commit 5e1b2ac657e6ac684f3f74ba6bdbacb9c3f55b19
Author: bth <git@bth.moi>
Date:   Thu Jan 11 10:52:52 2024 -0800

    init

diff --git a/bash/last/last.sh b/bash/last/last.sh
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+# Get the last file name of any numbered series of text files.
+
+# file format:
+# in regex terms:
+#   [0-9]+\.[.*\.]*md|txt
+# in plain terms:
+#   [leading numbers with consistent width].[optional string descriptor and . separator][md|txt]
+
+ls | egrep '^\d.*\.md|txt' | tail -n 1
diff --git a/bash/last/test/001.md b/bash/last/test/001.md
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diff --git a/bash/last/test/002.blah.md b/bash/last/test/002.blah.md
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diff --git a/bash/last/test/004.foo.md b/bash/last/test/004.foo.md
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diff --git a/bash/last/test/005.md b/bash/last/test/005.md
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diff --git a/bash/last/test/009.boo.md b/bash/last/test/009.boo.md
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diff --git a/bash/last/test/098.baa.md b/bash/last/test/098.baa.md
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diff --git a/bash/last/test/099.poo.md b/bash/last/test/099.poo.md
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diff --git a/bash/mdcat/mdcat.sh b/bash/mdcat/mdcat.sh
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+++ b/bash/mdcat/mdcat.sh
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+# cat for Markdown in my ultralight writing database
+# wherein concatenated filed need a "\n---\n\n" between them.
+
+#############################################################################
+# cat with file headers | replace with section string | remove first instance
+
+# NOTE: only need to add one newline, because the header inserted by tail
+# implicitly adds two : \n==> foo <==\n
+tail -n +1 "$@" | sed 's/^==> .* <==$/---\n/g' | tail -n +3
+
+
+##############################
+# failed approaches
+
+# find . -type f -name "$@" -exec cat {} \; -printf "\n---\n\n"
+
+# this leaves one trailing, could cat the whole thing and then cut the tail off
+# MDCATALL=`for i in "$@";
+# do
+#     cat $i
+#     echo '\n---\n\n'
+# done`
+# echo $MDCATALL | head -n +2
diff --git a/bash/next/args.sh b/bash/next/args.sh
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+++ b/bash/next/args.sh
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+# why can't i use bash if statement, before appending an empty arg string?
+
+last=`ls | egrep '^\d.*\.md|txt' | tail -n 1`
+
+if ($* != "")
+    last=last + $*;
+
+awk '
+{
+print $0
+}
+END {print NR}' last
diff --git a/bash/next/emacs_script.sh b/bash/next/emacs_script.sh
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+++ b/bash/next/emacs_script.sh
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+# emacs --debug-init blah
+emacs `ls | grep '^\d' | tail -n 1`
diff --git a/bash/next/next.sh b/bash/next/next.sh
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+++ b/bash/next/next.sh
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+# Get the file name in any numbered series of text files and open with emacs
+
+# Usage:
+#     $ . next [descriptor]
+
+# Handles an optional string descriptor. Like this:
+#    $ ls
+#    011.blah.md
+#    $ . next foo
+#    012.foo.md
+
+# File format:
+# in regex terms:
+#   [0-9]+\.[.*\.]*md|txt
+# in plain terms:
+#   [leadings numbers with consistent width].[optional string descriptor and . separator][md|txt]
+
+# what this does:
+# ls | grep [regex for number.*.md] | get last | awk script to increment the digits, preserve the zero prefix, add string descriptor if supplied, and add back extension
+
+# Note the egrep '^\d.*\.md|txt' (matches whole string) to account for an optional string between the initial number and the file extension. As in '435.blah.md'.
+
+# old version, relied on python, which didn't handle leading zeros properly, but treated them as binary:
+# ls | grep '\d.*\.md' | tail -n 1 | sed s/'\..*md'// | sed s/.*/'print & + 1'/ | python - | sed s/.*/'&.md/'
+
+# BUGS
+
+# 1. Emacs won't accept piped input as a file name. I'd rather keep this as a separate utility, which only printed the right filename, and then use an alias to pipe the filename to emacs, or invoke it manually.
+
+# A.
+# What I want, is this syntax:
+# next [optional arg]
+# To both get the file and open emacs with it.
+
+# B.
+# But this doesn't work:
+# next | emacs
+# Because it sees the stdin the pipe wants to feed it as a substitute for the tty in the new session, rather than as input for startup only, i.e. the filename.
+
+# C.
+# Wrapping the whole shell command here works, like this:
+# emacs `ls | grep ...`
+
+# But emacs doesn't like being run inside a child level shell, because it can't load .emacs properly. So you must run this file within the current shell using ".", like this:
+# . next
+# . next foo
+
+# D.
+# This does not work, because .profile must be executed, meaning that the "" expression is peeked by the shell:
+# alias next="emacs `next.sh $1`"
+
+# E.
+# This does not work either, because the arg never gets filled out when evoked:
+# alias next='emacs `next.sh $1`'
+
+# F.
