Fix virtualenvwrapper; rewrite PATH stuff in Python

.ccgrc

@@ -4,35 +4,20 @@
 ### Functions
 ###################################################
 
-# append_path() and prepend_path() adapted from Fink's init.sh
+PATHMOD=$HOME/.pathmod.py
 
 # add to end of path
 append_path()
 {
-    if eval test -z "\$$1"
-    then
-        eval "export $1=$2"
-    fi
-
-    if ! eval test -z "\"\${$1##*:$2:*}\"" -o -z "\"\${$1%%*:$2}\"" -o -z "\"\${$1##$2:*}\"" -o -z "\"\${$1##$2}\""
-    then
-        eval "export $1=\$$1:$2"
-    fi
+    NEW_PATH=$(python ${PATHMOD} append $1 $2)
+    eval "export $1='${NEW_PATH}'"
 }
 
 # add to beginning of path
 prepend_path()
 {
-    if eval test -z "\$$1"
-    then
-      eval "export $1=$2"
-      return
-    fi
-
-    if ! eval test -z "\"\${$1##*:$2:*}\"" -o -z "\"\${$1%%*:$2}\"" -o -z "\"\${$1##$2:*}\"" -o -z "\"\${$1##$2}\""
-    then
-      eval "export $1=$2:\$$1"
-    fi
+    NEW_PATH=$(python ${PATHMOD} prepend $1 $2)
+    eval "export $1='${NEW_PATH}'"
 }
 
 prepend_path_if_exists()
@@ -95,7 +80,6 @@ esac
 ###################################################
 
 # My most common typo.
-# Dear Ubuntu, please stop telling me to "sudo apt-get install sl"
 alias sl=ls
 
 alias mv='mv -iv'
@@ -119,7 +103,7 @@ if [ "$(uname -s)" == "Darwin" ]; then
     # commands take precendence:
     #prepend_path PATH "/usr/local/bin"
     # need to force it:
-    PATH="/usr/local/bin:$PATH"
+    #PATH="/usr/local/bin:$PATH"
     # Fix Backspace/Delete confusion:
     stty erase ^?
     # XTerm's $MANPATH gets messed up, and I can't find where it's happening.
@@ -130,6 +114,16 @@ if [ "$(uname -s)" == "Darwin" ]; then
     alias pg_start='pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start'
     alias pg_stop="pg_ctl -D /usr/local/var/postgres stop -s -m fast"
     prepend_path_if_exists PATH "/usr/local/share/npm/bin"
+
+    # https://stackoverflow.com/a/49528037/4240806
+    # Configuration for virtualenv
+    export WORKON_HOME=$HOME/.virtualenvs
+    export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3
+    export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
+    #prepend_path_if_exists PATH "/Users/chadglendenin/Library/Python/3.8/bin"
+    source /usr/local/bin/virtualenvwrapper.sh
+
+    export BASH_SILENCE_DEPRECATION_WARNING=1
 else
     alias ls='ls -F --color=auto'
     BASH_GIT_COMPLETION="/etc/bash_completion.d/git"

.pathmod.py

@@ -0,0 +1,30 @@
+import argparse
+import os
+import sys
+from collections import OrderedDict
+
+parser = argparse.ArgumentParser()
+parser.add_argument('action', help='either "append" or "prepend"')
+parser.add_argument('variable',
+    help='existing shell variable name (e.g., PATH) containing PATH-type, colon-delimited list (e.g., "/bin:/usr/bin")')
+parser.add_argument('value', help='new value to add to the set (optionally if exists)')
+#parser.add_argument('--if-exists', help='only modify the existing path variable if the new path exists')
+args = parser.parse_args()
+
+path = os.environ.get(args.variable)
+path_split = path.split(':') if path else []
+od = OrderedDict([x, None] for x in path_split)
+
+action = args.action
+value = args.value
+if action == 'prepend':
+    new_od = OrderedDict({value: None})
+    new_od.update(od)
+    od = new_od
+elif action == 'append':
+    od[args.value] = None
+else:
+    print('"action" must be either "append" or "prepend"')
+    sys.exit(1)
+
+print(':'.join(od.keys()))