switch from ~/opt/local/bin to ~/.local/bin

this is where systemd already expects things to be,
so this complements the OS instead of fighting it.

home/shrc

@@ -52,7 +52,13 @@ ROPATH() {
 
 umask 022 # umask should be reset else pip might make faulty installations.
 
-ADDPATH "$HOME/opt/local/bin"
+if [ -d "$HOME/opt/local/bin" ]; then
+    printf 'Warning: You have a %s directory\n         consider moving it to %s\n' \
+      '~/opt/local/bin' '~/.local/bin' >&2
+    ADDPATH "$HOME/opt/local/bin"
+else
+    ADDPATH "$HOME/.local/bin"
+fi
 
 # clean up problematic, potentially-inherited exports:
 unset PREFIX CC CPP CXX LD CFLAGS CPPFLAGS CXXFLAGS LDFLAGS

install

@@ -159,9 +159,9 @@ if ! [ -e .bash_profile ] || ! grep -qF .bashrc .bash_profile; then
 fi
 
 # delete any directory structure that may have been included with the OS.
-for d in Desktop Documents Downloads Music Pictures Public Templates Video Videos; do
+for d in bin Desktop Documents Downloads Music Pictures Public Templates Video Videos; do
     ! [ -d "$d" ] || rmdir "$f"
 done
 
 # create instead my preferred directory structure.
-mkdir -p opt/local/bin src work play || die "failed to create directories"
+mkdir -p .local/bin src work play || die "failed to create directories"

sh/noccom

@@ -10,7 +10,7 @@ noccom() { ### @-
     ### strip C-like comments; both multi-line and single-line.
     # the first expression is taken from this FAQ:
     # https://perldoc.perl.org/perlfaq6.html#How-do-I-use-a-regular-expression-to-strip-C-style-comments-from-a-file%3f
-    [ -s ~/opt/local/bin/noccom ] || cat > ~/opt/local/bin/noccom <<EOF
+    [ -s ~/.local/bin/noccom ] || cat > ~/.local/bin/noccom <<EOF
 #!/usr/bin/env perl
 
 \$/ = undef;
@@ -51,7 +51,7 @@ s#(^|\\n)\\s+#\$1#gs;
 print;
 EOF
 
-    perl ~/opt/local/bin/noccom "$@"
+    perl ~/.local/bin/noccom "$@"
 }
 
 [ -n "${preload+-}" ] || noccom "$@"