Initial commit

optipdf

@@ -0,0 +1,105 @@
+#!/bin/bash
+# vi: et sts=4 sw=4 ts=4
+
+PRESERVE_TIMESTAMP=0
+
+TEMP_FILES=()
+cleanup() {
+    rm -f -- "${TEMP_FILES[@]}"
+}
+trap 'cleanup' EXIT
+
+file_size() {
+    stat \
+        --format='%s' \
+        --dereference \
+        -- \
+        "$@" \
+        2>/dev/null
+}
+
+# copies $2 over to $1 if $2 is smaller than $1
+use_smaller() {
+    # if `$TEMP' isn't empty and it's of a smaller size than `$FILE',
+    # preserve every attribute and replace `$FILE' with `$TEMP'
+    local \
+        FILE=$1 \
+        TEMP=$2 \
+        ORIGSIZE \
+        TEMPSIZE
+
+    ORIGSIZE=$(file_size "$FILE")
+    TEMPSIZE=$(file_size "$TEMP")
+
+    if [[ -f $TEMP &&
+        $TEMPSIZE -gt 0 &&
+        $TEMPSIZE -lt $ORIGSIZE
+    ]]; then
+
+        # Preserve attributes by copying them from the original file to the
+        # temporary one
+        chmod \
+            --reference="$FILE" \
+            -- \
+            "$TEMP" &&
+
+        if [[ $PRESERVE_TIMESTAMP -ne 0 ]]; then
+            touch \
+                --reference="$FILE" \
+                -- \
+                "$TEMP"
+        fi &&
+
+        if [[ $UID -eq 0 ]]; then
+            # We are root, so we can chown(1) things
+            chown \
+                --reference="$FILE" \
+                -- \
+                "$TEMP"
+        fi &&
+
+        cp \
+            --preserve=mode,ownership,timestamps \
+            -- \
+            "$TEMP" \
+            "$FILE"
+
+        local ERR=$?
+        case "$ERR" in
+            '0')
+                printf 'Optimized "%s"\n' \
+                    "$FILE" \
+                    >&2
+                ;;
+            *)
+                printf 'Failed to optimize "%s"!\n' \
+                    "$FILE" \
+                    >&2
+                ;;
+        esac
+
+    fi
+
+    # Protect against unsuccessful following file writes to our TEMP file
+    rm -f -- "$TEMP"
+
+}
+
+TEMP0=$(mktemp -t "${0##*/}.XXXXXX")
+TEMP1=$(mktemp -t "${0##*/}.XXXXXX")
+TEMP_FILES+=("$TEMP0" "$TEMP0")
+
+ERRORS=0
+for FILE; do
+    rm -f -- "$TEMP0" "$TEMP1"
+    if !
+        qpdf --stream-data=uncompress -- "$FILE" "$TEMP0" &&
+        qpdf --stream-data=compress -- "$TEMP0" "$TEMP1" &&
+        use_smaller "$FILE" "$TEMP1"; then
+        (( ++ERRORS ))
+    fi
+done
+
+if [[ $ERRORS -gt 0 ]]; then
+    exit 1
+fi