Data commit

Task/Range-extraction/UNIX-Shell/range-extraction.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/bash
+
+range_contract () (
+    add_range () {
+        case $(( current - range_start )) in
+            0) ranges+=( $range_start )          ;;
+            1) ranges+=( $range_start $current ) ;;
+            *) ranges+=("$range_start-$current") ;;
+        esac
+    }
+
+    ranges=()
+    range_start=$1
+    current=$1
+    shift
+
+    for number; do
+        if (( number > current+1 )); then
+            add_range
+            range_start=$number
+        fi
+        current=$number
+    done
+    add_range
+
+    x="${ranges[@]}"
+    echo ${x// /,}
+)
+
+range_contract 0 1 2 4 6 7 8 11 12 14 15 16 17 18 19 20 21 22 23 24 25 27 28 29 30 31 32 33 35 36 37 38 39