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[bug#36021] [PATCH] search-paths: 'environment-variable-definition' outp

From: Dan Frumin
Subject: [bug#36021] [PATCH] search-paths: 'environment-variable-definition' output for fish
Date: Fri, 31 May 2019 12:41:10 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

Hi Guix!

Some background on this patch:
Right now whenever I do any Guix operation that requires me to modify environment variables (e.g. installing a Guile library requires me to update $GUILE_LOAD_PATH afterwards), Guix helpful tells me what commands I have to run to update the variables.

However, those commands are currently in bash/POSIX(?) format `export VAR=VALUE`. I've modified the `environment-variable-definition` function to support the syntax for Fish shell as well. I don't know if this method of looking at the $SHELL variable is sound, but it works on my machine.

Documentation for the `set' function in Fish:

PS: this is my first non-package patch for Guix so I apologize if there is 
something wrong with the patch

Best regards,

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