1 files changed, 160 insertions, 0 deletions
diff --git a/alpine-to-carddav b/alpine-to-carddav
new file mode 100755
index 0000000..a0fe779
--- /dev/null
+++ b/alpine-to-carddav
@@ -0,0 +1,160 @@
+#!/bin/bash
+
+. "${0%/*}/common"
+
+if [ -z "$(git -C "${git_dir}" diff)" ]; then
+  exit
+fi
+
+find_vcs \
+| while read -r file; do
+  if [ ! -f "${file}" ]; then
+    >&2 printf 'File "%s" is in git, but not in the worktree.\n' "${file##*/}"
+    exit 1
+  fi
+  if ! git -C "${git_dir}" archive HEAD -- "${file##*/}" >/dev/null; then
+    >&2 printf 'File "%s" is in the worktree but not in git.\n' "${file##*/}"
+    exit 1
+  fi
+  if ! git -C "${git_dir}" archive HEAD -- "${file##*/}" \
+  | tar -Ox \
+  | diff -q - "${file}"; then
+    >&2 printf 'File "%s" was changed relative to git.\n' "${file##*/}"
+    exit 1
+  fi
+done
+
+print_cnt() {
+  printf 'BEGIN:VCARD\n'
+  printf 'VERSION:3.0\n'
+  for key in "${keys[@]}"; do
+    eval 'value="${'"$1${key}"'}"'
+    if [ -n "${value}" ]; then
+      printf '%s:%s\n' "${key}" "${value}"
+    fi
+  done
+  printf 'END:VCARD\n'
+}
+
+read_line() {
+  read -r line
+  for key in "${alpine_keys[@]}"; do
+    eval "${1}${key}"'="${line%%'"$(printf '\t')"'*}"'
+    eval 'line="${line#${'"${1}${key}"'}}"'
+    line="${line#$(printf '\t')}"
+  done
+}
+
+sed -i '
+  /^#/d
+' "${git_dir}"'/addressbook'
+
+last_uids=()
+git -C "${git_dir}" diff -U0 -- addressbook \
+| sed '
+  1,/^+++/d
+  $ s#$#\n@@ #
+' \
+| while read line; do
+  case "${line}" in
+    '@@ '*)
+      for last_uid in "${last_uids[@]}"; do
+        sed -i '/^'"${last_uid}"'\s/d' "${git_dir}/uids"
+        rm "${git_dir}/${last_uid}.vcs"
+      done
+      last_uids=()
+      removals=false
+    ;;
+    '+'*)
+      last_uid="${last_uids[${#last_uids[@]}]}"
+      mapfile -t last_uids < <(
+        printf '%s\n' "${last_uids[@]}" \
+        | sed '$d'
+      )
+      read_line 'new' < <(
+        printf '%s\n' "${line#+}"
+      )
+      newREV=$(
+        date -u -Iseconds \
+        | sed 's@+00:00$@Z@'
+      )
+      if [ -z "${last_uid}" ]; then
+        if ${removals}; then
+          >&2 printf 'There were more addresses added than removed.\n'
+          exit 1
+        fi
+        last_uid=$(uuidgen)
+        printf '%s\t%s\n' "${last_uid}" "${line#+}" \
+        >> "${git_dir}/uids"
+        print_cnt 'new' > "${git_dir}/${last_uid}.vcs"
+      else
+        read_line 'old' < <(
+          sed '
+            s/^'"${last_uid}"'\t//
+            t
+            d
+          ' "${git_dir}/uids"
+        )
+        sed -i '
+          /^'"${last_uid}"'\t/ {
+            i '"${last_uid}$(printf '\t')${line#+}"'
+            d
+          }
+        ' "${git_dir}/uids"
+        for key in "${alpine_keys[@]}"; do
+          if eval '[ "${old'"${key}"'}" != "${new'"${key}"'}" ]'; then
+            for insert in "${key}:" 'VERSION:' 'BEGIN:VCARD$' ''; do
+              if [ -z "${insert}" ]; then
+                >&2 printf 'Cannot find any place to insert into "%s".\n' "${uid}.vcs"
+                exit 1
+              fi
+              if ! grep -q '^'"${insert}" "${git_dir}/${uid}.vcs"; then
+                continue
+              fi
+              if [ "${insert}" = "${key}:" ]; then
+                delete_command='d'
+              else
+                delete_command=''
+              fi
+              eval 'value="${new'"${key}"'}"'
+              if [ -z "${value}" ]; then
+                insert_command=''
+              else
+                insert_command='a '"${key}"':'"${value}"
+              fi
+              sed -i '
+                /^'"${key}"'/ {
+                  '"${insert_command}"'
+                  '"${delete_command}"'
+                }
+              ' "${git_dir}/${uid}.vcs"
+              break
+            done
+          fi
+        done
+      fi
+    ;;
+    '-'*)
+      removals=true
+      if num=$(
+        sed 's@^\S\+ @@' "${git_dir}/uids" \
+        | grep -nxF "${line#-}"
+      ); then
+        last_uid=$(
+          sed -n '
+            '"${num}"' {
+              s@\s.*$@@
+              p
+            }'
+        )
+      else
+        >&2 printf 'cannot find line "%s" for removal\n' "${line#-}"
+        exit 1
+      fi
+      last_uids=(
+        "${last_uids[@]}"
+        "${last_uid}"
+      )
+    ;;
+  esac
+done