diff --git a/.local/bin/getbib b/.local/bin/getbib
index 121dd6ee..d9830ca1 100755
--- a/.local/bin/getbib
+++ b/.local/bin/getbib
@@ -1,14 +1,76 @@
-#!/bin/sh
-[ -z "$1" ] && echo "Give either a pdf file or a DOI as an argument." && exit
+#!/bin/dash
 
-if [ -f "$1" ]; then
-	# Try to get DOI from pdfinfo or pdftotext output.
-	doi=$(pdfinfo "$1" | grep -io "doi:.*") ||
-	doi=$(pdftotext "$1" 2>/dev/null - | sed -n '/[dD][oO][iI]:/{s/.*[dD][oO][iI]:\s*\(\S\+[[:alnum:]]\).*/\1/p;q}') ||
-	exit 1
-else
-	doi="$1"
-fi
+BIB_FILE="$HOME/latex/uni.bib"
 
-# Check crossref.org for the bib citation.
-curl -s "https://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n"
+correction_method() {
+    sed -n -E 's/.*((DOI|doi)((\.(org))?\/?|:? *))([^: ]+[^ .]).*/doi:\6/p; T; q'
+}
+
+get_doi_from_pdf() {
+    pdf="$1"
+    doi=$(pdfinfo "$pdf" 2>/dev/null | correction_method)
+    [ -z "$doi" ] && doi=$(pdftotext -q -l 2 "$pdf" - 2>/dev/null | correction_method)
+    [ -z "$doi" ] && echo "No DOI found for PDF: $pdf" >&2 && return 1
+    echo "$doi"
+}
+
+correct_names() {
+    sed '/^@[a-z]\+{[^[:space:]]\+[0-9]\{4\},/{
+    s/\([A-Z]\)/\L\1/g
+    s/_//g
+    s/[0-9]*\([0-9]\{2\}\)/\1/g
+  }'
+}
+
+normalize_doi() {
+    doi="$1"
+    doi=$(echo "$doi" | sed 's@%@\\x@g' | xargs -I {} printf "%b" "{}")
+    printf "%s" "$doi" | tr 'A-Z' 'a-z'
+}
+
+process_doi() {
+    doi="$1"
+    bibtex_entry=$(curl -s "https://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n" | correct_names)
+    red_color='\033[0;31m'
+    reset_color='\033[0m'
+
+    printf "${red_color}%s${reset_color}\n" "$bibtex_entry"
+    [ -z "$bibtex_entry" ] && [ "$(echo "$bibtex_entry" | cut -c2)" != "@" ] && echo "Failed to fetch bibtex entry for DOI: $doi" && return 1
+
+    normalized_doi="${doi#doi:}"
+    grep -q -E "doi\s*=\s*\{$(echo "$normalized_doi" | sed 's/(/\\(/g')\}" "$BIB_FILE" || {
+        [ -s "$BIB_FILE" ] && echo "" >> "$BIB_FILE"
+        echo "$bibtex_entry" >> "$BIB_FILE"
+        echo "Added bibtex entry for DOI: $doi"
+        return 1
+    }
+    echo "Bibtex entry for DOI: $doi already exists in the file."
+}
+
+[ -z "$1" ] && echo "Give either a pdf file or a DOI or a directory path that has PDFs as an argument." && exit 1
+
+[ -d "$1" ] && {
+    for pdf in "$1"/*.pdf; do
+        doi=$(get_doi_from_pdf "$pdf")
+        [ -n "$doi" ] && {
+            doi=$(normalize_doi "$doi")
+            process_doi "$doi"
+        }
+    done
+    exit 1
+}
+
+[ -f "$1" ] && [ "$(echo "$1" | grep -c "\.pdf$")" -ne 0 ] && {
+    doi=$(get_doi_from_pdf "$1")
+    [ -n "$doi" ] && {
+        doi=$(normalize_doi "$doi")
+        process_doi "$doi"
+    }
+    exit 1
+}
+
+doi=$(echo "$1" | correction_method)
+[ -n "$doi" ] && {
+    doi=$(normalize_doi "$doi")
+    process_doi "$doi"
+}