split update.sh into multiple files

1 files changed, 139 insertions, 0 deletions

diff --git a/bin/update.sh b/bin/update.sh
new file mode 100644
index 0000000..31f6494
--- /dev/null
+++ b/bin/update.sh
@@ -0,0 +1,139 @@
+#!/usr/bin/env bash
+
+# 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.
+
+# This script relies on the availability of native symlinks.
+# Those are indeed supported by NTFS, but require Administrator privileges for
+# creation.
+# It likely won't bother you as long as you don't use the functions defined in
+# this file.
+# In any case, you will see `ln` complaining about some access being denied in
+# case something goes wrong.
+#
+# Remember that in order to force `ln` to use native NTFS symlinks, your
+# `CYGWIN` Windows environment variable value **must** include either
+# `winsymlinks:native` or `winsymlinks:nativestrict`!
+
+# usage: ./update.sh [-h|--help] [-d|--database PATH] [-s|--shared-dir DIR] [-n|--dry-run]
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+script_name="$( basename -- "${BASH_SOURCE[0]}" )"
+readonly script_name
+script_dir="$( dirname -- "${BASH_SOURCE[0]}" )"
+script_dir="$( cd -- "$script_dir" && pwd )"
+readonly script_dir
+src_dir="$( cd -- "$script_dir/../src" && pwd )"
+readonly src_dir
+
+. "$src_dir/common.sh"
+. "$src_dir/path.sh"
+. "$src_dir/vars.sh"
+. "$src_dir/db.sh"
+
+# Cygwin-related stuff
+
+os="$( uname -o )"
+readonly os
+
+is_cygwin() {
+    test "$os" == 'Cygwin'
+}
+
+check_symlinks_enabled_cygwin() {
+    case "${CYGWIN-}" in
+        *winsymlinks:native*)       ;;
+        *winsymlinks:nativestrict*) ;;
+
+        *)
+            dump "native Windows symlinks aren't enabled in Cygwin" >&2
+            return 1
+            ;;
+    esac
+}
+
+# Main routines
+
+script_usage() {
+    local msg
+    for msg; do
+        echo "$script_name: $msg"
+    done
+
+    echo "usage: $script_name [-h|--help] [-d|--database PATH] [-s|--shared-dir DIR] [-n|--dry-run]
+  -h,--help          show this message and exit
+  -d,--database      set database file path
+  -s,--shared-dir    set top-level shared directory path
+                     (current working directory by default)
+  -n,--dry-run       don't actually do anything intrusive"
+}
+
+parse_script_options() {
+    while [ "$#" -gt 0 ]; do
+        local key="$1"
+        shift
+
+        case "$key" in
+            -h|--help)
+                script_usage
+                exit 0
+                ;;
+            -n|--dry-run)
+                set_dry_run
+                continue
+                ;;
+            -d|--database|-s|--shared-dir)
+                ;;
+            *)
+                script_usage "unrecognized parameter: $key" >&2
+                exit 1
+                ;;
+        esac
+
+        if [ "$#" -eq 0 ]; then
+            script_usage "missing argument for parameter: $key" >&2
+            exit 1
+        fi
+
+        local value="$1"
+        shift
+
+        case "$key" in
+            -d|--database)
+                update_database_path "$value"
+                ;;
+            -s|--shared-dir)
+                update_shared_dir "$value"
+                ;;
+            *)
+                script_usage "unrecognized parameter: $key" >&2
+                exit 1
+                ;;
+        esac
+    done
+}
+
+check_symlinks_enabled() {
+    if is_cygwin; then
+        check_symlinks_enabled_cygwin
+    else
+        return 0
+    fi
+}
+
+main() {
+    parse_script_options "$@"
+    check_symlinks_enabled
+    ensure_database_exists
+    read_database
+    delete_obsolete_entries
+    discover_new_entries
+    write_database
+}
+
+main "$@"