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220 lines
4.9 KiB
Lua
220 lines
4.9 KiB
Lua
local M = {}
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local fn = vim.fn
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local config = require('zettelkasten.config')
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local ZK_FULL_TITLE_PATTERN = '# %d+-%d+-%d+-%d+-%d+-%d+ .+'
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local ZK_ID_PATTERN = '%d+-%d+-%d+-%d+-%d+-%d+'
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local ZK_FILE_NAME_PATTERN = '%d+-%d+-%d+-%d+-%d+-%d+.md'
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local s_note_cache_with_file_path = {}
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local s_note_cache_with_id = {}
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local function get_files(folder)
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local files = fn.split(fn.globpath(folder, '*.md'), '\\n')
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files = vim.tbl_filter(function(file)
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return string.match(file, ZK_FILE_NAME_PATTERN) ~= nil
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end, files)
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return files
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end
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local function extract_id_and_title(line)
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local zk_id = string.match(line, ZK_FULL_TITLE_PATTERN)
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if zk_id == nil then
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return nil
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end
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zk_id = string.gsub(zk_id, '# ', '')
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local note_id = string.match(zk_id, ZK_ID_PATTERN)
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local title = vim.trim(string.gsub(zk_id, ZK_ID_PATTERN, ''))
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return { id = note_id, title = string.gsub(title, '\r', '') }
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end
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local function extract_references(line, linenr)
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assert(line ~= nil)
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local references = {}
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for ref in string.gmatch(line, '(%[%[' .. ZK_ID_PATTERN .. '%]%])') do
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ref = string.gsub(ref, '%[%[', '')
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ref = string.gsub(ref, '%]%]', '')
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table.insert(references, { id = ref, linenr = linenr })
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end
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return references
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end
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local function extract_back_references(notes, note_id)
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assert(note_id ~= nil)
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local back_references = {}
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for _, note in ipairs(notes) do
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if note.id == note_id then
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goto continue
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end
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local references = note.references
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for _, ref in ipairs(references) do
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if ref.id == note_id then
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table.insert(back_references, {
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id = note.id,
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title = note.title,
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file_name = note.file_name,
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linenr = ref.linenr,
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})
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break
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end
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end
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::continue::
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end
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return back_references
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end
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local function extract_tags(line, linenr)
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assert(line ~= nil)
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local tags = {}
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for tag in string.gmatch(line, '(%#%a[%w-]+)') do
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local start_pos, _ = string.find(line, tag, 1, true)
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local previous_char = string.sub(line, start_pos - 1, start_pos - 1)
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if previous_char == '' or previous_char == ' ' then
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table.insert(tags, { linenr = linenr, name = tag })
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end
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end
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return tags
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end
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local function get_note_information(file_path)
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local last_modified = fn.strftime('%Y-%m-%d.%H:%M:%S', fn.getftime(file_path))
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if
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s_note_cache_with_file_path[file_path] ~= nil
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and s_note_cache_with_file_path[file_path].last_modified == last_modified
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then
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return s_note_cache_with_file_path[file_path]
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end
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local file = io.open(file_path, 'r')
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if file:read(0) == nil then
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return nil
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end
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local info = {
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id = '',
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title = '',
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file_name = file_path,
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last_modified = last_modified,
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tags = {},
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references = {},
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back_references = {},
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}
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local linenr = 0
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while true do
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linenr = linenr + 1
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local line = file:read('*line')
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if line == nil then
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break
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end
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if line == '' then
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goto continue
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end
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if info.id == '' then
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local id_title = extract_id_and_title(line)
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if id_title then
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info = vim.tbl_extend('force', info, id_title)
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goto continue
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end
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end
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local refs = extract_references(line, linenr)
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if refs then
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vim.list_extend(info.references, refs)
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end
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local tags = extract_tags(line, linenr)
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if tags then
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vim.list_extend(info.tags, tags)
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end
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::continue::
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end
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if info.id ~= nil then
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s_note_cache_with_file_path[file_path] = info
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s_note_cache_with_id[info.id] = info
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end
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return info
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end
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function M.get_note(id)
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if s_note_cache_with_id[id] ~= nil then
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return s_note_cache_with_id[id]
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end
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local _ = M.get_notes()
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if s_note_cache_with_id[id] ~= nil then
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return s_note_cache_with_id[id]
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end
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return nil
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end
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function M.get_notes()
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local folder = config.zettel_dir
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local files = get_files(folder)
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local all_notes = {}
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for _, file in ipairs(files) do
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table.insert(all_notes, get_note_information(file))
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end
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for _, note in ipairs(all_notes) do
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if note.id == nil then
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goto continue
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end
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local back_references = extract_back_references(all_notes, note.id)
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if back_references then
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-- When notes are cached, `back_references` field will have the references from before.
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-- Since the files that refer to this one might have changed, we'll overwrite it here.
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-- extract_back_references() already re-processes the references.
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note.back_references = back_references
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end
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::continue::
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end
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return all_notes
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end
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function M.get_tags()
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local notes = M.get_notes()
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local tags = {}
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for _, note in ipairs(notes) do
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if #note.tags == 0 then
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goto continue
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end
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for _, tag in ipairs(note.tags) do
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table.insert(tags, {
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linenr = tag.linenr,
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name = tag.name,
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file_name = note.file_name,
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})
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end
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::continue::
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end
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return tags
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end
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return M
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