Function rewrite_links

pub fn rewrite_links(
    html_input: String,
    root_path: &Path,
    docdir: &Path,
    local_link_kind: LocalLinkKind,
    rewrite_ext: bool,
    allowed_local_links: Arc<RwLock<HashSet<PathBuf>>>,
) -> String

A helper function that scans the input HTML document in html_input for HTML hyperlinks. When it finds a relative URL (local link), it analyzes it’s path. Depending on the local_link_kind configuration, relative local links are converted into absolute local links and eventually rebased.

In order to achieve this, the user must respect the following convention concerning absolute local links in Tp-Note documents: When a document contains a local link with an absolute path (absolute local link), the base of this path is considered to be the directory where the marker file ‘.tpnote.toml’ resides (or ‘/’ in non exists). The marker file directory is root_path. Furthermore, the parameter docdir contains the absolute path of the directory of the currently processed HTML document. The user guarantees that docdir is the base for all relative local links in the document. BTW: docdir must always start with root_path.

If LocalLinkKind::Off, relative local links are not converted. If LocalLinkKind::Short, relative local links are converted into an absolute local links with root_path as base directory. If LocalLinkKind::Long, in addition to the above, the resulting absolute local link is prepended with root_path.

If rewrite_ext is true and a local link points to a known Tp-Note file extension, then .html is appended to the converted link.

Remark: The link’s text property is never changed. However, there is one exception: when the link’s text contains a string similar to URLs, starting with http: or tpnote:. In this case, the string is interpreted as URL and only the stem of the filename is displayed, e.g. <a ...>http:dir/my file.md</a> is replaced with <a ...>my file</a>.

Finally, before a converted local link is reinserted in the output HTML, a copy of that link is kept in allowed_local_links for further bookkeeping.

NB: All absolute URLs (starting with a domain) always remain untouched.

NB2: It is guaranteed, that the resulting HTML document contains only local links to other documents within root_path. Deviant links displayed as INVALID LOCAL LINK and URL is discarded.