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diff --git a/home-config/fish/functions/fenv.main.fish b/home-config/fish/functions/fenv.main.fish
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+# The MIT License (MIT)
+
+# Copyright (c) 2015 Derek Willian Stavis
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+
+function fenv.main
+  bash -c "$argv && env -0 >&31" 31>| while read -l -z env_var
+    set -l kv (string split -m 1 = $env_var); or continue
+    # Skip read-only variables
+    contains $kv[1] _ SHLVL PWD; and continue
+    string match -rq '^BASH_.*%%$' $kv[1]; and continue
+    # Variable
+    # - is not defined
+    # - OR variable differs
+    # - OR variable is not exported
+    if not set -q $kv[1]; or test "$$kv[1]" != $kv[2]; or not set -qx $kv[1]
+      set -gx $kv
+    end
+  end
+  return $pipestatus[1]
+end