Fish Shell function for sourcing standard .env files

README.md

envsource

⚠️ NOTE (20.5.2023): I don't really use this function at all anymore since there are now tools such as Taskfile, which reads the .env file for me sparing me the need to pollute my session with environment variables.

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I've been using Fish shell for years which is great and all, but one thing that has got me frustrated is using it with .env files.

When attempting to run source .env in a project, I usually encounter this problem:

.env (line 2): Unsupported use of '='. In fish, please use 'set KEY value'.
from sourcing file .env
source: Error while reading file '.env'

This is because Fish wants environment variables to be exported with syntax set -gx KEY value instead of export KEY=valuein Bash and ZSH.

So, I added the envsource command into my functions. Ideally, I wouldn't have to do this as many projects use dotenv or similar library to read environment variables. Then again, many projects are not quite there.

envsource.fish

# Place this in your Fish functions folder to make it available immediately
# e.g. ~/.config/fish/functions/envsource.fish
#
# Usage: envsource <path/to/env>

function envsource
  for line in (cat $argv | grep -v '^#')
    set item (string split -m 1 '=' $line)
    set -gx $item[1] $item[2]
    echo "Exported key $item[1]"
  end
end

Alternative https://direnv.net/

Strip leading and trailing "

set -gx $item[1] (echo $item[2] | sed -E 's/^"(.+)"$/\1/g')

I am getting this every time:

envsource .env
Exported key LOCAL
Exported key email
Exported key EDGEDB_DSN
set: : invalid variable name. See `help identifiers`

~/src/config/fish/functions.fish (line 252):
        set -gx $item[1] $item[2]
        ^
in function 'envsource' with arguments '.env'

(Type 'help set' for related documentation)
Exported key
set: : invalid variable name. See `help identifiers`

~/src/config/fish/functions.fish (line 252):
        set -gx $item[1] $item[2]
        ^
in function 'envsource' with arguments '.env'

(Type 'help set' for related documentation)
Exported key
set: : invalid variable name. See `help identifiers`

~/src/config/fish/functions.fish (line 252):
        set -gx $item[1] $item[2]
        ^
in function 'envsource' with arguments '.env'

(Type 'help set' for related documentation)
Exported key

My .env looks like:

# local
LOCAL=true
email=nikita@
EDGEDB_DSN=edgedb://edgedb:HYmIkn

That is with @grahamannett function:

function envsource
    set -f envfile "$argv"
    if not test -f "$envfile"
        echo "Unable to load $envfile"
        return 1
    end
    while read line
        if not string match -qr '^#|^$' "$line" # skip empty lines and comments
            if string match -qr '=' "$line" # if `=` in line assume we are setting variable.
                set item (string split -m 1 '=' $line)
                set item[2] (eval echo $item[2]) # expand any variables in the value
                set -gx $item[1] $item[2]
                echo "Exported key: $item[1]" # could say with $item[2] but that might be a secret
            else
                eval $line # allow for simple commands to be run e.g. cd dir/mamba activate env
            end
        end
    end <"$envfile"
end

But also:

function envsource
    for line in (cat $argv | grep -v '^#')
        set item (string split -m 1 '=' $line)
        set -gx $item[1] $item[2]
        echo "Exported key $item[1]"
    end
end

@nikitavoloboev dunno, possibly you have an extra setting or something?