Direnv: Modify autoenv_fish to not override cd

Instead, automatically execute a function when the PWD variable changes.

home/.config/fish/config.fish

@@ -15,9 +15,8 @@ if status is-interactive
     # Override globals
     set -gx EDITOR nvim
 
-    # Enable direnv
-    # https://github.com/direnv/direnv
-    direnv hook fish | source
+    # Enable autoenv
+    source ~/.config/fish/functions/activate.fish
 
     # Aliases
     alias vim="nvim"

home/.config/fish/functions/activate.fish

@@ -0,0 +1,133 @@
+#!/usr/bin/env fish
+
+#
+# Autoenv for fish shell.
+# Based on, but heavily modified from:
+# https://github.com/loopbit/autoenv_fish
+#
+
+set AUTOENV_AUTH_FILE ~/.autoenv_authorized
+if [ -z "$AUTOENV_ENV_FILENAME" ]
+    set AUTOENV_ENV_FILENAME ".env"
+end
+
+# probe to see if we have access to a shasum command, otherwise disable autoenv
+if which gsha1sum 2>/dev/null >&2
+    # Okay
+else if which sha1sum 2>/dev/null >&2
+    # Okay
+else if which shasum 2>/dev/null >&2
+    # Okay
+else
+    echo "Autoenv cannot locate a compatible shasum binary; not enabling"
+    exit 1
+end
+
+# This function will be automatically called on directory change
+# without needing to override the `cd` command.
+function autoenv_init --on-variable PWD
+    set defIFS $IFS
+    set IFS (echo -en "\n\b")
+
+    set target $argv[1]
+    set home (dirname $HOME)
+    set search_dir $PWD
+
+    while [ $search_dir != / -a $search_dir != "$home" ]
+        set file "$search_dir/$AUTOENV_ENV_FILENAME"
+        if [ -e $file ]
+            set files $files $file
+        end
+        set search_dir (dirname $search_dir)
+    end
+
+    set numerator (count $files)
+    if [ $numerator -gt 0 ]
+        for x in (seq $numerator)
+            set envfile $files[$x]
+            autoenv_check_authz_and_run "$envfile"
+        end
+    end
+
+    set IFS $defIFS
+end
+
+function autoenv_run
+    set file "(realpath "$argv[1]")"
+    autoenv_check_authz_and_run "$file"
+end
+
+function autoenv_env
+    builtin echo "autoenv:" "$argv[1]"
+end
+
+function autoenv_printf
+    builtin printf "autoenv: "
+    builtin printf "$argv[1]"
+end
+
+function autoenv_indent
+    cat -e $argv[1] | sed 's/.*/autoenv:     &/'
+end
+
+function autoenv_hashline
+    # typeset envfile hash
+    set envfile $argv[1]
+    set hash (shasum "$envfile" | cut -d' ' -f 1)
+    echo "$envfile:$hash"
+end
+
+function autoenv_check_authz
+    # typeset envfile hash
+    set envfile $argv[1]
+    set hash (autoenv_hashline "$envfile")
+    touch $AUTOENV_AUTH_FILE
+    grep -Gq "$hash" $AUTOENV_AUTH_FILE
+end
+
+function autoenv_check_authz_and_run
+    set envfile $argv[1]
+    if autoenv_check_authz "$envfile"
+        autoenv_source "$envfile"
+        return 0
+    end
+    if [ -z $MC_SID ] #make sure mc is not running
+        autoenv_env
+        autoenv_env "WARNING:"
+        autoenv_env "This is the first time you are about to source $envfile":
+        autoenv_env
+        autoenv_env "    --- (begin contents) ---------------------------------------"
+        autoenv_indent "$envfile"
+        autoenv_env "    --- (end contents) -----------------------------------------"
+        autoenv_env
+        autoenv_printf "Are you sure you want to allow this? (y/N) \n"
+        read answer
+        if [ $answer = y -o $answer = Y ]
+            autoenv_authorize_env "$envfile"
+            autoenv_source "$envfile"
+        end
+    end
+end
+
+function autoenv_deauthorize_env
+    #typeset envfile
+    set envfile $argv[1]
+    cp "$AUTOENV_AUTH_FILE" "$AUTOENV_AUTH_FILE.tmp"
+    grep -Gv "$envfile:" "$AUTOENV_AUTH_FILE.tmp" >$AUTOENV_AUTH_FILE
+end
+
+function autoenv_authorize_env
+    #typeset envfile
+    set envfile $argv[1]
+    autoenv_deauthorize_env "$envfile"
+    autoenv_hashline "$envfile" >>$AUTOENV_AUTH_FILE
+end
+
+function autoenv_source
+    #TODO: Why are global vars not being passed to sourced script?
+    set -g AUTOENV_CUR_FILE $argv[1]
+    set -g AUTOENV_CUR_DIR (dirname $argv[1])
+    source "$argv[1]"
+    #set -e AUTOENV_CUR_FILE
+    #set -e AUTOENV_CUR_DIR
+end