support encrypted files in "yadm list"

* export some helper functions to hooks

contrib/hooks/post_list

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+# yadm - Yet Another Dotfiles Manager
+# Copyright (C) 2015-2019 Tim Byrne and Martin Zuther
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+YADM_CHECKSUMS="$YADM_HOOK_DIR/files.checksums"
+
+
+# is current directory on yadm's work path?
+# (adapted from https://unix.stackexchange.com/a/6438/122163)
+if [ "${PWD##$YADM_HOOK_WORK}" != "$PWD" ]; then
+    ON_WORK_PATH=1
+else
+    ON_WORK_PATH=0
+fi
+
+
+# list all files or only those in the subdirectories below?
+OPTION_LIST_ALL=0
+for argument in ${YADM_HOOK_FULL_COMMAND[*]}; do
+    # mimick git ls-files by displaying all files when not on work
+    # path
+    if [ "$argument" = "-a" ] || [ $ON_WORK_PATH -eq 0 ]; then
+        OPTION_LIST_ALL=1
+        break
+    fi
+done
+
+
+# if there is no checksum file, exit with original status of yadm
+# command
+if [ ! -f "$YADM_CHECKSUMS" ]; then
+    exit "$YADM_HOOK_EXIT"
+fi
+
+# list encrypted files; try to satisfy the "list -a" argument and
+# beautify the output (requires "grep" and "sed")
+if command -v grep > /dev/null && command -v sed > /dev/null; then
+    # remove checksums from file names
+    while IFS= read -r filename; do
+        if [ $OPTION_LIST_ALL -eq 0 ]; then
+            # list only files in the subdirectories below (i.e. files
+            # whose relative path doesn't begin with "../")
+            REL_PATH=$(relative_path "$PWD" "$YADM_HOOK_WORK/$filename")
+
+            if ! echo "$REL_PATH" | grep '^\.\./' > /dev/null; then
+               echo "$REL_PATH"
+            fi
+        else
+            # list all files
+            echo "$filename"
+        fi
+    done <<< "$(sed -r 's/^\S+\s+//' "$YADM_CHECKSUMS")"
+else
+    # just display checksum file
+    cat "$YADM_CHECKSUMS"
+fi
+
+# return original exit status of yadm command
+exit "$YADM_HOOK_EXIT"

yadm

@@ -1591,6 +1591,12 @@ function invoke_hook() {
     export YADM_HOOK_WORK
     export YADM_ENCRYPT_INCLUDE_FILES
 
+    # export helper functions
+    export -f builtin_dirname
+    export -f relative_path
+    export -f unix_path
+    export -f mixed_path
+
     "$hook_command"
     hook_status=$?