diff --git a/dotdrop/dotdrop.py b/dotdrop/dotdrop.py
index 7601e48..3dbe377 100644
--- a/dotdrop/dotdrop.py
+++ b/dotdrop/dotdrop.py
@@ -85,6 +85,7 @@ def cmd_install(o):
         return False
 
     t = Templategen(base=o.dotpath, variables=o.variables,
+                    func_file=o.func_file, filter_file=o.filter_file,
                     debug=o.debug)
     tmpdir = None
     if o.install_temporary:
@@ -205,6 +206,7 @@ def cmd_compare(o, tmp):
         return False
 
     t = Templategen(base=o.dotpath, variables=o.variables,
+                    func_file=o.func_file, filter_file=o.filter_file,
                     debug=o.debug)
     inst = Installer(create=o.create, backup=o.backup,
                      dry=o.dry, base=o.dotpath,
diff --git a/dotdrop/settings.py b/dotdrop/settings.py
index a6b3634..e375163 100644
--- a/dotdrop/settings.py
+++ b/dotdrop/settings.py
@@ -31,6 +31,8 @@ class Settings(DictParser):
     key_instignore = 'instignore'
     key_workdir = 'workdir'
     key_minversion = 'minversion'
+    key_func_file = 'func_file'
+    key_filter_file = 'filter_file'
 
     # import keys
     key_import_actions = 'import_actions'
@@ -45,7 +47,7 @@ class Settings(DictParser):
                  link_on_import=LinkTypes.NOLINK, longkey=False,
                  upignore=[], cmpignore=[], instignore=[],
                  workdir='~/.config/dotdrop', showdiff=False,
-                 minversion=None):
+                 minversion=None, func_file=[], filter_file=[]):
         self.backup = backup
         self.banner = banner
         self.create = create
@@ -65,6 +67,8 @@ class Settings(DictParser):
         self.link_dotfile_default = LinkTypes.get(link_dotfile_default)
         self.link_on_import = LinkTypes.get(link_on_import)
         self.minversion = minversion
+        self.func_file = func_file
+        self.filter_file = filter_file
 
     def _serialize_seq(self, name, dic):
         """serialize attribute 'name' into 'dic'"""
@@ -95,5 +99,7 @@ class Settings(DictParser):
         self._serialize_seq(self.key_cmpignore, dic)
         self._serialize_seq(self.key_upignore, dic)
         self._serialize_seq(self.key_instignore, dic)
+        self._serialize_seq(self.key_func_file, dic)
+        self._serialize_seq(self.key_filter_file, dic)
 
         return {self.key_yaml: dic}
diff --git a/dotdrop/templategen.py b/dotdrop/templategen.py
index d1db7db..ee0e3cb 100644
--- a/dotdrop/templategen.py
+++ b/dotdrop/templategen.py
@@ -23,10 +23,13 @@ COMMENT_END = '@@#}'
 
 class Templategen:
 
-    def __init__(self, base='.', variables={}, debug=False):
+    def __init__(self, base='.', variables={},
+                 func_file=[], filter_file=[], debug=False):
         """constructor
         @base: directory path where to search for templates
         @variables: dictionary of variables for templates
+        @func_file: file path to load functions from
+        @filter_file: file path to load filters from
         @debug: enable debug
         """
         self.base = base.rstrip(os.sep)
@@ -49,10 +52,19 @@ class Templategen:
         # adding header method
         self.env.globals['header'] = self._header
         # adding helper methods
-        self.env.globals['exists'] = jhelpers.exists
-        self.env.globals['exists_in_path'] = jhelpers.exists_in_path
-        self.env.globals['basename'] = jhelpers.basename
-        self.env.globals['dirname'] = jhelpers.dirname
+        if self.debug:
+            self.log.dbg('load global functions:')
+        self._load_funcs_to_dic(jhelpers, self.env.globals)
+        if func_file:
+            for f in func_file:
+                if self.debug:
+                    self.log.dbg('load custom functions from {}'.format(f))
+                self._load_path_to_dic(f, self.env.globals)
+        if filter_file:
+            for f in filter_file:
+                if self.debug:
+                    self.log.dbg('load custom filters from {}'.format(f))
+                self._load_path_to_dic(f, self.env.filters)
         if self.debug:
             self.log.dbg('template additional variables: {}'.format(variables))
 
