221 lines
7.2 KiB
EmacsLisp
221 lines
7.2 KiB
EmacsLisp
;;; um.el --- An Ultralight database for Markdown composition. -*- lexical-binding: t -*-
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;; by bth
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;; Um is an ultralight database design and emacs toolkit for organizing writing
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;; into larger compositions. It uses only unique filenames, POSIX filesystem
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;; conventions, the builtin `project' package, and standard POSIX commandline
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;; tools to build out the CLI.
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;; It consists of two parts:
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;; 1. The elisp for functionality within emacs.
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;; 2. Bash scripts for the commandline interface.
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;; This is somewhat like org-roam, except without any database dependency. (And
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;; it assumes Markdown rather than org, which I don't care for.)
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;; This depends on a few simple ideas:
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;; 1. A numbered filename specification which serves as unique id.
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;; 2. Placing that same id into the file header, so that concatenated files
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;; have reference back to their source. See the `um cat` command.
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;; 3. Using a source "journal/" directory, where source files should first be
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;; composed and where we can assume a file exists if not elsewhere.
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;; 4. Using the built-in `project' package to organize compositions built from
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;; these source files.
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;; features provided:
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;; `um-journal-find-file' via `find-file': open a file under point in the
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;; current project, falling back to a source directory.
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;; `um-file-at-point-advice' via `embark-dwim': open file under point in all
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;; known projects, falling back to a source directory.
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;; `um-grep-tag': search files with same tag
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(require 'project)
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(defvar um-journal-path-glob ".*/writing/journal"
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"Primary path glob for the journal. This allows various mountpoints.")
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(defvar um-date-format "%Y-%m-%d"
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"Format passed to `format-time-string' when creating `um-journal-header'. Defaults to ISO8601.")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; journal header
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;;;###autoload
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(defun um-journal-header ()
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"Create a header composed of:
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# filename
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: date
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"
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(interactive)
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(insert
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(format "# %s\n: %s\n\n" (buffer-name) (format-time-string um-date-format))
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))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; find-file-at-point
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;; the journal/ serves as content origin, so it must be treated specially.
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(defun um-journal-path()
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(or (car (seq-filter
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(lambda (path)
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;; this way I don't have to hardcode the full path:
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(string-match um-journal-path-glob path))
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;; stores all project roots in a list of strings:
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(project-known-project-roots)))
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;; fallback if not found
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default-directory
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))
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;;;;;;;;;;;;;;;;;;;;;
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;; find-file C-x C-f solution
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;; combined with the hook into `file-name-at-point-functions', this means I can
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;; run find-file at point, followed by M-n :
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;; Load like this:
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;; (add-hook 'file-name-at-point-functions 'um-journal-find-file)
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;;
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;; TODO: reuse same fallback logic as the embark advice if I keep this.
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;;;###autoload
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(defun um-journal-find-file ()
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(let ((default-directory (um-journal-path))
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(thing (thing-at-point 'filename))
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)
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(expand-file-name thing))
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)
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;;;;;;;;;;;;;;;;;;
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;; Embark solution
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;; Load this with an advice:
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;; (advice-add 'embark-target-file-at-point :around 'um-file-at-point-advice)
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;; `embark-target-file-at-point' uses `ffap-file-at-point', which uses
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;; `default-directory' to expand the filename.
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;; NOTE: decided to use an advice rather than add my own function to
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;; `embark-target-finders', since I'd have to remove the file finder and put my
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;; function in the same place in the list anyway.
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;;;###autoload
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(defun um-file-at-point-advice (origfunc)
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"Like find-file-at-point, but checks all known project paths.
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In this order:
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1. current project root
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2. all subdirectories in current project
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3. all other project roots
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4. journal/ path
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Since journal/ is the origin and other projects shadow it.
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"
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(or
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;; current project
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(funcall origfunc)
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;; NOTE: Recurse down into current project directories.
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;; project-find-file does it fine, just don't want interactive
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;; completing-read call.
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(when (project-current)
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(let ((result) (tap (thing-at-point 'filename t)))
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;; TODO: this is procedural thinking and not lisp-like:
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(cl-loop for file in
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(project-files (project-current))
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do (let ((basename (file-name-nondirectory file)))
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(setq result (equal tap basename)))
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if result
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;; see `embark-target-finders':
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return (cons 'file file)
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)))
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;; all other projects
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(let ((result))
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(cl-loop for project-path in
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(seq-remove
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(lambda (path)
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(or (string-match (um-journal-path) path)
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(when (project-current)
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(string-match (caddr (project-current)) path))
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))
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(project-known-project-roots))
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do (let ((default-directory project-path))
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(setq result (funcall origfunc)))
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if result
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return result
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))
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;; journal path
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(let ((default-directory (um-journal-path)))
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(funcall origfunc))
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))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; tags
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;; TODO: do I want to search all projects?
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(defun um-grep-tag ()
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"Run project-find-regexp on the current identifer as a journal frontmatter tag.
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NOTE: this searches in the current project root only.
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"
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(interactive)
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(project-find-regexp (concat "^\\+ " (thing-at-point 'word) "$"))
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)
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;; NOTE: to export files with a given tag:
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;; grep -l '\+ TAG' *md | xargs cp -t /tmp/
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;; note the -l flag to grep to output files only, and the -t flag to cp to
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;; specify a target dir (since it appends the list from xargs I think).
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;; Or, in dired, run `find-grep-dired'.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; shell integration
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;;;###autoload
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(defun um-next (next-file &optional tags skip-header)
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"Takes the next-file generated by the shell script and opens it.
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Optional TAGS string may contain more than one tag separated by a comma.
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The SKIP-HEADER option says not to insert the um-journal-header at all,
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in which case TAGS is also ignored.
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"
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(find-file next-file)
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(unless skip-header
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(um-journal-header)
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(if tags
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(progn (forward-line -1)
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(dolist (tag (split-string tags ","))
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(insert (format "+ %s\n"
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(if (equal "+" tag)
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(cadr (split-string next-file "\\."))
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tag))))
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(forward-line))))
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(message (format "creating %s" next-file))
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)
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(defun um-next-shell (dir &optional descriptor skip-header)
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"Calls um next in the provided dir.
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With the option not to leave behind the um-journal-header.
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Returns the value of next-file computed by um next
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"
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(let ((default-directory dir) (next-file))
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;; https://emacs.stackexchange.com/a/19878
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(setq next-file (shell-command-to-string
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(concat "export UMNEXTPRINT=true; um next"
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(concat " " descriptor))))
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(um-next next-file nil skip-header)
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next-file
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)
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)
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(provide 'um)
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