1 files changed, 65 insertions, 0 deletions
diff --git a/4car b/4car
new file mode 100755
index 0000000..0417d21
--- /dev/null
+++ b/4car
@@ -0,0 +1,65 @@
+#!/bin/bash
+
+function print_usage() {
+  echo "Usage: $0 <html file>"
+  exit
+}
+
+error() {
+  echo "$1" >&2
+}
+
+assert_command() {
+  if ! which "$1" 2>&1 > /dev/null; then
+    error "$0 requires $1 to be installed" 1>&2
+    exit 1
+  fi
+}
+
+split_pipe() {
+  while read i; do
+    echo "  $i" >> /dev/tty
+    echo "$i"
+  done
+}
+
+filter_image_urls() {
+  grep -oe 'http[s]*:\/\/i\.4cdn\.org\/[a-z0-9]\+\/[0-9]\+\.[a-zA-Z0-9]\+' \
+    -e 'http[s]*:\/\/is[0-9]\+\.4chan\.org\/[a-z0-9]\+\/[0-9]\+\.[a-zA-Z0-9]\+' \
+    -e 'http[s]*:\/\/img\.fireden\.net\/[a-z0-9]\+\/image\/[0-9]\+\/[0-9]\+\/[0-9]\+\.[a-zA-Z0-9]\+'
+}
+
+# Check dependencies
+assert_command sponge
+assert_command wget
+
+if [ -z "$1" ]; then
+  print_usage
+fi
+
+for i in "$@"; do
+  file="$i"
+  dir="${i%.html}_files"
+  rdir="$(echo "$dir" | sed 's/&/\\\\\\&/g')"
+
+  if ! [ -f "$file" ] || [ "$(file -b --mime-type "$file")" != text/html ]; then
+    error "Not a valid webpage file: $file"
+    continue
+  elif ! [ -d "$dir" ]; then
+    error "Not a valid webpage directory: $dir"
+    continue
+  fi
+
+  echo "Downloading images for $file"
+
+  # Piping autism. Here we download all the files and use a regex to modify the HTML in a single step.
+  filter_image_urls < "$file" |
+    sort |
+    uniq |
+    wget -i - -P "$dir" -nv |&
+    split_pipe |
+    filter_image_urls |
+    sed "s/\(.*\)\/\(.*\)/s;\1\/\2;.\/$rdir\/\2;g/" |
+    sed -f - "$file" |
+    sponge "$file"
+done