1 files changed, 94 insertions, 0 deletions
diff --git a/src/path.sh b/src/path.sh
new file mode 100644
index 0000000..b1b1e8f
--- /dev/null
+++ b/src/path.sh
@@ -0,0 +1,94 @@
+# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+# This file is part of the "Configuration file sharing" project.
+# For details, see https://github.com/egor-tensin/config-links.
+# Distributed under the MIT License.
+
+# Making sure paths point to files/directories
+
+_traverse_path_usage() {
+    local prefix="${FUNCNAME[0]}"
+    [ "${#FUNCNAME[@]}" -gt 1 ] && prefix="${FUNCNAME[1]}"
+
+    local msg
+    for msg; do
+        echo "$prefix: $msg"
+    done
+
+    echo "usage: $prefix [-h|--help] [-0|--null|-z|--zero] [-e|--exist] [-f|--file] [-d|--directory] [--] [PATH]..."
+}
+
+traverse_path() {
+    local -a paths=()
+
+    local must_exist=
+    local type_flag=
+    local type_name=
+
+    local fmt='%s\n'
+
+    while [ "$#" -gt 0 ]; do
+        local key="$1"
+        shift
+
+        case "$key" in
+            -h|--help)
+                _traverse_path_usage
+                return 0
+                ;;
+            -0|--null|-z|--zero)
+                fmt='%s\0'
+                ;;
+            --)
+                break
+                ;;
+            -e|--exist)
+                must_exist=1
+                ;;
+            -d|--directory)
+                type_flag=-d
+                type_name="directory"
+                ;;
+            -f|--file)
+                type_flag=-f
+                type_name="regular file"
+                ;;
+            -*)
+                _traverse_path_usage "unrecognized parameter: $key" >&2
+                return 1
+                ;;
+            *)
+                paths+=("$key")
+                ;;
+        esac
+    done
+
+    paths+=("$@")
+
+    [ "${#paths[@]}" -eq 0 ] && return 0
+
+    if is_cygwin; then
+        local i
+        for i in "${!paths[@]}"; do
+            paths[$i]="$( cygpath -- "${paths[$i]}" )"
+        done
+    fi
+
+    local -a abs_paths=()
+
+    local path
+    while IFS= read -d '' -r path; do
+        if [ -n "$must_exist" ] && [ ! -e "$path" ]; then
+            dump "must exist: $path" >&2
+            return 1
+        fi
+
+        if [ -e "$path" ] && [ -n "$type_flag" ] && ! test "$type_flag" "$path"; then
+            dump "must be a $type_name: $path" >&2
+            return 1
+        fi
+
+        abs_paths+=("$path")
+    done < <( readlink -z --canonicalize-missing -- ${paths[@]+"${paths[@]}"} )
+
+    printf -- "$fmt" ${abs_paths[@]+"${abs_paths[@]}"}
+}