[obsidian.md] user script for finding the previous daily note and updating its Next link too.

obsidianmd_templater_previousnextfix.txt

function ctimeComparer(a, b) 
{
    if (a.stat.ctime < b.stat.ctime) {
        return 1;
    } else if (a.stat.ctime > b.stat.ctime) {
        return -1;
    }
    // a must be equal to b
    return 0;
}

async function find_last_daily_note (tp) {
    today = null;
    last_created = null;

    const daily_folder = "Daily Notes/";

    const dailies = app.vault.getMarkdownFiles().filter(file=>
        {
            return file.path.startsWith(daily_folder)
            && file.basename != tp.file.title;
        });

    if(dailies.length > 0)
    {
        //Sorts with newest in 0 index
        dailies.sort(ctimeComparer);

        //First element is the previous daily
        last_created = dailies[0];
        //Get its metadata
        const last_created_metadata = app.metadataCache.getFileCache(last_created);
        //Get its links to other files
        const last_created_links = last_created_metadata?.links;
        
        if(last_created_links && last_created_links.length > 0)
        {
            //Find the link that has the Next > display text
            last_created_next_link = last_created_links.find(x=> x.displayText.includes("Next >"));

            if(last_created_next_link){
                //Generate a link to the newly created daily (today's) with the same display text
                const new_link = app.fileManager.generateMarkdownLink(tp.config.target_file, tp.config.target_file.path, null, "Next >");

                try {
                    app.vault.process(last_created, (data) => {
                        //console.log("Replacing " + last_created_next_link.original + " with " + new_link);
                        return data.replace(last_created_next_link.original, new_link);
                    })
                } catch (e) {
                    console.error(e);
                    throw e;
                }
            }
        }
        return last_created.basename;
    }
    return tp.date.yesterday("YYYY-MM-DD");
}
module.exports = find_last_daily_note;