feat: x-path-* as scripts, run other changes

local/bin/x-have

@@ -3,7 +3,7 @@
 which "$1" >&/dev/null
 
 if [ $? -eq 0 ]; then
-  echo 0
+  exit 0
 else
-  echo 1
+  exit 1
 fi

local/bin/x-path-append

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+#
+# Add a directory to the beginning of the PATH if it's not already there.
+# Usage: x-path-append <dir>
+
+x-path-remove "$1"
+export PATH="${PATH:+"$PATH:"}$1"
+

local/bin/x-path-prepend

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+#
+# Add a directory to the front of the PATH if it exists and is not already there
+# Usage: x-path-prepend <dir>
+
+export PATH="$1${PATH:+":$PATH"}"
+

local/bin/x-path-remove

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+#
+# Remove a directory from the PATH
+# Usage: x-path-remove <dir>
+
+export PATH=$(echo -n "$PATH" | awk -v RS=: -v ORS=: "\$0 != \"$1\"" | sed 's/:$//')
+