Add doi2bib.r wrapper

ChangeLog

@@ -1,3 +1,7 @@
+2024-03-13  Dirk Eddelbuettel  <edd@debian.org>
+
+	* inst/examples/doi2bib.r: New wrapper for DOI request for bibtex entry
+
 2024-03-11  Dirk Eddelbuettel  <edd@debian.org>
 
 	* DESCRIPTION (Date, Version): Roll micro version and date

inst/examples/doi2bib.r

@@ -0,0 +1,35 @@
+#!/usr/bin/env r
+##
+##  Convert a DOI to it bibtext field
+##
+##  Copyright (C) 2024  Dirk Eddelbuettel
+##
+##  Released under GPL (>= 2)
+##
+##  With thanks to https://bsky.app/profile/rmcelreath.bsky.social/post/3knkqvogwbc25
+
+## load docopt package from CRAN
+library(docopt)
+library(httr)
+
+## configuration for docopt
+doc <- "Usage: doi2bib.r [-h] [-x] DOI
+
+-h --help             show this help text
+-x --usage            show help and short example usage"
+
+opt <- docopt(doc)          # docopt parsing
+
+if (opt$usage) {
+    cat(doc, "\n\n")
+    cat("Examples:
+  doi2bib..r 10.1002/evan.10110
+
+doi2bib.r is part of littler which brings 'r' to the command-line.
+See http://dirk.eddelbuettel.com/code/littler.html for more information.\n")
+    q("no")
+}
+
+res <- GET(paste0("https://doi.org/", opt$DOI),
+           add_headers(Accept="application/x-bibtex"))
+cat(rawToChar(res$content))