@@ -84,6 +96,23 @@ class Templategen:
         """update variables"""
         self.env.globals.update(variables)
 
+    def _load_path_to_dic(self, path, dic):
+        mod = utils.get_module_from_path(path)
+        if not mod:
+            self.log.warn('cannot load module \"{}\"'.format(path))
+            return
+        self._load_funcs_to_dic(mod, dic)
+
+    def _load_funcs_to_dic(self, mod, dic):
+        """dynamically load functions from module to dic"""
+        if not mod or not dic:
+            return
+        funcs = utils.get_module_functions(mod)
+        for name, func in funcs:
+            if self.debug:
+                self.log.dbg('load function \"{}\"'.format(name))
+            dic[name] = func
+
     def _header(self, prepend=''):
         """add a comment usually in the header of a dotfile"""
         return '{}{}'.format(prepend, utils.header())
diff --git a/dotdrop/utils.py b/dotdrop/utils.py
index f89c122..c4b82e2 100644
--- a/dotdrop/utils.py
+++ b/dotdrop/utils.py
@@ -11,6 +11,8 @@ import os
 import uuid
 import shlex
 import fnmatch
+import inspect
+import importlib
 from shutil import rmtree
 
 # local import
@@ -192,3 +194,24 @@ def patch_ignores(ignores, prefix, debug=False):
     if debug:
         LOG.dbg('ignores after patching: {}'.format(new))
     return new
+
+
+def get_module_functions(mod):
+    """return a list of fonction from a module"""
+    funcs = []
+    for m in inspect.getmembers(mod):
+        name, func = m
+        if not inspect.isfunction(func):
+            continue
+        funcs.append((name, func))
+    return funcs
+
+
+def get_module_from_path(path):
+    """get module from path"""
+    if not path or not os.path.exists(path):
+        return None
+    module_name = os.path.basename(path).rstrip('.py')
+    loader = importlib.machinery.SourceFileLoader(module_name, path)
+    mod = loader.load_module()
+    return mod
diff --git a/tests-ng/filter_file.sh b/tests-ng/filter_file.sh
new file mode 100755
index 0000000..8043941
--- /dev/null
+++ b/tests-ng/filter_file.sh
@@ -0,0 +1,112 @@
+#!/usr/bin/env bash
+# author: deadc0de6 (https://github.com/deadc0de6)
+# Copyright (c) 2017, deadc0de6
+#
+# test jinja2 filters from filter_file
+# returns 1 in case of error
+#
+
+# exit on first error
+set -e
+
+# all this crap to get current path
+rl="readlink -f"
+if ! ${rl} "${0}" >/dev/null 2>&1; then
+  rl="realpath"
+
+  if ! hash ${rl}; then
+    echo "\"${rl}\" not found !" && exit 1
+  fi
+fi
+cur=$(dirname "$(${rl} "${0}")")
+
+#hash dotdrop >/dev/null 2>&1
+#[ "$?" != "0" ] && echo "install dotdrop to run tests" && exit 1
+
+#echo "called with ${1}"
+
+# dotdrop path can be pass as argument
+ddpath="${cur}/../"
+[ "${1}" != "" ] && ddpath="${1}"
+[ ! -d ${ddpath} ] && echo "ddpath \"${ddpath}\" is not a directory" && exit 1
+
+export PYTHONPATH="${ddpath}:${PYTHONPATH}"
+bin="python3 -m dotdrop.dotdrop"
+
+echo "dotdrop path: ${ddpath}"
+echo "pythonpath: ${PYTHONPATH}"
+
+# get the helpers
+source ${cur}/helpers
+
+echo -e "$(tput setaf 6)==> RUNNING $(basename $BASH_SOURCE) <==$(tput sgr0)"
+
+################################################################
+# this is the test
+################################################################
+
+# the dotfile source
+tmps=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+mkdir -p ${tmps}/dotfiles
+# the dotfile destination
+tmpd=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+#echo "dotfile destination: ${tmpd}"
+filter_file=`mktemp`
+filter_file2=`mktemp`
+
+# create the config file
+cfg="${tmps}/config.yaml"
+
+cat > ${cfg} << _EOF
+config:
+  backup: true
+  create: true
+  dotpath: dotfiles
+  filter_file:
+  - ${filter_file}
+  - ${filter_file2}
+dotfiles:
+  f_abc:
+    dst: ${tmpd}/abc
+    src: abc
+profiles:
+  p1:
+    dotfiles:
+    - f_abc
+_EOF
+#cat ${cfg}
+
+cat << _EOF > ${filter_file}
+def filter1(arg1):
+  return "filtered"
+def filter2(arg1, arg2=''):
+  return arg2
+_EOF
+
+cat << _EOF > ${filter_file2}
+def filter3(integer):
+  return str(int(integer) - 10)
+_EOF