+# This works and is the current solution:
+# alias next='. next.sh'
+
+# Which relies on 2 somewhat obscured facts:
+# 1. This script calls emacs itself, wrapping the real work in ``
+# 2. The alias is a simple substitution, which fortunately seems to happen before args are processed by the shell, meaning that the shell sees: ". next.sh arg"
+# 3. NOTE: the symbolic link in the PATH should not be simply "next", because it
+# may in certain situations conflict with the alias. The link should be "next.sh" -> ~/config/..
+# 4. NOTE: I use 'e' rather than 'emacs', to use my clever emacs/emacsclient function.
+
+e `
+
+ls | egrep '^[[:digit:]].*\.md|txt' | tail -n 1 | awk '
+
+BEGIN {
+# set field separator, blank by default
+FS = "."
+}
+
+{
+newnum = $1 + 1
+nzeros = length($1) - length(int(newnum))
+
+# could I do this with a simpler regex to select all leading zeros?
+leadingzeros = ""
+if (nzeros > 0)
+  for (i = 1; i <= nzeros; i++)
+    leadingzeros = sprintf("%s%s", leadingzeros, "0")
+
+if (nzeros > 0)
+  newnum = sprintf("%s%s", leadingzeros, newnum)
+
+# start by prefixing the number, now with leading zeros
+finalstr = newnum
+
+# allow an arg input to fill out descriptor string.
+# single quote break to allow the shell to fill it out, double quotes so awk will treat it as a string
+arg = "'$1'"
+
+if (arg != "")
+    finalstr = sprintf("%s.%s", finalstr, arg)
+
+# append last field by default
+finalstr = sprintf("%s.%s", finalstr, $NF)
+
+# previous loop to reassemble all fields. But I do not want the old middle string here
+# Keeping it here for reference.
+# for (i = 2; i <= NF; i++)
+#   finalstr = sprintf("%s.%s", finalstr, $i)
+# }
+
+}
+
+END {
+print finalstr
+}'
+`
diff --git a/bash/next/test/001.md b/bash/next/test/001.md
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diff --git a/bash/next/test/002.blah.md b/bash/next/test/002.blah.md
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diff --git a/bash/next/test/004.foo.md b/bash/next/test/004.foo.md
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diff --git a/bash/next/test/005.md b/bash/next/test/005.md
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diff --git a/bash/next/test/009.boo.md b/bash/next/test/009.boo.md
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diff --git a/bash/next/test/098.baa.md b/bash/next/test/098.baa.md
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diff --git a/bash/next/test/099.poo.md b/bash/next/test/099.poo.md
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diff --git a/bash/rename/rename.sh b/bash/rename/rename.sh
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+++ b/bash/rename/rename.sh
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+# rename : renames the string descriptor used in numbered series.
+
+# Usage:
+
+# > rename 100.md bar
+# or
+# > rename 100.foo.md bar
+
+# is equivalent to:
+# > mv 100.md 100.bar.md
+# > mv 100.foo.md 100.bar.md
+
+# split the args by a newline so that awk reads them as separate "records"
+mvcmd=`echo "$1
+$2" |
+awk '
+BEGIN {
+  # Builtin variable, "field seperator". The neatness of this is the main reason
+  # I use awk to parse the filename.
+  FS="."
+  oldname = ""
+  num = ""
+  ext = ""
+  newname = ""
+}
+
+NR == 1 {
+  oldname = $0
+  num = $1
+  # important that this is the last field, not numbered, to allow for a file
+  # without a string descriptor.
+  ext = $NF
+}
+
+NR == 2 {
+  newname = sprintf("%s.%s.%s", num, $0, ext)
+}
+
+END {
+  print oldname, newname
+}
+'`
+mv $mvcmd
diff --git a/bash/rename/test/001.bar.txt b/bash/rename/test/001.bar.txt
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diff --git a/bash/rename/test/06.foo.md b/bash/rename/test/06.foo.md
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diff --git a/bash/rename/test/07.blah.txt b/bash/rename/test/07.blah.txt
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diff --git a/bash/rename/test/100.foo.md b/bash/rename/test/100.foo.md
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diff --git a/bash/rename/test/245.blah_foo.md b/bash/rename/test/245.blah_foo.md
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diff --git a/uldb.el b/uldb.el
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+++ b/uldb.el
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+;;; uldb.el --- An ultralight database for composition. -*- lexical-binding: t -*-
+
+;; by bth
+
+;; An ultralight database for writing and project composition, using only unique
+;; filenames, POSIX filesystem conventions, and the builtin `project' package.
+
+;; This is somewhat like org-roam, except without any database dependency. (And
+;; it uses Markdown rather than org, which I don't care for.)
+
+;; This depends on a few simple ideas:
+
+;; 1. A numbered filename specification which serves as unique id.
+
+;; 2. Placing that same id into the file header, so that concatenated files
+;; have reference back to their source.
+
+;; 3. Using a source "journal/" directory, where source files should first be
+;; composed and where we can assume a file exists if not elsewhere.
+
+;; 4. Using the built-in `project' package to organize compositions built from
+;; these source files.
+
+;; 5. (Optional) Use `embark' to visit files with a single keystroke.
