Merge pull request #109 from SirAiedail/feature/jinja-helper-exists-in-path

Add jinja helper to test executable in PATH

dotdrop/jhelpers.py

@@ -6,8 +6,14 @@ jinja2 helper methods
 """
 
 import os
+import shutil
 
 
 def exists(path):
     """return true when path exists"""
     return os.path.exists(os.path.expandvars(path))
+
+
+def exists_in_path(name, path=None):
+    """return true when executable exists in os path"""
+    return shutil.which(name, os.F_OK | os.X_OK, path) is not None

dotdrop/templategen.py

@@ -49,6 +49,7 @@ class Templategen:
         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
 
     def generate(self, src):
         """render template from path"""

tests-ng/jhelpers.sh

@@ -83,6 +83,19 @@ echo "{%@@ if exists('/dev/abcdef') @@%}" >> ${tmps}/dotfiles/abc
 echo "this should not exist" >> ${tmps}/dotfiles/abc
 echo "{%@@ endif @@%}" >> ${tmps}/dotfiles/abc
 
+# test exists_in_path
+cat >> ${tmps}/dotfiles/abc << _EOF
+{%@@ if exists_in_path('cat') @@%}
+this should exist too
+{%@@ endif @@%}
+_EOF
+
+cat >> ${tmps}/dotfiles/abc << _EOF
+{%@@ if exists_in_path('a_name_that_is_unlikely_to_be_chosen_for_an_executable') @@%}
+this should not exist either
+{%@@ endif @@%}
+_EOF
+
 #cat ${tmps}/dotfiles/abc
 
 # install
@@ -92,6 +105,8 @@ cd ${ddpath} | ${bin} install -f -c ${cfg} -p p1 -V
 
 grep '^this should exist' ${tmpd}/abc >/dev/null
 grep -v '^this should not exist' ${tmpd}/abc >/dev/null
+grep '^this should exist too' ${tmpd}/abc >/dev/null
+grep -v '^this should not exist either' ${tmpd}/abc >/dev/null
 
 #cat ${tmpd}/abc