[riot-notifications] [RIOT-OS/RIOT] sys/log: add module for colorized logging (#11573)

Alexandre Abadie notifications at github.com
Fri May 24 13:46:31 CEST 2019

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### Contribution description

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- describe which part(s) of RIOT is (are) involved
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This PR adds a custom logging module for adding colors to displayed messages using ANSI escape codes. It can be useful to distinguish the type of messages displayed (ERROR, DEBUG, INFO, etc).
Colors are customizable using CFLAGS.

I add to patch the pyterm script to process the reset sequence correctly when the log message is not terminated by a newline. I haven't found a better solution so far.

### Testing procedure

This PR contains a modified version of the hello-world examples that will be replaced by a test application if people think it can be merged. So for the moment just use `hello-world`:

$ make  BOARD=<your favorite board> -C examples/hello-world flash term
$ RIOT_TERMINAL=socat make BOARD=<your favorite board> -C examples/hello-world flash term

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references

Based on #11572 

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

Please use keywords (e.g., fixes, resolve) with the links to the issues you
resolved, this way they will be automatically closed when your pull request
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-- Commit Summary --

  * boards/native: fix overriden INCLUDES leading to build failure
  * sys/log: add colored logging module
  * dist/tools/pyterm: fix handling of reset ANSI escape code
  * examples/hello-world: modified with log_color

-- File Changes --

    M boards/native/Makefile (2)
    M dist/tools/pyterm/pyterm (8)
    M examples/hello-world/Makefile (5)
    M examples/hello-world/main.c (11)
    M makefiles/pseudomodules.inc.mk (1)
    M sys/log/Makefile.include (4)
    A sys/log/log_color/log_module.h (110)

-- Patch Links --


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