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Updated Coding Style (markdown)

Dirk Wetter 2015-12-21 17:42:37 +01:00
parent e19b0cc0c6
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Coding-Style.md

@ -2,11 +2,14 @@
### This is a short brain dump which is far from being complete
* PR *
* you make the life of the maintainer easier if it's only **one** patch w/ **one** functional change per PR
* Global variables
* in CAPS
* use them only when necessary
* in CAPS
* initialize them
* use readonly and variable types
* use ``readonly`` and variable types
* if it's going to be a cmd line switch, there has to be also a global ENV variable which can be used without the switch (see e.g. SNEAKY or SSL_NATIVE)
* local variables (all_lower_case)
@ -18,23 +21,18 @@
* test before PR! If it's a check you need two bad and two good examples which should work as expected (compare results e.g. with SSLlabs)
* don't use backticks anymore
* use double square instead of single square brackets
* use [shellcheck](https://github.com/koalaman/shellcheck) if possible
* especially with sed you need to be careful as GNU sed is only 80% compatible with BSD sed (`sed -i`,` \n`, `\t`, etc.).
* be careful with very advanced bash features. Mac OS X is still somewhat behind with bash -- it uses bash version 3
([http://tldp.org/LDP/abs/html/bashver4.html](differences))
* don't use additional binaries
* if you really, really need to use an additional one make sure it's available on the system before calling it
* don't use highly system depended binaries (rpm, ipconfig, ..) as it is not portable or requires lot's of efforts and ugly code to be portable.
* every operation (string, etc.) which works with bash internall functions: use them whenever possible (replacing tr/sed/awk)
* every operation (string, etc.) which works with bash internal functions: use them whenever possible (replacing tr/sed/awk), see e.g. http://www.cyberciti.biz/tips/bash-shell-parameter-substitution-2.html
* avoid a mix of e.g. (sed and awk) or (cut and sed) or (sed, tr and \<whatsoever\>).
* be careful with very advanced bash features. Mac OS X is still using bash version 3 ([http://tldp.org/LDP/abs/html/bashver4.html](differences))
* especially with ``sed`` you need to be careful as GNU sed is only 80% compatible with BSD sed (`sed -i`,` \n`, `\t`, etc.).
* always use a return value for a function/method