diff --git a/bin/ffconv b/bin/ffconv
index fce48ac..fe1429d 100755
--- a/bin/ffconv
+++ b/bin/ffconv
@@ -12,8 +12,7 @@ sfexamples+=("ffconv mp3 opus;Convert all mp3 files to opus")
 sfexamples+=("ffconv -m trash mp4 mkv;Convert all mp4 to mkv and move the original ones to './trash'")
 sfexamples+=("ffconv -d ~/music -l wma mp3;List all wma files from '~/music' and ask for converting them to mp3")
 
-# sf -- script framework (https://github.com/Deleh/sf)
-sftrs=$'\e[0m';sftbf=$'\e[1m';sftdim=$'\e[2m';sftul=$'\e[4m';sftblink=$'\e[5m';sftinv=$'\e[7m';sfthide=$'\e[8m';sftclr=$'\e[1A\e[K';sftk=$'\e[30m';sftr=$'\e[31m';sftg=$'\e[32m';sfty=$'\e[33m';sftb=$'\e[34m';sftm=$'\e[35m';sftc=$'\e[36m';sftw=$'\e[97m';function sferr { echo "${sftbf}${sftr}ERROR${sftrs} $1";[ -z "$2" ]&&exit 1;};function sfwarn { echo "${sftbf}${sfty}WARNING${sftrs} $1";};function sfask { if [ "$2" == "" ];then read -p "$1? [${sftbf}Y${sftrs}/${sftbf}n${sftrs}] " sfin;[[ "$sfin" =~ y|Y|^$ ]]&&sfin=true||sfin=false;else read -p "$1? [${sftbf}y${sftrs}/${sftbf}N${sftrs}] " sfin;[[ "$sfin" =~ n|N|^$ ]]&&sfin=false||sfin=true;fi;};function sfget { [ "$2" != "" ]&&read -p "$1 [${sftbf}$2${sftrs}]: " sfin||read -p "$1: " sfin;[ "$sfin" == "" ]&&[ "$2" != "" ]&&sfin="$2";};function _sferr { echo "${sftbf}${sftr}SF PARSE ERROR${sftrs} $1";exit 1;};OLDIFS=$IFS;IFS=";";_sfphead="";_sfpdesc="";_sfodesc="";_sfexamples="";_sfpargs=();declare -A _sfflags;declare -A _sfargs;for a in "${sfargs[@]}";do _sfsubst=${a//";"};_sfcount="$(((${#a} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${a}";_sfpargs+=("${_sfparsearr[0]}");_sfphead="$_sfphead ${_sfparsearr[0]}";_sfpdesc="$_sfpdesc  ${_sfparsearr[0]};${_sfparsearr[1]}\n";elif [ $_sfcount -eq 2 ];then read -r -a _sfparsearr<<<"${a}";_sfflags["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfflags["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}=false;_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]};${_sfparsearr[2]}\n";elif [ $_sfcount -eq 4 ];then read -r -a _sfparsearr<<<"${a}";_sfargs["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfargs["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}="${_sfparsearr[3]}";_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]} ${_sfparsearr[2]};${_sfparsearr[4]} (default: ${_sfparsearr[3]})\n";else _sferr "Wrong argument declaration: $a";fi;done;for e in "${sfexamples[@]}";do _sfsubst=${e//";"};_sfcount="$(((${#e} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${e}";_sfexamples="$_sfexamples  ${_sfparsearr[0]};${_sfparsearr[1]}\n";else _sferr "Wrong example declaration: $e";fi;done;IFS=$OLDIFS;function _sfusage { echo -n "Usage: $(basename $0)";[ "$_sfodesc" != "" ]&&echo -n " [OPTIONS]";echo -e "$_sfphead";[ ! -z ${sfdesc+x} ]&&echo -e "\n$sfdesc";if [ "$_sfpdesc" != "" ];then echo -e "\nPOSITIONAL ARGUMENTS";echo -e "$_sfpdesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfodesc" != "" ];then