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modules/home/users/crumb/emacs/snippets/bibtex-mode/.yas-setup.el

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+;;; .yas-setup.el -*- lexical-binding: t; -*-
+
+(require 'dash)
+(require 's)
+
+(defun snippet-bibtex--make-id ()
+  (let ((surname (--> (or (yas-field-value 2)
+                          "surname")
+                      (s-downcase it)
+                      (string-to-list it)
+                      (-take-while (lambda (x) (/= x ?,)) it)
+                      (-filter (lambda (x) (not (memq x '(?- ?\s)))) it)
+                      (apply #'string it)))
+        (year (--> (or (yas-field-value 3)
+                       "1234")
+                   (string-to-list it)
+                   (-take-while (lambda (x) (<= ?0 x ?9)) it)
+                   (apply #'string it)))
+        (keyword (or (-some--> (or (yas-field-value 1)
+                                   "keyword")
+                       (s-downcase it)
+                       (s-split-words it)
+                       (-find (lambda (x)
+                                (not (member x '("the" "on" "of" "a" "when"))))
+                              it))
+                     "keyword")))
+    (concat surname year keyword)))

modules/home/users/crumb/emacs/snippets/bibtex-mode/@art

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+# -*- mode: snippet -*-
+# name: Article
+# uuid:
+# key: @art
+# condition: t
+# --
+@article{${1:$(snippet-bibtex--make-id)}
+, title   = {${1:Principia Mathematica}}
+, author  = {${2:of Sinope, Diogenes}}
+, year    = {${3:1992}}
+, url     = {${4:https://example.com/}}
+, urldate = {${5:`(format-time-string "%Y-%m-%d")`}}
+}