support "default colors"HEADmaster-fmsbw-cimaster

* The terminal's default foreground and background colors
  are now used by default (`sciteco --no-profile`), so SciTECO
  integrates naturally into all terminal color schemes, even
  dark-on-bright ones.
* The default Scintilla colors use only 0x000000 (COLOR_BLACK) and 0xC0C0C0 (COLOR_WHITE)
  now.
* You can use `7EJ` to configure the default colors in color
  schemes or your profile.
  All existing color schemes had to disable default colors
  (`-1,-1,7EJ`) since they wouldn't look well otherwise.
* You may add `-1,7EJ` to ~/.teco_ini when using a terminal emulator
  with a washed-out palettized COLOR_BLACK.
  We cannot detect the terminal's default colors automatically.
* Scinterm updated to v6.0.
  We require a not-yet-upstreamed patch:
  https://github.com/orbitalquark/scinterm/pull/40
* In fact, we might decide not to support default colors at all in Scinterm,
  so this feature should be considered experimental.

1 files changed, 32 insertions, 2 deletions

diff --git a/src/core-commands.c b/src/core-commands.c
index d2c8b9d..63d8dbc 100644
--- a/src/core-commands.c
+++ b/src/core-commands.c
@@ -2084,7 +2084,7 @@ teco_state_ecommand_flags(teco_machine_main_t *ctx, GError **error)
 /*$ EJ properties
  * [key]EJ -> value -- Get and set system properties
  * value,keyEJ
- * rgb,color,3EJ
+ * [fore,]back,7EJ
  * -EJ -> event
  * -2EJ -> y, x
  *
@@ -2136,6 +2136,7 @@ teco_state_ecommand_flags(teco_machine_main_t *ctx, GError **error)
  * first.
  * Memory limiting is enabled by default.
  * .IP 3:
+ * .SCITECO_TOPIC palette
  * This \fBwrite-only\fP property allows disabling use of
  * the 16 color palette of default colors when using
  * the Curses user interface.
@@ -2188,6 +2189,25 @@ teco_state_ecommand_flags(teco_machine_main_t *ctx, GError **error)
  * After changing the interval, the new value may become
  * active only after the previous interval expires.
  * Recovery files are not dumped in batch mode.
+ * .IP 7:
+ * .SCITECO_TOPIC "default colors"
+ * This \fBwrite-only\fP property allows configuring the default
+ * foreground and background colors, given as two
+ * Scintilla-encoded RGB (0xBBGGRR) numbers.
+ * When asked to draw these colors, the terminal's native
+ * default colors \(em which may be some kind of white on black or
+ * black on white \(em are used instead.
+ * Therefore this command does not change any colors on screen
+ * \(em it just defines placeholder values for the terminal's
+ * default colors.
+ * This may be used e.g. to get a true black background where
+ * the terminal emulator's palette uses a different hue for
+ * Curses color COLOR_BLACK without having to resort to
+ * color redefinitions.
+ * With caution this may even be used to build color schemes that
+ * work both on white on black and black on white terminals.
+ * Use -1 to disable default foreground or background colors.
+ * It has no effect when using the GTK interface.
  * .
  * .IP -1:
  * Type of the last mouse event (\fBread-only\fP).
@@ -2242,7 +2262,8 @@ teco_state_ecommand_properties(teco_machine_main_t *ctx, GError **error)
 		EJ_PALETTE,
 		EJ_CARETX,
 		EJ_CMDLINE_HEIGHT,
-		EJ_RECOVERY_INTERVAL
+		EJ_RECOVERY_INTERVAL,
+		EJ_DEFAULT_COLORS
 	};
 
 	static teco_int_t caret_x = 0;
@@ -2298,6 +2319,15 @@ teco_state_ecommand_properties(teco_machine_main_t *ctx, GError **error)
 			/* FIXME: Perhaps signal the interface to reprogram timers */
 			break;
 
+		case EJ_DEFAULT_COLORS: {
+			teco_int_t fore;
+
+			if (!teco_expressions_pop_num_calc(&fore, -1, error))
+				return;
+			teco_interface_set_default_colors(fore, value);
+			break;
+		}
+
 		default:
 			g_set_error(error, TECO_ERROR, TECO_ERROR_FAILED,
 			            "Cannot set property %" TECO_INT_FORMAT " "