Introduce exclusion patterns

The lsrc(1), rcup(1), and rcdn(1) commands now take any number of `-e`
flags, used to specify an exclusion pattern. This can also be controlled
via rcrc(5), the `EXCLUDES` variable.

An exclusion pattern specifies a file glob to skip. In the case of
lsrc(1), any file matching the glob is not listed; in rcup(1) it is not
symlinked; and in rcdn(1) it is not removed.

The file glob can be preceded by the name of a dotfiles directory
(separated from the file glob by a colon) to increase the specificity.

Useful for:

    rcdn -e rcrc
    rcup -d work-dotfiles -e bashrc
    rcup -d ~/.dotfiles -d wife-dotfiles -d sys-dotfiles -e wife-dotfiles:tigrc

1 files changed, 9 insertions, 1 deletions

diff --git a/share/rcm.sh.in b/share/rcm.sh.in
index f25665b..6dae15b 100644
--- a/share/rcm.sh.in
+++ b/share/rcm.sh.in
@@ -28,6 +28,14 @@ echo_error() {
   exit $exit_status
 }
 
+echo_stderr() {
+  echo $* >&2
+}
+
+is_relative() {
+  echo $1 | grep -vq '^/'
+}
+
 version() {
   cat << EOV
 $1 (rcm) $VERSION
@@ -47,7 +55,7 @@ handle_common_flags() {
     version $prog_name
     exit 0
   elif [ $verbosity -ge 2 ]; then
-    DEBUG=echo
+    DEBUG=echo_stderr
     VERBOSE=echo
     PRINT=echo
     MV="$MV -v"