Test code for generating unique combinations (for Nerd Fonts script)

combinations.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+# resouces
+# http://stackoverflow.com/questions/3846123/generating-permutations-using-bash
+# http://stackoverflow.com/questions/17762764/generate-all-possible-combinations-of-a-function-call-using-bash-script
+
+printf "# %s\n" {fontawesome,},{octicons,},{fontlinux,},{pomicons,},{powerlineextra,}
+
+
+printf "# - %s\n" --{fontawesome,}--{octicons,}--{fontlinux,}--{pomicons,}--{powerlineextra,}
+
+
+perm() {
+  local items="$1"
+  local out="$2"
+  local i
+  [[ "$items" == "" ]] && echo "$out" && return
+  for (( i=0; i<${#items}; i++ )) ; do
+    perm "${items:0:i}${items:i+1}" "$out${items:i:1}"
+    done
+  }
+while read line ; do perm $line ; done < File
+
+
+echo --{fa,}{o,} 
+printf "--{fa,}{o,}"
+
+printf " %s\n" {fa,}{o,}
+
+printf " %s\n" --{fontawesome,}{octicons,}{fontlinux,}{pomicons,},{powerlineextra,},{fontawesomeextension,}
+
+# this seems to be working:
+printf " %s\n" {--fontawesome,}\ {--octicons,}
+
+# too many spaces:
+printf " %s\n" {--fontawesome,}\ {--octicons,}\ {--fontlinux,}\ {--pomicons,}\ {--powerlineextra,}\ {--fontawesomeextension,}
+
+# try to eliminate build up of spaces:
+
+printf " %s\n" {' --fontawesome',}{' --octicons',}{--fontlinux,}{--pomicons,}{--powerlineextra,}{--fontawesomeextension,}
+
+# lookin' good:
+printf " %s\n" {' --fontawesome',}{' --octicons',}{' --fontlinux',}{' --pomicons',}{' --powerlineextra',}{' --fontawesomeextension',}{' --powersymbols',}

unique-combinations.sh

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+#!/bin/bash
+# http://stackoverflow.com/questions/26176481/generate-combinations-of-elements-with-echo
+
+POWER=$((2**$#))
+#BITS=`seq -f '0' -s '' 1 $#`
+BITS=`eval echo {1..$#} | sed -E 's/[0-9]+[ ]*/0/g'`
+
+while [ $POWER -gt 1 ];do
+  POWER=$(($POWER-1))
+  BIN=`bc <<< "obase=2; $POWER"`
+  MASK=`echo $BITS | sed -e "s/0\{${#BIN}\}$/$BIN/" | grep -o .`
+  POS=1; AWK=`for M in $MASK;do
+    [ $M -eq 1 ] && echo -n "print \\$\${POS};"
+    POS=$(($POS+1))
+    done;echo`
+  awk -v ORS=" " "{$AWK}" <<< "$@" | sed 's/ $//'
+done