+
+;; features provided:
+;; `uldb-journal-header' defines the standard header
+
+;; `uldb-project-find-meta' via `project-switch-project': open a file like
+;; *meta.md in a given project.
+
+;; `uldb-file-at-point-advice' via `embark-dwim': open file in known projects
+;; with fallback to journal/
+
+;; `uldb-grep-tag': search files with same tag
+
+(require 'package)
+
+;; Primary path glob for the journal. This allows various mountpoints.
+
+(setq uldb-journal-path-glob ".*/writing/journal")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; journal header
+
+(defun uldb-iso-8601 ()
+  "Insert a date stamp in ISO 8601 order, but with periods in place of dashes."
+  (format-time-string "%Y.%m.%d")
+  )
+
+(defun uldb-journal-header ()
+  "Create a uldb-journal header composed of:
+# buffer-name minus the .md file type
+: date
+"
+   (interactive)
+   (insert
+    (format "# %s\n: %s\n\n" (substring (buffer-name) 0 -3) (uldb-iso-8601))
+    )
+   )
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; journal/.project.el
+
+;; normally .git detection works fine. But for my journal/ I don't git.
+;; https://michael.stapelberg.ch/posts/2021-04-02-emacs-project-override/
+(defun uldb-project-override (dir)
+    "Returns the parent directory containing a .project.el file,
+ if any, to override the standard project.el detection logic when
+ needed.
+"
+    (let ((override (locate-dominating-file dir ".project.el")))
+      (if override
+          (list 'vc nil override)
+        nil)))
+;; Cannot use :hook because 'project-find-functions does not end in -hook
+(add-hook 'project-find-functions #'uldb-project-override)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; find-file-at-point
+
+;; the journal/ serves as content origin, so it must be treated specially.
+(setq uldb-journal-path (car (seq-filter
+                         (lambda (path)
+                           ;; this way I don't have to hardcode the full path:
+                           (string-match uldb-journal-path-glob path))
+                         ;; stores all project roots in a list of strings:
+                         (project-known-project-roots))))
+
+;;;;;;;;;;;;;;;;;;;;;
+;; find-file C-x C-f solution
+;; combined with the hook into `file-name-at-point-functions', this means I can
+;; run find-file at point, followed by M-n :
+(defun uldb-journal-find-file ()
+  (let ((default-directory uldb-journal-path)
+        (thing (thing-at-point 'filename))
+        )
+    (expand-file-name thing))
+)
+(add-hook 'file-name-at-point-functions 'uldb-journal-find-file nil t)
+
+;;;;;;;;;;;;;;;;;;
+;; Embark solution (optional)
+
+;; Load this with an advice:
+;; (advice-add 'embark-target-file-at-point :around 'uldb-file-at-point-advice)
+
+;; `embark-target-file-at-point' uses `ffap-file-at-point', which uses
+;; `default-directory' to expand the filename.
+
+;; NOTE: decided to use an advice rather than add my own function to
+;; `embark-target-finders', since I'd have to remove the file finder and put my
+;; function in the same place in the list anyway.
+
+(defun uldb-file-at-point-advice (origfunc)
+  "Like find-file-at-point, but checks all known project paths.
+
+In this order:
+1. current project root
+2. all other project roots
+3. journal/ path
+
+Since journal/ is the origin and other projects shadow it.
+
+TODO: Use a special directory name for potentials/ or the like, in case it's not
+in the root dir.
+"
+  (or
+   ;; current project
+   (funcall origfunc)
+
+   ;; all other projects
+   (let ((result))
+     (cl-loop for project-path in
+              (seq-remove
+               (lambda (path)
+                 (or (string-match uldb-journal-path path)
+                     (when (project-current)
+                       (string-match (caddr (project-current)) path))
+                     ))
+               (project-known-project-roots))
+              do (let ((default-directory project-path))
+                   (setq result (funcall origfunc)))
+              if result
+              return result
+              ))
+
+   ;; journal path
+   (let ((default-directory uldb-journal-path))
+     (funcall origfunc))
+   ))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; C-x p p
+
+(defun uldb-project-find-meta ()
+  (interactive)
+  ;; this works because `project-switch-project' overrides the dir:
+  (find-file (expand-file-name "*meta.md" (caddr (project-current))) t)
+  )
+
+;; overwrite
+(setq project-switch-commands
+      '(
+        (uldb-project-find-meta "open meta" "m")
+        (project-dired "dired")
+        (project-find-file "find file")
+        (project-find-regexp "find regexp")
+        ))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; tags
+
+;; TODO: do I want to search all projects?
+(defun uldb-grep-tag ()
+  "Run project-find-regexp on the current identifer as a journal frontmatter tag.
+
+NOTE: this searches in the current project root only.
+"
+  (interactive)
+  (project-find-regexp (concat "\\+\\ " (thing-at-point 'word)))
+  )
+
+;; NOTE: to export files with a given tag:
+;; grep -l '\+ TAG' *md | xargs cp -t /tmp/
+;; note the -l flag to grep to output files only, and the -t flag to cp to
+;; specify a target dir (since it appends the list from xargs I think).
+;; Or, in dired, run `find-grep-dired'.
+
+
+(provide 'uldb)