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Another alternative for text colors.

This commit is contained in:
wb2osz 2019-09-30 22:00:14 -04:00
parent e6c721a58d
commit 10ad90b3db
1 changed files with 50 additions and 34 deletions
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84
textcolor.c
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@ -35,9 +35,8 @@
* could interpret this but it doesn't seem to be available
* anymore so we use a different interface.
*
* References:
* Reference:
* http://en.wikipedia.org/wiki/ANSI_escape_code
* http://academic.evergreen.edu/projects/biophysics/technotes/program/ansi_esc.htm
*
*
@ -45,7 +44,9 @@
*
*
* Problem: The ANSI escape sequences, used on Linux, allow 8 basic colors.
* Problem: Years ago, when I started on this...
*
* The ANSI escape sequences, used for text colors, allowed 8 basic colors.
* Unfortunately, white is not one of them. We only have dark
* white, also known as light gray. To get brighter colors,
* we need to apply an attribute. On some systems, the bold
@ -53,10 +54,6 @@
* On other systems, we need to use the blink attribute to get
* bright colors, including white. However on others, blink
* does actually produce blinking characters.
*
* Several people have also complained that bright green is
* very hard to read against a light background. The current
* implementation does not allow easy user customization of colors.
*
* Previously, the only option was to put "-t 0" on the command
* line to disable all text color. This is more readable but
@ -68,6 +65,8 @@
* It always sends the same color control codes rather than
* detecting the terminal type and adjusting its behavior.
*
* Version 1.6:
*
* For a long time, there was a compile time distinction between
* ARM (e.g. Raspberry Pi) and other platforms. With the arrival
* of Raspbian Buster, we get flashing and the general Linux settings
@ -75,6 +74,8 @@
*
* Since there doesn't seem to be a single universal solution,
* the text color option will now be allowed to have multiple values.
* Several people have also complained that bright green is
* very hard to read against a light background so only dark green will be used.
*
*--------------------------------------------------------------------*/
@ -92,47 +93,58 @@
#else /* Linux, BSD, Mac OSX */
// Alternative 1:
// Was new in version 1.2, as suggested by IW2DHW.
// Tested with gnome-terminal and xterm.
// Raspbian Buster LXTerminal also likes this.
// (Should go back and check earlier versions - at one time I intentionally made ARM different.)
// Here we are using the RGB color format to set the background.
// Alas, PuTTY doesn't recognize the RGB format so the background is not set.
// Using RGB colors - New in version 1.6.
// Since version 1.2, we've been using RGB to set the background to white.
// From this we can deduce that pretty much everyone recognizes RGB colors by now.
// The only known exception was PuTTY 0.70 and this has been rectified in 0.71.
// Instead of picking 1 of 8 colors, and using some attribute to get bright, just specify it directly.
// This should eliminate the need to reset the background after messing with the bright/bold/blink
// attributes to get more than 8 colors.
// Alternative 2:
// We need "blink" (5) rather than the expected bright/bold (1)
// attribute to get bright white background on some terminals.
// Makes no sense but I stumbled across that somewhere.
// Was new in version 1.2, as suggested by IW2DHW.
// Tested with gnome-terminal and xterm.
// Raspbian Buster LXTerminal also likes this.
// There was probably an issue with an earlier release because I intentionally made ARM different at one time.
// This is your best choice for PuTTY. Background (around text but not rest of line) is set to white.
// On GNOME Terminal and LXTerminal, this produces blinking text with a gray background.
// Here we are using the RGB color format to set the background.
// PuTTY 0.70 doesn't recognize the RGB format so the background is not set.
// Instead of complaining about it, just upgrade to PuTTY 0.71.
// Alternative 3:
// For some terminals we needed "blink" (5) rather than the expected bright/bold (1)
// attribute to get bright white background.
// Makes no sense but I stumbled across that somewhere.
// In some cases, you might find background (around text but not rest of line) is set to white.
// On GNOME Terminal and LXTerminal, this produces blinking text with a gray background.
// Alternative 4:
// This is using the bright/bold attribute, as you would expect from the documentation.
// Whenever a dark color is used, the background is reset and needs to be set again.
// In recent tests, background is always gray, not white like it should be.
