Change bootstrap to use standard stow functions

Removed the `autostow.sh` scipt. Its use was to call stow for every
folder in base directory and ignore certain folders. Both those
functions can be handled by stow on its own.

Stow allows defining per-directory ignore patterns with
`.stow-loca-ignore` files, which can be set to `.*` to completely ignore
a folder, just as before. And Stow can be called with a glob pattern to
automatically call it for every directory in the repository.

`.stowrc` additionally makes sure that all operations take place
targeting the home directory of the current user, since that is where
the dotfiles will (generally) be stored. Of course, this can be
overridden with the stow command-line options (see option precedence in
stow manual).

Finally, the bootstrap stow module adds an alias `dotlink` to the shell,
which allows fast (re-)stowing of all directories in the dotfile
repository. It uses a hard-coded location for the .dotfiles base
directory, so if the dotfiles are cloned anywhere else this has to be
customized.

_bootstrap/.config/sh/alias.d/dotlink.sh

@@ -0,0 +1,13 @@
+# relink all stowed files from anywhere
+# grepping is to remove meaningless stderr lines until this bug is fixed:
+# https://github.com/aspiers/stow/issues/65
+#
+# redirection is a neat way to filter stderr msgs by redirecting stderr
+# to stdout in a subshell, grepping in it, and redirecting back to stderr:
+# https://stackoverflow.com/a/15936384
+#
+# to customize this to your own needs, change the `push folder` to the
+# location of your dotfiles (stow) repository
+alias dotlink="pushd ~/.dotfiles;\
+  stow -R */ 2> >(grep -v 'Absolute/relative mismatch between Stow dir' 1>&2) ;\
+  popd"

_bootstrap/.stow-local-ignore

@@ -0,0 +1,4 @@
+# TODO find a more generic way to express 'ignore any non-folder files'
+
+^/install_packages.sh
+^/packages.csv

_bootstrap/autostow.sh

@@ -1,129 +0,0 @@
-#!/usr/bin/env bash
-#
-# autostow.sh
-#
-# Stow automatic symlinking script
-#
-# Invokes stow for every folder within this repository, and that's it.
-
-ignore="${AUTOSTOW_IGNORED_DIRS}"
-
-main() {
-  case "$1" in
-  -s | --stow)
-    have_stow
-    stow_dirs
-    exit 0
-    ;;
-  -d | --delete)
-    have_stow
-    unstow_dirs
-    exit 0
-    ;;
-  -n | --dry-run)
-    have_stow
-    dryrun
-    exit 0
-    ;;
-  -v | --version)
-    printf "System bootstrap script.\n\n©Marty Oehme\n\nVersion: 0.2.1\n"
-    ;;
-  -h | --help | *)
-    usage
-    exit 0
-    ;;
-  esac
-  shift
-}
-
-stow_dirs() {
-  printf "Creating dotfile symlinks .................................................\n"
-  for d in */; do
-
-    if is_ignored "$d"; then
-      printf "ignoring %s\n" "$d"
-      continue
-    fi
-
-    printf "stowing %s\n" "$d"
-    stow -S -t ~ "$d"
-  done
-  printf "Done creating symlinks ....................................................\n"
-}
-
-unstow_dirs() {
-  printf "Removing dotfile symlinks .................................................\n"
-  for d in */; do
-
-    if is_ignored "$d"; then
-      printf "ignoring %s\n" "$d"
-      continue
-    fi
-
-    printf "unstowing %s\n" "$d"
-    stow -D -t ~ "$d"
-  done
-  printf "Done removing symlinks ....................................................\n"
-}
-
-dryrun() {
-  printf "Printing processed directories ............................................\n"
-  for d in */; do
-
-    if is_ignored "$d"; then
-      printf "ignoring %s\n" "$d"
-      continue
-    fi
-
-    printf "processing %s\n" "$d"
-  done
-  printf "Done printing directories .................................................\n"
-}
-
-is_ignored() {
-  IFS=":"
-  for ign in $ignore; do
-    # it is either passed in through our environment variable
-    if [ "$ign" = "$1" ] || [ "$ign/" = "$1" ]; then
-      return 0
-    fi
-  done
-  # or it starts with a _ which is ignored by default (that's the regex).
-  # (using herestring to avoid cat>grep)
-  if grep -q -e '^_[[:alnum:]]\{1,\}' <<<"$1"; then return 0; fi
-  return 1
-}
-
-have_stow() {
-  if ! type stow >/dev/null 2>&1; then
-    printf "GNU stow needs to be installed for this script to function. Please install stow through your package manager.\n"
-    exit 1
-  fi
-}
-
-usage() {
-  printf "%s\n" \
-    "" \
-    " autostow.sh - Automatically stow your dotfiles." \
-    "               Uses GNU stow to set up automatic links to any dotfiles in subdirectories of this directory." \
-    "" \
-    " Usage: stow.sh -dhsn" \
-    "" \
-    " Options:" \
-    "" \
-    "     -h | --help     Print out this help." \
-    "" \
-    "     -s | --stow     Install dotfiles, by symlinking any directory found next to stow.sh using GNU stow." \
-    "" \
-    "     -d | --delete   Remove dotfiles, by unlinking any directory found next to stow.sh using GNU stow." \
-    "" \
-    "     -n | --dry-run  Do not invoke any operation but print out directories affected, simulating a dry-run." \
-    "" \
-    " Note, by default any directory starting with an underscore _directoryname will be ignored." \
-    " Additional folders to ignore can be set through the environment variable AUTOSTOW_IGNORED_DIRS " \
-    " using a colon-separated string: AUTOSTOW_IGNORED_DIRS=\"directories:to:ignore\"   " \
-    "" \
-    ""
-}
-
-main "$@"