+
+# create the dotfile
+echo "this is the test dotfile" > ${tmps}/dotfiles/abc
+
+# test imported function
+echo "{{@@ "abc" | filter1 @@}}" >> ${tmps}/dotfiles/abc
+echo "{{@@ "arg1" | filter2('arg2') @@}}" >> ${tmps}/dotfiles/abc
+echo "{{@@ "13" | filter3() @@}}" >> ${tmps}/dotfiles/abc
+
+# install
+cd ${ddpath} | ${bin} install -f -c ${cfg} -p p1 -V
+
+#cat ${tmpd}/abc
+
+grep '^filtered$' ${tmpd}/abc >/dev/null
+grep '^arg2$' ${tmpd}/abc >/dev/null
+grep '^3$' ${tmpd}/abc >/dev/null
+
+## CLEANING
+rm -rf ${tmps} ${tmpd} ${filter_file} ${filter_file2}
+
+echo "OK"
+exit 0
diff --git a/tests-ng/func_file.sh b/tests-ng/func_file.sh
new file mode 100755
index 0000000..85e1eaa
--- /dev/null
+++ b/tests-ng/func_file.sh
@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+# author: deadc0de6 (https://github.com/deadc0de6)
+# Copyright (c) 2017, deadc0de6
+#
+# test jinja2 functions from func_file
+# returns 1 in case of error
+#
+
+# exit on first error
+set -e
+
+# all this crap to get current path
+rl="readlink -f"
+if ! ${rl} "${0}" >/dev/null 2>&1; then
+  rl="realpath"
+
+  if ! hash ${rl}; then
+    echo "\"${rl}\" not found !" && exit 1
+  fi
+fi
+cur=$(dirname "$(${rl} "${0}")")
+
+#hash dotdrop >/dev/null 2>&1
+#[ "$?" != "0" ] && echo "install dotdrop to run tests" && exit 1
+
+#echo "called with ${1}"
+
+# dotdrop path can be pass as argument
+ddpath="${cur}/../"
+[ "${1}" != "" ] && ddpath="${1}"
+[ ! -d ${ddpath} ] && echo "ddpath \"${ddpath}\" is not a directory" && exit 1
+
+export PYTHONPATH="${ddpath}:${PYTHONPATH}"
+bin="python3 -m dotdrop.dotdrop"
+
+echo "dotdrop path: ${ddpath}"
+echo "pythonpath: ${PYTHONPATH}"
+
+# get the helpers
+source ${cur}/helpers
+
+echo -e "$(tput setaf 6)==> RUNNING $(basename $BASH_SOURCE) <==$(tput sgr0)"
+
+################################################################
+# this is the test
+################################################################
+
+# the dotfile source
+tmps=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+mkdir -p ${tmps}/dotfiles
+# the dotfile destination
+tmpd=`mktemp -d --suffix='-dotdrop-tests' || mktemp -d`
+#echo "dotfile destination: ${tmpd}"
+func_file=`mktemp`
+func_file2=`mktemp`
+
+# create the config file
+cfg="${tmps}/config.yaml"
+
+cat > ${cfg} << _EOF
+config:
+  backup: true
+  create: true
+  dotpath: dotfiles
+  func_file:
+  - ${func_file}
+  - ${func_file2}
+dotfiles:
+  f_abc:
+    dst: ${tmpd}/abc
+    src: abc
+profiles:
+  p1:
+    dotfiles:
+    - f_abc
+_EOF
+#cat ${cfg}
+
+cat << _EOF > ${func_file}
+def func1(something):
+  if something:
+    return True
+  return False
+_EOF
+
+cat << _EOF > ${func_file2}
+def func2(inp):
+  return not inp
+_EOF
+
+# create the dotfile
+echo "this is the test dotfile" > ${tmps}/dotfiles/abc
+
+# test imported function
+echo "{%@@ if func1(True) @@%}" >> ${tmps}/dotfiles/abc
+echo "this should exist" >> ${tmps}/dotfiles/abc
+echo "{%@@ endif @@%}" >> ${tmps}/dotfiles/abc
+
+echo "{%@@ if not func1(False) @@%}" >> ${tmps}/dotfiles/abc
+echo "this should exist too" >> ${tmps}/dotfiles/abc
+echo "{%@@ endif @@%}" >> ${tmps}/dotfiles/abc
+
+echo "{%@@ if func2(True) @@%}" >> ${tmps}/dotfiles/abc
+echo "nope" >> ${tmps}/dotfiles/abc
+echo "{%@@ endif @@%}" >> ${tmps}/dotfiles/abc
+
+echo "{%@@ if func2(False) @@%}" >> ${tmps}/dotfiles/abc
+echo "yes" >> ${tmps}/dotfiles/abc
+echo "{%@@ endif @@%}" >> ${tmps}/dotfiles/abc
+
+# install
+cd ${ddpath} | ${bin} install -f -c ${cfg} -p p1 -V
+
+#cat ${tmpd}/abc
+
+grep '^this should exist$' ${tmpd}/abc >/dev/null
+grep '^this should exist too$' ${tmpd}/abc >/dev/null
+grep '^yes$' ${tmpd}/abc >/dev/null
+set +e
+grep '^nope$' ${tmpd}/abc >/dev/null && exit 1
+set -e
+
+## CLEANING
+rm -rf ${tmps} ${tmpd} ${func_file} ${func_file2}
+
+echo "OK"
+exit 0
diff --git a/tests-ng/inst-link-default.sh b/tests-ng/inst-link-default.sh
index 5ff2794..b175f98 100755
--- a/tests-ng/inst-link-default.sh
+++ b/tests-ng/inst-link-default.sh
@@ -159,7 +159,7 @@ cd ${ddpath} | ${bin} install -f -c ${cfg} -p p1 -V
 rm -rf ${tmpd}/abc
 