echo -e "\nOPTIONS";echo -e "$_sfodesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfexamples" != "" ];then echo -e "\nEXAMPLES";echo -e "$_sfexamples"|column -c 80 -s ";" -t -W 2;fi;if [ ! -z ${sfextra+x} ];then echo -e "\n$sfextra";fi;exit 0;};for a in "$@";do [ "$a" == "-h" ]||[ "$a" == "--help" ]&&_sfusage;done;while(("$#"));do if [ ! -z ${_sfflags["$1"]} ];then declare ${_sfflags["$1"]}=true;elif [ ! -z ${_sfargs["$1"]} ];then if [ -n "$2" ]&&[ "${2:0:1}" != "-" ];then declare ${_sfargs["$1"]}="$2";shift;else sferr "Argument for '$1' missing";fi;else if [ "${1:0:1}" == "-" ];then sferr "Unsupported argument: $1";else if [ "${#_sfpargs[@]}" != 0 ];then declare ${_sfpargs[0]}="$1";_sfpargs=("${_sfpargs[@]:1}");else sferr "Too many positional arguments";fi;fi;fi;shift;done;if [ ${#_sfpargs[@]} != 0 ];then for p in "${_sfpargs[@]}";do sferr "Positional argument '$p' missing" 0;done;exit 1;fi;unset a e _sfphead _sfpdesc _sfodesc _sfexamples _sfpargs _sfflags _sfargs _sferr _sfusage
+source "$(dirname $0)/../lib/sf"
 
 # Handle default directory
 [ "$directory" == "current work directory" ] && directory="."
diff --git a/bin/ffcut b/bin/ffcut
index 11bb4f2..6eb4649 100755
--- a/bin/ffcut
+++ b/bin/ffcut
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-# sf variables
+# sf
 sfdesc="Extract a part of a file."
 sfargs+=("FILE;File which will be cutted")
 sfargs+=("from;f;TIMESTAMP/SECONDS;0;Extract from TIMESTAMP/SECONDS")
@@ -9,8 +9,7 @@ sfargs+=("to;t;TIMESTAMP/DURATION;end;Extract to TIMESTAMP/DURATION")
 sfexamples+=("ffcut -t 5 video.mp4 -o cut.webm;Extract the first five seconds of 'video.mp4' to 'cut.webm'")
 sfexamples+=("ffcut -f 00:10:30 -t 00:14:15 video.mp4;Extract the part from 00:10:30 to 00:14:15 from 'video.mp4'")
 
-# sf -- script framework (https://github.com/Deleh/sf)
-sftrs=$'\e[0m';sftbf=$'\e[1m';sftdim=$'\e[2m';sftul=$'\e[4m';sftblink=$'\e[5m';sftinv=$'\e[7m';sfthide=$'\e[8m';sftclr=$'\e[1A\e[K';sftk=$'\e[30m';sftr=$'\e[31m';sftg=$'\e[32m';sfty=$'\e[33m';sftb=$'\e[34m';sftm=$'\e[35m';sftc=$'\e[36m';sftw=$'\e[97m';function sferr { echo "${sftbf}${sftr}ERROR${sftrs} $1";[ -z "$2" ]&&exit 1;};function sfwarn { echo "${sftbf}${sfty}WARNING${sftrs} $1";};function sfask { if [ "$2" == "" ];then read -p "$1? [${sftbf}Y${sftrs}/${sftbf}n${sftrs}] " sfin;[[ "$sfin" =~ y|Y|^$ ]]&&sfin=true||sfin=false;else read -p "$1? [${sftbf}y${sftrs}/${sftbf}N${sftrs}] " sfin;[[ "$sfin" =~ n|N|^$ ]]&&sfin=false||sfin=true;fi;};function sfget { [ "$2" != "" ]&&read -p "$1 [${sftbf}$2${sftrs}]: " sfin||read -p "$1: " sfin;[ "$sfin" == "" ]&&[ "$2" != "" ]&&sfin="$2";};function _sferr { echo "${sftbf}${sftr}SF PARSE ERROR${sftrs} $1";exit 1;};OLDIFS=$IFS;IFS=";";_sfphead="";_sfpdesc="";_sfodesc="";_sfexamples="";_sfpargs=();declare -A _sfflags;declare -A _sfargs;for a in "${sfargs[@]}";do _sfsubst=${a//";"};_sfcount="$(((${#a} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${a}";_sfpargs+=("${_sfparsearr[0]}");_sfphead="$_sfphead ${_sfparsearr[0]}";_sfpdesc="$_sfpdesc  ${_sfparsearr[0]};${_sfparsearr[1]}\n";elif [ $_sfcount -eq 2 ];then read -r -a _sfparsearr<<<"${a}";_sfflags["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfflags["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}=false;_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]};${_sfparsearr[2]}\n";elif [ $_sfcount -eq 4 ];then read -r -a _sfparsearr<<<"${a}";_sfargs["-${_sfparsearr[1]}"]="${_sfparsearr[0]}";_sfargs["--${_sfparsearr[0]}"]="${_sfparsearr[0]}";declare ${_sfparsearr[0]}="${_sfparsearr[3]}";_sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]} ${_sfparsearr[2]};${_sfparsearr[4]} (default: ${_sfparsearr[3]})\n";else _sferr "Wrong argument declaration: $a";fi;done;for e in "${sfexamples[@]}";do _sfsubst=${e//";"};_sfcount="$(((${#e} - ${#_sfsubst})))";if [ $_sfcount -eq 1 ];then read -r -a _sfparsearr<<<"${e}";_sfexamples="$_sfexamples  ${_sfparsearr[0]};${_sfparsearr[1]}\n";else _sferr "Wrong example declaration: $e";fi;done;IFS=$OLDIFS;function _sfusage { echo -n "Usage: $(basename $0)";[ "$_sfodesc" != "" ]&&echo -n " [OPTIONS]";echo -e "$_sfphead";[ ! -z ${sfdesc+x} ]&&echo -e "\n$sfdesc";if [ "$_sfpdesc" != "" ];then echo -e "\nPOSITIONAL ARGUMENTS";echo -e "$_sfpdesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfodesc" != "" ];then echo -e "\nOPTIONS";echo -e "$_sfodesc"|column -c 80 -s ";" -t -W 2;fi;if [ "$_sfexamples" != "" ];then echo -e "\nEXAMPLES";echo -e "$_sfexamples"|column -c 80 -s ";" -t -W 2;fi;if [ ! -z ${sfextra+x} ];then echo -e "\n$sfextra";fi;exit 0;};for a in "$@";do [ "$a" == "-h" ]||[ "$a" == "--help" ]&&_sfusage;done;while(("$#"));do if [ ! -z ${_sfflags["$1"]} ];then declare ${_sfflags["$1"]}=true;elif [ ! -z ${_sfargs["$1"]} ];then if [ -n "$2" ]&&[ "${2:0:1}" != "-" ];then declare ${_sfargs["$1"]}="$2";shift;else sferr "Argument for '$1' missing";fi;else if [ "${1:0:1}" == "-" ];then sferr "Unsupported argument: $1";else if [ "${#_sfpargs[@]}" != 0 ];then declare ${_sfpargs[0]}="$1";_sfpargs=("${_sfpargs[@]:1}");else sferr "Too many positional arguments";fi;fi;fi;shift;done;if [ ${#_sfpargs[@]} != 0 ];then for p in "${_sfpargs[@]}";do sferr "Positional argument '$p' missing" 0;done;exit 1;fi;unset a e _sfphead _sfpdesc _sfodesc _sfexamples _sfpargs _sfflags _sfargs _sferr _sfusage
+source "$(dirname $0)/../lib/sf"
 
 # Handle missing parameters
 [ "$from" == 0 ] && [ "$to" == "end" ] && sferr "Set at least '--from' or '--to'"
diff --git a/flake.nix b/flake.nix
index 5fac73c..ebf0f49 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,6 +19,7 @@
               '';
               installPhase = ''
                 install -m 755 -D bin/ffconv $out/bin/ffconv
+                install -m 644 -D lib/sf $out/lib/sf
               '';
             };
             ffcut = pkgs.stdenv.mkDerivation {
@@ -30,6 +31,7 @@
