[PATCH] added colored print out of log levels

[Sascha Hauer]

HI Eugen,

On Fri, Feb 09, 2018 at 01:28:45PM +0100, Eugen Wiens wrote:
> When the system is booting the warnings and errors are not be quickly discovered.
> With this improvement the errors are colored red, the warnings yellow and the notices blue.

I like this because I like colors ;)
However, some people do not. Can we make this honour the value of the
global.allow_color variable? This variable is currently only used in the
environment, so we would have to move it to C code by adding a
globalvar_add_simple_bool().

> 
> Signed-off-by: Eugen Wiens <eugen.wiens at jumo.net>
> ---
>  common/Kconfig          |  8 ++++++++
>  common/console_common.c | 29 ++++++++++++++++++++++++++++-
>  2 files changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index 57418ca..461ad35 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -1000,6 +1000,14 @@ config DEFAULT_LOGLEVEL
>  	  7    debug-level messages (debug)
>  	  8    verbose debug messages (vdebug)
>  
> +config PRINT_COLORED_LOG_LEVEL
> +	prompt "enable colored printing of the log level"
> +	bool
> +	default n
> +	help
> +		Enable the print out of the colored log level.

I don't think it's worth having an extra config option for this.
If we get concerned about the code size, then we should rather
add a global color control Kconfig option and let everything color
related depend on this.

Something like:

config CONSOLE_ALLOW_COLOR
	prompt "Allow colored console output"
	bool

static unsigned int allow_color;

bool __console_allow_color(void)
{
	return allow_color;
}

Some initcall:
	globalvar_add_simple_bool("allow_color", &allow_color);

include/:

static inline bool console_allow_color(void)
{
	if (!IS_ENABLED(CONFIG_CONSOLE_ALLOW_COLOR))
		return false;
	return __console_allow_color();
}

Sascha

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