@ -2046,30 +2144,26 @@ formatter_flush (struct formatter *self, FILE *stream)
 			free (term);
 			break;
 		case FORMATTER_ITEM_ATTR:
-			if (is_attributed)
-			{
-				tputs (attr_reset, 1, printer);
-				is_attributed = false;
-			}
-			if (iter->attribute != ATTR_RESET)
-			{
-				tputs (self->ctx->attrs[iter->attribute], 1, printer);
-				is_attributed = true;
-			}
+			attribute_printer_apply (&state, iter->attribute);
+			state.want = 0;
+			state.want_foreground = -1;
+			state.want_background = -1;
+			break;
+		case FORMATTER_ITEM_SIMPLE:
+			state.want |= iter->attribute;
+			attribute_printer_update (&state);
 			break;
 		case FORMATTER_ITEM_FG_COLOR:
-			tputs (g_terminal.color_set_fg[iter->color], 1, printer);
-			is_attributed = true;
+			state.want_foreground = iter->color;
+			attribute_printer_update (&state);
 			break;
 		case FORMATTER_ITEM_BG_COLOR:
-			tputs (g_terminal.color_set_bg[iter->color], 1, printer);
-			is_attributed = true;
+			state.want_background = iter->color;
+			attribute_printer_update (&state);
 			break;
 		}
 	}
-
-	if (is_attributed)
-		tputs (attr_reset, 1, printer);
+	attribute_printer_reset (&state);
 }
 
 // --- Buffers -----------------------------------------------------------------
-- 
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