From 4dc2bbda9102321cee5701736be76ad559e7b7f6 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sun, 8 Apr 2018 21:40:18 +0200
Subject: soweit fertig

---
 Makefile         |  2 +-
 digest-mailer.in | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 92 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index abb7884..fe6572a 100644
--- a/Makefile
+++ b/Makefile
@@ -48,7 +48,7 @@ all: man.commons digest-mailer digest-mailer.1
 .PHONY:	install dist clean
 
 install: all
-	install -d -m0755 $(DESTDIR)$(LIBDIR)/digest-mailer
+	install -d -m1777 $(DESTDIR)$(LIBDIR)/digest-mailer
 	install -D -m0755 digest-mailer $(DESTDIR)$(BINDIR)/digest-mailer
 	install -D -m0644 digest-mailer.1 $(DESTDIR)$(MANDIR)/man1/digest-mailer.1
 	install -D -m0644 digest-mailer.conf $(DESTDIR)$(ETCDIR)/digest-mailer.conf
diff --git a/digest-mailer.in b/digest-mailer.in
index 4e88494..be071fd 100644
--- a/digest-mailer.in
+++ b/digest-mailer.in
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set +e
+
 verwendung() {
   >&2 echo 'digest-mailer collects emails into digests before sending them.'
   >&2 echo ''
@@ -32,4 +34,92 @@ then
   . #ETCDIR#/digest-mailer.conf
 fi
 
-#TODO
+message=$(
+  cat
+)
+sender=$(
+  whoami | \
+    sha224sum | \
+    awk '{print $1}'
+)
+receiver=$(
+  printf '%s\n' "${message}" | \
+    sed -n '
+      /^$/q
+      s/^To:\s*//
+      T
+      p
+    ' | \
+    sha224sum | \
+    awk '{print $1}'
+)
+time=$(
+  date +%s
+)
+hash=$(
+  printf '%s' "${message}" | \
+    sha224sum | \
+    awk '{print $1}'
+)
+if [ -s "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent" ]; then
+  last_sent=$(
+    cat "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent"
+  )
+else
+  last_sent='0'
+fi
+
+printf '%s' "${message}" > "#LIBDIR#/digest-mailer/${sender}.${receiver}.${time}.${hash}"
+
+first_unsent=$(
+  find '#LIBDIR#/digest-mailer' -regextype grep -maxdepth 1 -mindepth 1 \
+    -regex ".*/${sender}\.${receiver}\.[0-9]\+\.[0-9a-f]\+\$" \
+    -printf '%f\n' | \
+    cut -d. -f3 | \
+    sort -nr | \
+    tail -n1
+)
+
+to_send=$(
+  find '#LIBDIR#/digest-mailer' -regextype grep -maxdepth 1 -mindepth 1 \
+    -regex ".*/${sender}\.${receiver}\.[0-9]\+\.[0-9a-f]\+\$" | \
+    sort
+)
+to_send_count=$(
+  printf '%s\n' "${to_send}" | \
+    wc -l
+)
+if [ $((last_sent + min_delay)) -gt ${time} ]; then
+  # last email was sent too close
+  exit
+fi
+if [ ${to_send_count} -gt 1 ] && \
+  [ $(printf 'scale=10; (%s+%s)*%s + (%s+%s)*(1-%s)\n' "${min_delay}" "${last_sent}" "${agressivity}" "${max_delay}" "${first_unsent}" "${agressivity}" | bc) -gt ${time} ] && \
+  [ $((first_unsent + max_delay)) -ge ${time} ]; then
+  exit
+fi
+
+printf '%s' "${time}" > "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent"
+
+if [ ${to_send_count} -eq 1 ]; then
+  ${mail_cmd} < "${to_send}"
+  rm "${to_send}"
+  exit
+fi
+
+{
+  sed -n '
+    /^$/q
+    s/^Subject:.*$/Subject: mail-digest/
+  ' "$(
+    printf '%s' "${to_send}" | \
+      head -n1
+    )"
+  printf '\n'
+  printf '%s\n' "${to_send}" | \
+    while read -r file; do
+      cat "${file}"
+      printf '\n'
+      rm "${file}"
+    done
+} | ${mail_cmd}
-- 
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