cli/connhelper: add fork of mvdan.cc/sh/v3/syntax v3.10.0

This adds a local fork of the mvdan.cc/sh/v3/syntax package to provide the
Quote function without having to introduce additional (indirect) dependencies
of the mvdan.cc/sh module.

This commit does not compile as it references code not forked.

The following files were included:

- https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/syntax/quote.go
- https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/syntax/parser.go
- https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/LICENSE

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/connhelper/internal/syntax/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2016, Daniel Martí. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cli/connhelper/internal/syntax/doc.go

@@ -0,0 +1,13 @@
+// Package syntax is a fork of [mvdan.cc/sh/v3@v3.10.0/syntax].
+//
+// Copyright (c) 2016, Daniel Martí. All rights reserved.
+//
+// It is a reduced set of the package to only provide the [Quote] function,
+// and contains the [LICENSE], [quote.go] and [parser.go] files at the given
+// revision.
+//
+// [quote.go]: https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/syntax/quote.go
+// [parser.go]: https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/syntax/parser.go
+// [LICENSE]: https://raw.githubusercontent.com/mvdan/sh/refs/tags/v3.10.0/LICENSE
+// [mvdan.cc/sh/v3@v3.10.0/syntax]: https://pkg.go.dev/mvdan.cc/sh/v3@v3.10.0/syntax
+package syntax