[Buildroot] [PATCH v2] core: enhance printvars for variables with newlines

[Yann E. MORIN <yann.morin.1998@free.fr>]

Stefan, All,

On 2018-04-19 10:40 +0300, Stefan Becker spake thusly:
> The current output formats of printvars do not preserve newlines.

This is wrong, as I explained in my reply to your previous iteration:

    http://lists.busybox.net/pipermail/buildroot/2018-April/219369.html

I am still not convinced by this new iteration... Basically, it changes
the start and stop makers from 'define' and 'endef' to MULTILINE_VAR_START
and MULTILINE_VAR_END; this is no real improvement. Note: I've seen your
other reply that sugest changing the marker so something else, and I
don;t think this is a better improvement either...

But I'm leaving this new iteration open for more reviews by others.

Regards,
Yann E. MORIN.

> Add
> the option MULTILINE_VARS which causes the variable content to be dumped
> in a format that preserves newlines:
> 
>    MULTILINE_VAR_START VAR
>    ... line 1 ...
>    ... line 2 ...
>    ...
>    MULTILINE_VAR_END VAR
> 
> Updated the manual accordingly.
> 
> Signed-off-by: Stefan Becker <chemobejk@gmail.com>
> ---
>  Makefile                  | 10 +++++++---
>  docs/manual/make-tips.txt | 20 ++++++++++++++++++++
>  2 files changed, 27 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 54f940659c..bd78da8362 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -979,9 +979,13 @@ printvars:
>  		$(sort $(if $(VARS),$(filter $(VARS),$(.VARIABLES)),$(.VARIABLES))), \
>  		$(if $(filter-out environment% default automatic, \
>  				$(origin $V)), \
> -		$(if $(QUOTED_VARS),\
> -			$(info $V='$(subst ','\'',$(if $(RAW_VARS),$(value $V),$($V)))'), \
> -			$(info $V=$(if $(RAW_VARS),$(value $V),$($V))))))
> +		$(if $(MULTILINE_VARS), \
> +			$(info MULTILINE_VAR_START $V) \
> +			$(info $(if $(RAW_VARS),$(value $V),$($V))) \
> +			$(info MULTILINE_VAR_END $V), \
> +			$(if $(QUOTED_VARS),\
> +				$(info $V='$(subst ','\'',$(if $(RAW_VARS),$(value $V),$($V)))'), \
> +				$(info $V=$(if $(RAW_VARS),$(value $V),$($V)))))))
>  # ' Syntax colouring...
>  
>  .PHONY: clean
> diff --git a/docs/manual/make-tips.txt b/docs/manual/make-tips.txt
> index ea1d825bef..c796bd73e2 100644
> --- a/docs/manual/make-tips.txt
> +++ b/docs/manual/make-tips.txt
> @@ -92,6 +92,8 @@ It is possible to tweak the output using some variables:
>  
>  - +VARS+ will limit the listing to variables which names match the
>    specified make-pattern
> +- +MULTILINE_VARS+, if set to +YES+, will use a start and end marker around
> +  the variable content to preserve newlines in the value
>  - +QUOTED_VARS+, if set to +YES+, will single-quote the value
>  - +RAW_VARS+, if set to +YES+, will print the unexpanded value
>  
> @@ -106,6 +108,24 @@ For example:
>   BUSYBOX_RDEPENDENCIES=ncurses util-linux
>  ----
>  
> +----
> + $ make -s printvars VARS=BUSYBOX_%DEPENDENCIES MULTILINE_VARS=YES
> + MULTILINE_VAR_START BUSYBOX_DEPENDENCIES
> + skeleton toolchain
> + MULTILINE_VAR_END BUSYBOX_DEPENDENCIES
> + MULTILINE_VAR_START BUSYBOX_FINAL_ALL_DEPENDENCIES
> + skeleton toolchain
> + MULTILINE_VAR_END BUSYBOX_FINAL_ALL_DEPENDENCIES
> + MULTILINE_VAR_START BUSYBOX_FINAL_DEPENDENCIES
> + skeleton toolchain
> + MULTILINE_VAR_END BUSYBOX_FINAL_DEPENDENCIES
> + MULTILINE_VAR_START BUSYBOX_FINAL_PATCH_DEPENDENCIES
> + MULTILINE_VAR_END BUSYBOX_FINAL_PATCH_DEPENDENCIES
> + MULTILINE_VAR_START BUSYBOX_RDEPENDENCIES
> + ncurses util-linux'linux-pam skeleton toolchain host-skeleton host-ccache
> + MULTILINE_VAR_END BUSYBOX_RDEPENDENCIES
> +----
> +
>  ----
>   $ make -s printvars VARS=BUSYBOX_%DEPENDENCIES QUOTED_VARS=YES
>   BUSYBOX_DEPENDENCIES='skeleton toolchain'
> -- 
> 2.14.3
> 

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