integrate author check into travis

.travis.yml

@@ -1,6 +1,8 @@
 language: python
 sudo: false
 cache: pip
+git:
+  depth: 100000
 addons:
   apt:
     packages:
@@ -37,6 +39,7 @@ matrix:
     - python: pypy3
 before_install:
     - pip install tox codecov 'sphinx>=1.5.1'
+    - ./doc/generate_authors.sh --check
 script:
     - tox
     - codecov

CONTRIBUTING.rst

@@ -12,6 +12,15 @@ The pull requests and issues will be prefilled with templates. Please fill in yo
 This project uses `semantic versioning <http://semver.org/>`_ and tries to adhere to the proposed rules as
 well as possible.
 
+Author-list
+-----------
+
+This project keeps a list of authors. This can be auto-generated by calling `./doc/generate-authors.sh`.
+When contributing the first time, please include a commit with the output of this script in place.
+Otherwise the integration-check will fail.
+
+When you change your username or mail-address, please also update the `.mailmap` and the authors-list.
+
 Style-Guide
 -----------
 

doc/generate_authors.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+GENLIST=$(git shortlog -s -n | cut -f2 | sort)
+AUTHORSFILE="$(dirname $0)/../AUTHORS"
+TEMPAUTHORSFILE="/tmp/python-escpos-authorsfile"
+
+if [ "$#" -eq 1 ]
+    then
+        echo "$GENLIST">$TEMPAUTHORSFILE
+        diff -q --from-file $AUTHORSFILE $TEMPAUTHORSFILE
+    else
+	echo "$GENLIST">$AUTHORSFILE
+fi
+

generate_authors.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-git shortlog -s -n | cut -f2 | sort