               '';
               installPhase = ''
                 install -m 755 -D bin/ffcut $out/bin/ffcut
+                install -m 644 -D lib/sf $out/lib/sf
               '';
             };
           };
diff --git a/lib/sf b/lib/sf
new file mode 100644
index 0000000..b3beb93
--- /dev/null
+++ b/lib/sf
@@ -0,0 +1,217 @@
+#!/usr/bin/env bash
+
+# sf -- script framework (https://github.com/Deleh/sf)
+
+# Text formatting variables
+sftrs=$'\e[0m'
+sftbf=$'\e[1m'
+sftdim=$'\e[2m'
+sftul=$'\e[4m'
+sftblk=$'\e[5m'
+sftinv=$'\e[7m'
+sfthd=$'\e[8m'
+sftclr=$'\e[1A\e[K'
+sftk=$'\e[30m'
+sftr=$'\e[31m'
+sftg=$'\e[32m'
+sfty=$'\e[33m'
+sftb=$'\e[34m'
+sftm=$'\e[35m'
+sftc=$'\e[36m'
+sftw=$'\e[97m'
+
+# Public output functions
+function sferr {
+    echo "${sftbf}${sftr}ERROR${sftrs} $1"
+    [ -z "$2" ] && exit 1
+}
+
+function sfwarn {
+    echo "${sftbf}${sfty}WARNING${sftrs} $1"
+}
+
+# Public input functions
+function sfask {
+    if [ "$2" == "" ]; then
+        read -p "$1? [${sftbf}Y${sftrs}/${sftbf}n${sftrs}] " sfin
+        [[ "$sfin" =~ y|Y|^$ ]] && sfin=true || sfin=false
+    else
+        read -p "$1? [${sftbf}y${sftrs}/${sftbf}N${sftrs}] " sfin
+        [[ "$sfin" =~ n|N|^$ ]] && sfin=false || sfin=true
+    fi
+}
+
+function sfget {
+    [ "$2" != "" ] && read -p "$1 [${sftbf}$2${sftrs}]: " sfin || read -p "$1: " sfin
+    [ "$sfin" == "" ] && [ "$2" != "" ] && sfin="$2"
+}
+
+# Internal error function
+function _sferr {
+    echo "${sftbf}${sftr}SF PARSE ERROR${sftrs} $1"
+    exit 1
+}
+
+# Declare variables for parsing
+OLDIFS=$IFS
+IFS=";"
+_sfphead=""
+_sfpdesc=""
+_sfodesc=""
+_sfexamples=""
+_sfpargs=()
+declare -A _sfflags
+declare -A _sfargs
+
+# Parse sf arguments
+for a in "${sfargs[@]}"; do
+
+    # Get amount of ;
+    _sfsubst=${a//";"}
+    _sfcount="$(((${#a} - ${#_sfsubst})))"
+
+    if [ $_sfcount -eq 1 ]; then
+
+        # Read positional argument declaration
+        read -r -a _sfparsearr <<< "${a}"
+
+        # Add to positional argument arry
+        _sfpargs+=("${_sfparsearr[0]}")
+
+        # Set usage header and description
+        _sfphead="$_sfphead ${_sfparsearr[0]}"
+        _sfpdesc="$_sfpdesc  ${_sfparsearr[0]};${_sfparsearr[1]}\n"
+
+    # Flags
+    elif [ $_sfcount -eq 2 ]; then
+
+        # Read flag declaration
+        read -r -a _sfparsearr <<< "${a}"
+
+        # Set mappings
+        _sfflags["-${_sfparsearr[1]}"]="${_sfparsearr[0]}"
+        _sfflags["--${_sfparsearr[0]}"]="${_sfparsearr[0]}"
+
+        # Set default value
+        declare ${_sfparsearr[0]}=false
+
+        # Set description
+        _sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]};${_sfparsearr[2]}\n"
+
+    # Arguments
+    elif [ $_sfcount -eq 4 ]; then
+
+        # Read argument declaration
+        read -r -a _sfparsearr <<< "${a}"
+
+        # Set mappings
+        _sfargs["-${_sfparsearr[1]}"]="${_sfparsearr[0]}"
