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require "English"
module Dotenv
module Substitutions
# Substitute shell commands in a value.
#
# SHA=$(git rev-parse HEAD)
#
module Command
class << self
INTERPOLATED_SHELL_COMMAND = /
(?<backslash>\\)? # is it escaped with a backslash?
\$ # literal $
(?<cmd> # collect command content for eval
\( # require opening paren
([^()]|\g<cmd>)+ # allow any number of non-parens, or balanced
# parens (by nesting the <cmd> expression
# recursively)
\) # require closing paren
)
/x
def call(value, _env, _is_load)
# Process interpolated shell commands
value.gsub(INTERPOLATED_SHELL_COMMAND) do |*|
# Eliminate opening and closing parentheses
command = $LAST_MATCH_INFO[:cmd][1..-2]
if $LAST_MATCH_INFO[:backslash]
# Command is escaped, don't replace it.
$LAST_MATCH_INFO[0][1..-1]
else
# Execute the command and return the value
`#{command}`.chomp
end
end
end
end
end
end
end
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