add surf one-tab focus browser script

local/bin/surf

@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+focus_mode=false
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    -f|--focus)
+      focus_mode=true
+      shift
+      ;;
+    --)
+      shift
+      break
+      ;;
+    -*)
+      printf 'Unknown option: %s\nUsage: %s [-f|--focus] <url> [chromium args...]\n' "$1" "${0##*/}" >&2
+      exit 1
+      ;;
+    *)
+      break
+      ;;
+  esac
+done
+
+if [[ $# -lt 1 ]]; then
+  printf 'Usage: %s [-f|--focus] <url> [chromium args...]\n' "${0##*/}" >&2
+  exit 1
+fi
+
+raw_target="$1"
+shift
+
+urlencode() {
+  local input="$1"
+  local output=""
+  local i char hex
+
+  for ((i = 0; i < ${#input}; i++)); do
+    char="${input:i:1}"
+    case "$char" in
+      [a-zA-Z0-9.~_-])
+        output+="$char"
+        ;;
+      ' ')
+        output+='%20'
+        ;;
+      *)
+        printf -v hex '%%%02X' "'$char"
+        output+="$hex"
+        ;;
+    esac
+  done
+
+  printf '%s\n' "$output"
+}
+
+looks_like_url_without_schema() {
+  local target="$1"
+
+  [[ ! "$target" =~ [[:space:]] ]] || return 1
+  [[ "$target" =~ ^localhost([:/?#].*)?$ ]] && return 0
+  [[ "$target" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}([:/?#].*)?$ ]] && return 0
+  [[ "$target" =~ ^([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,}([:/?#].*)?$ ]]
+}
+
+if [[ "$raw_target" =~ ^[[:alpha:]][[:alnum:]+.-]*: ]]; then
+  url="$raw_target"
+elif looks_like_url_without_schema "$raw_target"; then
+  url="https://$raw_target"
+else
+  encoded_query="$(urlencode "$raw_target")"
+  url="https://search.hunner.dev/search?q=$encoded_query"
+fi
+
+if "$focus_mode"; then
+  chromium_args=(
+    --kiosk
+    --new-window
+    "$url"
+  )
+else
+  chromium_args=(
+    --app="$url"
+    --new-window
+  )
+fi
+
+chromium \
+  "${chromium_args[@]}" \
+  "$@"