bin: add git-ignore

bin/git-ignore

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -eu
+
+WORKDIR="${XDG_CACHE_HOME:-$HOME/.cache}/git-ignore"
+URL="https://github.com/github/gitignore.git"
+
+if [ ! -d "$WORKDIR" ]; then
+  git clone --quiet --depth 1 "$URL" "$WORKDIR"
+else
+  git -C "$WORKDIR" pull --quiet
+fi
+
+find "$WORKDIR" -maxdepth 1 -type f -name '*gitignore' |
+  sed -e "s,^$WORKDIR/\(.*\)\.gitignore$,\1," |
+  sort |
+  fzf --multi \
+    --preview="cat $WORKDIR/{}.gitignore" \
+    --bind='ctrl-p:toggle-preview' |
+  while read -r lang; do
+    echo "############################################################"
+    echo "# ${lang}"
+    echo "############################################################"
+    cat "$WORKDIR/${lang}.gitignore"
+    echo
+  done