v0.9.0

Added

• inputPreset and outputPreset conversion options: the dialect the
  input is read in and the one the output is written in, Vanilla when
  left out (ADR 0006). preset still sets both, leaving a side Vanilla
  whose format it has no dialect for; a side preset without one throws,
  as does preset together with another side preset, and normalize*
  with different presets per side.
• --input-preset / --output-preset and inputPreset /
  outputPreset in morg.toml, and the preset name vanilla. Each
  side resolves on its own: side flag, --preset, side key, preset;
  preset next to a different side preset in one place is an error.
• Logseq org → Vanilla Markdown (--input-preset logseq): blocks become
  a nested list, a heading block a heading whose children start a new
  list, numbered blocks an ordered list. Task markers render as Logseq
  shows them (- [ ], - [x], - [ ] LATER …); planning and
  properties become key:: value lines in the item, under the
  orgismKeys names; collapsed and drawers are dropped with a
  warning. A block's title stays inline text, as Logseq reads it, even
  where it looks like org line syntax (: a, - a). After a heading
  block, Markdown has no way back to the top level, so a later
  top-level block reads back as the heading's child. Logseq's inline
  syntax is carried as Logseq Markdown writes it, as text a return trip
  restores: page and block refs
  ([[Page]], [label]([[Page]])), macros ({{video …}}), tags,
  priorities, hiccup, highlights; a query block becomes a query code
  block.
• Vanilla Markdown → Logseq org (--output-preset logseq), as Logseq
  reads a file it did not write: a list item is a block, its nested
  list its children; a heading is a block nesting by level, the text
  below it its content; other text after a list a block of its own.
  Task items, key:: value lines and ordered lists come back as task
  markers, planning, properties and numbered blocks. Reference links
  become inline before the page splits into blocks, and a footnote's
  definition moves to the block of its first reference. Logseq's syntax
  carried in Vanilla Markdown (page and block refs, macros, a query
  code block) is Logseq's again.
• Logseq Markdown ↔ Vanilla org: Vanilla org is read and written as
  Logseq org, which it is, page properties as leading keywords.
• Logseq page properties ↔ plain Vanilla Markdown frontmatter
  (title: P), as Markdown tools read metadata; a keyword that acts in
  Emacs stays in morg_keywords.
• Web UI: an Input and an Output select, each naming a format and its
  dialect (Org, Org (Logseq), Markdown, Markdown (Logseq), Markdown
  (Obsidian)), above their text areas, replace the direction and preset
  selects. The direction follows from the two; the same on both sides
  normalizes, and says so; a dialect change within one format is not
  offered; ⇄ swaps the sides. The demo follows the input; sides
  remembered by 0.8.0 are restored.
• Obsidian ↔ Logseq: an Obsidian wikilink and a Logseq page ref map
  onto each other ([[Page|label]] ↔ [[Page][label]]).

Changed

• Breaking. A FragmentConverter takes a third argument, the
  preset whose syntax a Vanilla side carries. Preset.convertOrg and
  Preset.convertMarkdown get a third argument, the conversion's
  context (exported as ConversionContext): the side the preset is on
  (both, input or output), onWarning and orgismKeys.
• Breaking. Preset holds one dialect per format, each read in
  one direction and written in the other (ADR 0006):
  markdown: { read: { mdast, org }, write } and
  org: { read, write }, typed MarkdownDialect and OrgDialect.
  applyToMdast, applyToUniorg and extractFromUniorg are gone. The
  built-in presets convert as before.