1 files changed, 115 insertions, 0 deletions
diff --git a/engines/sqlite.sh b/engines/sqlite.sh
new file mode 100644
index 0000000..c14f30c
--- /dev/null
+++ b/engines/sqlite.sh
@@ -0,0 +1,115 @@
+base_SQL="SELECT title,author,journal,year,token,doi,arxiv,citeref,prauth FROM bibliography"
+base_SQL_noprauth="SELECT title,author,journal,year,token,doi,arxiv,citeref FROM bibliography"
+
+# add quotes
+function SQL_addquotes {
+  while read -r line; do
+    # add quotes and escape string
+    if [ -n "$line" ]; then
+      line=$(escape_string "$line")
+      line="${line/%=/= }"
+      line="${line/ = /=\"}"
+      line="${line/%/\"}"
+    fi
+    echo "$line"
+  done
+}
+
+# SQL command for alphabetical ordering
+function generate_SQL_alpha {
+  echo -n "$base_SQL WHERE citeref='"
+
+  # whether there is a citeref
+  exists_citeref=0
+
+  # sift through aux file
+  grep -h "$aux_cmd" $aux | while read -r citeref; do
+    eval "citeref=\${citeref#$aux_cmd}"
+    citeref="${citeref%\}}"
+
+    # replace the citeref with a ref_map if there is any
+    if [ -n "$ref_map" ]; then
+      citeref=$(map_citeref "$citeref")
+    fi
+
+    # Only query the db if there is no matching extra entry
+    foundit=0
+    if [ ${#extra} -gt 0 ]; then
+      for entry in "${extra[@]}"; do
+	ref="${entry#*:*:}"
+	ref="${ref%%:*}"
+	if [ "$ref" = "$citeref" ]; then
+	  foundit=1
+	  break
+	fi
+      done
+    fi
+    
+    if [ "$foundit" = 0 ]; then
+      echo -n "$citeref' OR citeref='"
+      exists_citeref=1
+    fi
+  done
+
+  # if there are no citerefs close '
+  [ $exists_citeref = 0 ] && echo -n "'"
+}
+
+# fetch entries by alphabetical order
+function fetch_BBlog_entries_alpha {
+  SQL="$(generate_SQL_alpha)"
+  SQL="${SQL% OR citeref=\'} ORDER BY prauth,year"
+  sqlite3 -line "$db" "$SQL" | SQL_addquotes
+  # add an empty line
+  echo ""
+}
+
+# fetch entries by order of appearance
+function fetch_BBlog_entries_appearance {
+  # keep track of citerefs to avoid repetitions
+  citeref_list=""
+
+  # sift through aux file
+  grep -h "$aux_cmd" $aux | while read -r citeref; do
+    eval "citeref=\${citeref#$aux_cmd}"
+    citeref="${citeref%\}}"
+
+    # replace the citeref with a ref_map if there is any
+    if [ -n "$ref_map" ]; then
+      citeref=$(map_citeref "$citeref")
+    fi
+
+    # check whether the reference was already cited
+    citeref_list="$citeref_list;"
+    if $(echo "$citeref_list" | grep -q ";$citeref;"); then
+      # remove trailing ';'
+      citeref_list="${citeref_list%;}"
+    else
+      citeref_list="$citeref_list$citeref"
+
+      # Only query the db if there is no matching extra entry
+      foundit=0
+      if [ ${#extra} -gt 0 ]; then
+	for entry in "${extra[@]}"; do
+	  ref="${entry#*:}"
+	  ref="${ref%%:*}"
+	  if [ "$ref" = "$citeref" ]; then
+	    foundit=1
+	    break
+	  fi
+	done
+      fi
+      
+      if [ "$foundit" = 0 ]; then
+	SQL="$base_SQL_noprauth WHERE citeref='$citeref'"
+	sqlite3 -line "$db" "$SQL" | SQL_addquotes
+      else
+	echo "citeref=$citeref"
+      fi
+
+      # add an empty line
+      echo ""
+    fi
+  done
+}
+