From 3ea3614be94960fa04410c8cafc9ba2e982afb50 Mon Sep 17 00:00:00 2001
From: alrra <alrraa@gmail.com>
Date: Sun, 6 Jan 2013 00:54:10 +0200
Subject: .functions: Add `calc`

---
 .functions | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/.functions b/.functions
index c2c1556..db887fa 100644
--- a/.functions
+++ b/.functions
@@ -1,3 +1,21 @@
+# 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 "$@"
-- 
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