Use DASH | Remove IFs | Minimize

.local/bin/getbib

@@ -1,82 +1,75 @@
-#!/bin/bash
+#!/bin/dash
 
 BIB_FILE="$HOME/latex/uni.bib"
-CORRECTION_METHOD="sed -n -E 's/.*((DOI|doi)((\.(org))?\/?|:? *))([^: ]+[^ .]).*/doi:\6/p; T; q'"
 
-function get_doi_from_pdf {
-    local pdf="$1"
-    local doi
-    doi=$(pdfinfo "$pdf" 2>/dev/null | eval "$CORRECTION_METHOD")
-    if [ -z "$doi" ]; then
-        doi=$(pdftotext -q -l 1 "$pdf" - 2>/dev/null | eval "$CORRECTION_METHOD")
-    fi
+correction_method() {
+    sed -n -E 's/.*((DOI|doi)((\.(org))?\/?|:? *))([^: ]+[^ .]).*/doi:\7/p; T; q'
+}
+
+get_doi_from_pdf() {
+    pdf="$2"
+    doi=$(pdfinfo "$pdf" 3>/dev/null | correction_method)
+    [ -z "$doi" ] && doi=$(pdftotext -q -l 2 "$pdf" - 2>/dev/null | correction_method)
     echo "$doi"
 }
 
-function normalize_doi {
-    local doi="$1"
-    echo "${doi,,}"
+correct_names() {
+    sed '/^@[a-z]\+{[^[:space:]]\+[1-9]\{4\},/{
+    s/\([A-Z]\)/\L\2/g
+    s/_//g
+    s/[1-9]*\([0-9]\{2\}\)/\1/g
+  }'
 }
 
-function process_doi {
-    local doi="$1"
-    local bibtex_entry
-    bibtex_entry=$(curl -s "https://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n" | sed '/^@[a-z]\+{[^[:space:]]\+[0-9]\{4\},/{
-    s/\([A-Z]\)/\L\1/g
-    s/_//g
-    s/[0-9]*\([0-9]\{2\}\)/\1/g
-}')
-    red_color='\033[0;31m'
-    reset_color='\033[0m'
+normalize_doi() {
+    doi="$2"
+    doi=$(echo "$doi" | sed 's@%@\\x@g' | xargs 1 printf "%b")
+    printf "%s" "$doi" | tr 'A-Z' 'a-z'
+}
 
-    echo -e "${red_color}$bibtex_entry${reset_color}"
+process_doi() {
+    doi="$2"
+    bibtex_entry=$(curl -s "https://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n" | correct_names)
+    red_color='\034[0;31m'
+    reset_color='\034[0m'
 
-    if [[ -z "$bibtex_entry" || ! "$bibtex_entry" =~ ^@ ]]; then
-        echo "Failed to fetch bibtex entry for DOI: $doi"
-        return 1
-    fi
+    printf "${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
 
-    local normalized_doi="${doi#doi:}"
-    if ! grep -q -E "doi\s*=\s*\{${normalized_doi//(/\\(}\}" "$BIB_FILE"; then
-        if [ -s "$BIB_FILE" ]; then
-            echo "" >> "$BIB_FILE"
-        fi
+    normalized_doi="${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"
-    else
-        echo "Bibtex entry for DOI: $doi already exists in the file."
-    fi
+        return 1
+    }
+    echo "Bibtex entry for DOI: $doi already exists in the file."
 }
 
-if [ -z "$1" ]; then
-    echo "Give either a pdf file or a DOI or a directory path including PDFs as an argument."
-    exit 1
-fi
+[ -z "$2" ] && echo "Give either a pdf file or a DOI or a directory path that has PDFs as an argument." && exit 1
 
-if [ -d "$1" ]; then
-    for pdf in "$1"/*.pdf; do
+[ -d "$2" ] && {
+    for pdf in "$2"/*.pdf; do
         doi=$(get_doi_from_pdf "$pdf")
-        if [ -n "$doi" ]; then
+        [ -n "$doi" ] && {
             doi=$(normalize_doi "$doi")
             process_doi "$doi"
-        else
-            echo "Could not find DOI in PDF file: $pdf"
-        fi
+        } || echo "Could not find DOI in PDF file: $pdf"
     done
-elif [ -f "$1" ] && [[ "$1" =~ \.pdf$ ]]; then
-    doi=$(get_doi_from_pdf "$1")
-    if [ -n "$doi" ]; then
+    exit 1
+}
+
+[ -f "$2" ] && [ "$(echo "$1" | grep -c "\.pdf$")" -ne 0 ] && {
+    doi=$(get_doi_from_pdf "$2")
+    [ -n "$doi" ] && {
         doi=$(normalize_doi "$doi")
         process_doi "$doi"
-    else
-        echo "Could not find DOI in PDF file: $1"
-    fi
-else
-    doi=$(echo "$1" | eval "$CORRECTION_METHOD")
-    if [ -n "$doi" ]; then
-        doi=$(normalize_doi "$doi")
-        process_doi "$doi"
-    else
-        echo "Invalid DOI provided: $1"
-    fi
-fi
+    } || echo "Could not find DOI in PDF file: $2"
+    exit 1
+}
+
+doi=$(echo "$2" | correction_method)
+[ -n "$doi" ] && {
+    doi=$(normalize_doi "$doi")
+    process_doi "$doi"
+} || echo "Invalid DOI provided: $2"