+        _sfargs["--${_sfparsearr[0]}"]="${_sfparsearr[0]}"
+
+        # Set default value
+        declare ${_sfparsearr[0]}="${_sfparsearr[3]}"
+
+        # Set description
+        _sfodesc="$_sfodesc  -${_sfparsearr[1]}, --${_sfparsearr[0]} ${_sfparsearr[2]};${_sfparsearr[4]} (default: ${_sfparsearr[3]})\n"
+
+    else
+        _sferr "Wrong argument declaration: $a"
+    fi
+done
+
+# Parse examples
+for e in "${sfexamples[@]}"; do
+
+    # Get amount of ;
+    _sfsubst=${e//";"}
+    _sfcount="$(((${#e} - ${#_sfsubst})))"
+
+    if [ $_sfcount -eq 1 ]; then
+
+        # Read example
+        read -r -a _sfparsearr <<< "${e}"
+
+        _sfexamples="$_sfexamples  ${_sfparsearr[0]};${_sfparsearr[1]}\n"
+    else
+        _sferr "Wrong example declaration: $e"
+    fi
+done
+
+IFS=$OLDIFS
+
+# Usage function
+function _sfusage {
+    echo -n "Usage: $(basename $0)"
+    [ "$_sfodesc" != "" ] && echo -n " [OPTIONS]"
+    echo -e "$_sfphead"
+    [ ! -z ${sfdesc+x} ] && echo -e "\n$sfdesc"
+    if [ "$_sfpdesc" != "" ]; then
+        echo -e "\nPOSITIONAL ARGUMENTS"
+        echo -e "$_sfpdesc" | column -c 80 -s ";" -t -W 2
+    fi
+    if [ "$_sfodesc" != "" ]; then
+        echo -e "\nOPTIONS"
+        echo -e "$_sfodesc" | column -c 80 -s ";" -t -W 2
+    fi
+    if [ "$_sfexamples" != "" ]; then
+        echo -e "\nEXAMPLES"
+        echo -e "$_sfexamples" | column -c 80 -s ";" -t -W 2
+    fi
+    if [ ! -z ${sfextra+x} ]; then
+        echo -e "\n$sfextra"
+    fi
+    exit 0
+}
+
+# Check for help flag
+for a in "$@"; do
+    # Check if help flag ist set
+    [ "$a" == "-h" ] || [ "$a" == "--help" ] && _sfusage
+done
+
+# Parse arguments
+while (( "$#" )); do
+
+    # Check if flag
+    if [ ! -z ${_sfflags["$1"]} ]; then
+        declare ${_sfflags["$1"]}=true
+
+    # Check if argument
+    elif [ ! -z ${_sfargs["$1"]} ]; then
+
+        # Check if argument has value
+        if [ -n "$2" ] && [ "${2:0:1}" != "-" ]; then
+            declare ${_sfargs["$1"]}="$2"
+            shift
+        else
+            sferr "Argument for '$1' missing"
+        fi
+
+    # Handle positional arguments and wrong arguments/flags
+    else
+        # Check if arg starts with -
+        if [ "${1:0:1}" == "-" ]; then
+            sferr "Unsupported argument: $1"
+        else
+            # Set positional argument
+            if [ "${#_sfpargs[@]}" != 0 ]; then
+                declare ${_sfpargs[0]}="$1"
+                _sfpargs=("${_sfpargs[@]:1}")
+            else
+                sferr "Too many positional arguments"
+            fi
+        fi
+    fi
+    shift
+done
+
+# Check if positional arguments left
+if [ ${#_sfpargs[@]} != 0 ]; then
+    for p in "${_sfpargs[@]}"; do
+        sferr "Positional argument '$p' missing" 0
+    done
+    exit 1
+fi
+
+# Unset all internal variables and functions
+unset a e _sfphead _sfpdesc _sfodesc _sfexamples _sfpargs _sfflags _sfargs _sferr _sfusage