#define MAX_T 3
#define MAX_T 4
static const char *t_background_white[MAX_T+1] = { "", "\e[48;2;255;255;255m", "\e[5;47m", "\e[1;47m" };
static const char *t_background_white[MAX_T+1] = { "", "\e[48;2;255;255;255m", "\e[48;2;255;255;255m", "\e[5;47m", "\e[1;47m" };
static const char *t_black[MAX_T+1] = { "", "\e[0;30m" "\e[48;2;255;255;255m", "\e[0;30m" "\e[5;47m", "\e[0;30m" "\e[1;47m" };
static const char *t_red[MAX_T+1] = { "", "\e[1;31m" "\e[48;2;255;255;255m", "\e[1;31m" "\e[5;47m", "\e[1;31m" "\e[1;47m" };
static const char *t_green[MAX_T+1] = { "", "\e[1;32m" "\e[48;2;255;255;255m", "\e[1;32m" "\e[5;47m", "\e[1;32m" "\e[1;47m" };
static const char *t_dark_green[MAX_T+1]= { "", "\e[0;32m" "\e[48;2;255;255;255m", "\e[0;32m" "\e[5;47m", "\e[0;32m" "\e[1;47m" };
static const char *t_yellow[MAX_T+1] = { "", "\e[1;33m" "\e[48;2;255;255;255m", "\e[1;33m" "\e[5;47m", "\e[1;33m" "\e[1;47m" };
static const char *t_blue[MAX_T+1] = { "", "\e[1;34m" "\e[48;2;255;255;255m", "\e[1;34m" "\e[5;47m", "\e[1;34m" "\e[1;47m" };
static const char *t_magenta[MAX_T+1] = { "", "\e[1;35m" "\e[48;2;255;255;255m", "\e[1;35m" "\e[5;47m", "\e[1;35m" "\e[1;47m" };
static const char *t_cyan[MAX_T+1] = { "", "\e[0;36m" "\e[48;2;255;255;255m", "\e[0;36m" "\e[5;47m", "\e[0;36m" "\e[1;47m" };
static const char *t_black[MAX_T+1] = { "", "\e[38;2;0;0;0m", "\e[0;30m" "\e[48;2;255;255;255m", "\e[0;30m" "\e[5;47m", "\e[0;30m" "\e[1;47m" };
static const char *t_red[MAX_T+1] = { "", "\e[38;2;255;0;0m", "\e[1;31m" "\e[48;2;255;255;255m", "\e[1;31m" "\e[5;47m", "\e[1;31m" "\e[1;47m" };
static const char *t_green[MAX_T+1] = { "", "\e[38;2;0;255;0m", "\e[1;32m" "\e[48;2;255;255;255m", "\e[1;32m" "\e[5;47m", "\e[1;32m" "\e[1;47m" };
static const char *t_dark_green[MAX_T+1]= { "", "\e[38;2;0;192;0m", "\e[0;32m" "\e[48;2;255;255;255m", "\e[0;32m" "\e[5;47m", "\e[0;32m" "\e[1;47m" };
static const char *t_yellow[MAX_T+1] = { "", "\e[38;2;255;255;0m", "\e[1;33m" "\e[48;2;255;255;255m", "\e[1;33m" "\e[5;47m", "\e[1;33m" "\e[1;47m" };
static const char *t_blue[MAX_T+1] = { "", "\e[38;2;0;0;255m", "\e[1;34m" "\e[48;2;255;255;255m", "\e[1;34m" "\e[5;47m", "\e[1;34m" "\e[1;47m" };
static const char *t_magenta[MAX_T+1] = { "", "\e[38;2;255;0;255m", "\e[1;35m" "\e[48;2;255;255;255m", "\e[1;35m" "\e[5;47m", "\e[1;35m" "\e[1;47m" };
static const char *t_cyan[MAX_T+1] = { "", "\e[38;2;0;255;255m", "\e[0;36m" "\e[48;2;255;255;255m", "\e[0;36m" "\e[5;47m", "\e[0;36m" "\e[1;47m" };
/* Clear from cursor to end of screen. */
@ -148,10 +160,14 @@ static const char clear_eos[] = "\e[0J";
/*
* g_enable_color:
* 0 = disable text colors.
* 1 = default, should be good for LXTerminal, GNOME Terminal, xterm.
* 2 = alternative, best choice for PuTTY (i.e. remote login from Windows PC to Linux).
* 3 = another alternative. Additional suggestions are welcome.
* others... future possibility.
* 1 = default, should be good for LXTerminal >= 0.3.2, GNOME Terminal, xterm, PuTTY >= 0.71.
* 2 = what we had for a few earlier versions. Should be good for LXTerminal, GNOME Terminal, xterm.
* 3 = use 8 basic colors, blinking attribute to get brighter color. Best for older PuTTY.
* 4 = use 8 basic colors, bold attribute to get brighter color.
*
* others... future possibility - tell me if none of these work properly for your terminal type.
*
* 9 (more accurately any invalid value) = try all of them and exit.
*/
static int g_enable_color = 1;