First version which supports custom signaling (callbacks)

2022-03-25 22:48:56 +01:00
parent 6fa778f9a2
commit 525e1744cb
4 changed files with 100 additions and 0 deletions
--- a/webdiff.sh
+++ b/webdiff.sh
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# webdiff.sh <DIFFNAME> <DIFFURL> [CUSTOM SED]
+#
+#  Author: Martin Winkler
+# License: Please refer to the repository
+#  Origin: https://winklerfamilie.eu/git/SmallThings/webdiff.git
+
+# To get error from any command in the pipe
+set -o pipefail
+
+webdiff() {
+  local retval=0
+  local diffname="$1"
+  local diffurl="$2"
+  local diffline= # line count of current diff
+
+  readonly _origin="$(cd "$(dirname -- "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)"
+  readonly newgrab="/tmp/webdiff/new_${diffname}"
+  readonly oldgrab="${_origin}/compare/old_${diffname}"
+  readonly diffnow="/tmp/webdiff/diff_${diffname}.txt"
+
+  readonly wd_config="${_origin}/webdiff.conf"
+
+  # end if no configuration is found
+  . "${wd_config}" 2>/dev/null || { printf "No configuration found\n"; return 1; }
+
+  # check parameter
+  if [ $# -lt 2 ]; then
+    echo Error
+    exit 1
+  else
+    shift 2
+  fi
+
+  mkdir -p "$(dirname "${newgrab}")" "$(dirname "${oldgrab}")"
+
+  # Save only the html <body> part for comparison
+  curl -sL "${diffurl}" | grep -v "script id=" \
+    | sed -n '/<body.*>/,/<\/body/p' > "${newgrab}" \
+    || { wd_callback_error "${diffname}" "${diffurl}" "curl"; return 1; }
+
+  # Apply custom sed command
+  if [[ "${1:-}" ]]; then
+    cat "${newgrab}" | sed "$@" > "${newgrab}.2"
+    mv "${newgrab}.2" "${newgrab}"
+  fi
+
+  # Initial diff shall not fail
+  [ ! -e "${oldgrab}" ] && cp "${newgrab}" "${oldgrab}"
+
+  # Write diff to file ${diffnow} and count lines
+  difflines=$(diff "${newgrab}" "${oldgrab}" 2>/dev/null | tee "${diffnow}" | wc -l 2>/dev/null)
+  [ $? -gt 1 ] && { wd_callback_error "${diffname}" "${diffurl}" "diff"; return 1; }
+
+  if [ ${difflines} -ne 0 ]; then
+    wd_callback_diff "${diffname}" "${diffurl}" "${difflines}" "${diffnow}"
+    install -b -S "_$(date +%Y%m%d_%H%M%S).bck" "${newgrab}" "${oldgrab}"
+    retval=1
+  fi
+
+  rm -f "${newgrab}"
+
+  return ${retval}
+}
+
+webdiff "$@"
+