.functions: Remove calc

Instead, @alrra’s upstream version should be used.

https://github.com/alrra/dotfiles/blob/2133bfed5d8bd2544cb3554e49657979acbb0c2f/src/shell/bash_functions#L5-L31

Hopefully it can be released as a standalone script, installable through brew or npm.

Closes mathiasbynens#703.

.functions

@@ -1,23 +1,5 @@
 #!/usr/bin/env bash
 
-# Simple calculator
-function calc() {
-	local result="";
-	result="$(printf "scale=10;$*\n" | bc --mathlib | tr -d '\\\n')";
-	#                       └─ default (when `--mathlib` is used) is 20
-	#
-	if [[ "$result" == *.* ]]; then
-		# improve the output for decimal numbers
-		printf "$result" |
-		sed -e 's/^\./0./'        `# add "0" for cases like ".5"` \
-		    -e 's/^-\./-0./'      `# add "0" for cases like "-.5"`\
-		    -e 's/0*$//;s/\.$//';  # remove trailing zeros
-	else
-		printf "$result";
-	fi;
-	printf "\n";
-}
-
 # Create a new directory and enter it
 function mkd() {
 	mkdir -p "$@" && cd "$_";