 ## CLEANING
-rm -rf ${tmps} ${tmpd} ${scr}
+rm -rf ${tmps} ${tmpd}
 
 echo "OK"
 exit 0
diff --git a/tests-ng/jhelpers.sh b/tests-ng/jhelpers.sh
index ae72594..0e44adb 100755
--- a/tests-ng/jhelpers.sh
+++ b/tests-ng/jhelpers.sh
@@ -137,7 +137,7 @@ grep "dotfile dst filename: `basename ${tmpd}/def`" ${tmpd}/def
 grep "dotfile dst dirname: `dirname ${tmpd}/def`" ${tmpd}/def
 
 ## CLEANING
-rm -rf ${tmps} ${tmpd} ${scr}
+rm -rf ${tmps} ${tmpd}
 
 echo "OK"
 exit 0
diff --git a/tests-ng/recvariables.sh b/tests-ng/recvariables.sh
index 47b9831..c1a4f3d 100755
--- a/tests-ng/recvariables.sh
+++ b/tests-ng/recvariables.sh
@@ -102,7 +102,7 @@ grep '^dvar4: var1 var2 var3' ${tmpd}/abc >/dev/null
 #cat ${tmpd}/abc
 
 ## CLEANING
-rm -rf ${tmps} ${tmpd} ${scr}
+rm -rf ${tmps} ${tmpd}
 
 echo "OK"
 exit 0
diff --git a/tests-ng/symlink.sh b/tests-ng/symlink.sh
index 4d88ce2..829a9e7 100755
--- a/tests-ng/symlink.sh
+++ b/tests-ng/symlink.sh
@@ -215,7 +215,7 @@ cd ${ddpath} | ${bin} install -f -c ${cfg} -p p1 -V
 grep '^p1$' ${tmpd}/abc/file1
 
 ## CLEANING
-rm -rf ${tmps} ${tmpd} ${scr}
+rm -rf ${tmps} ${tmpd}
 
 echo "OK"
 exit 0