Merge pull request #1205 from jimklimov/unlicensed-yet

Problem: too easy to re-release a project with obsolete Copyrights

Author: bluca

README.md

@@ -223,8 +223,11 @@ zproject's `project.xml` contains an extensive description of the available conf
     name := The name of your project (optional)
     description := A short description for your project (optional)
     email := The email address where to reach you (optional)
+    url := The website or similar resource about the project or its ecosystem (optional)
     repository := git repository holding project (optional)
     unique_class_name := "0"|"1" (optional, defaults to 0) As a failsafe, forbid naming agents or classes same as the project itself (can cause conflicts in generated header filenames). Disable explicitly (set to 0) only in legacy projects that can not regenerate otherwise, and try to fix those.
+    license := optional common tag of the project's license ("MPLv2", "GPL-2.0+", "CompanyName Proprietary" etc.); see also license.xml for longer wording
+    check_license_years := "0"|"1"|"2" (optional, defaults to 0) When a project is regenerated, and if any license text(s) are defined, we check that at least one Copyright line in at least one license text contains the current year, and warn if not. If this option is set to "1", we also pause so that interactive developers can see this warning better and intervene. With "2" require that the year is mentioned, abort GSL with year if it is not.
 -->
 <project script = "zproject.gsl" name = "zproject"
     email = "zeromq-dev@lists.zeromq.org"
@@ -237,7 +240,10 @@ zproject's `project.xml` contains an extensive description of the available conf
         part of the XML tree. This file can provide content of such tags
         as <license> (detailed text to put in generated file headers)
         and <starting_year> (a number to put in packaging copyright
-        summaries).
+        summaries). Note that a verbatim "license.xml" file would be
+        created if it is currently missing but the tag is present, and
+        then it would be seeded with a current starting_year and some
+        boilerplate reminder to specify a real license and copyright.
     -->
     <include filename = "license.xml" />
 

project.xml

@@ -46,8 +46,11 @@
     name := The name of your project (optional)
     description := A short description for your project (optional)
     email := The email address where to reach you (optional)
+    url := The website or similar resource about the project or its ecosystem (optional)
     repository := git repository holding project (optional)
     unique_class_name := "0"|"1" (optional, defaults to 0) As a failsafe, forbid naming agents or classes same as the project itself (can cause conflicts in generated header filenames). Disable explicitly (set to 0) only in legacy projects that can not regenerate otherwise, and try to fix those.
+    license := optional common tag of the project's license ("MPLv2", "GPL-2.0+", "CompanyName Proprietary" etc.); see also license.xml for longer wording
+    check_license_years := "0"|"1"|"2" (optional, defaults to 0) When a project is regenerated, and if any license text(s) are defined, we check that at least one Copyright line in at least one license text contains the current year, and warn if not. If this option is set to "1", we also pause so that interactive developers can see this warning better and intervene. With "2" require that the year is mentioned, abort GSL with year if it is not.
 -->
 <project script = "zproject.gsl" name = "zproject"
     email = "zeromq-dev@lists.zeromq.org"
@@ -60,7 +63,10 @@
         part of the XML tree. This file can provide content of such tags
         as <license> (detailed text to put in generated file headers)
         and <starting_year> (a number to put in packaging copyright
-        summaries).
+        summaries). Note that a verbatim "license.xml" file would be
+        created if it is currently missing but the tag is present, and
+        then it would be seeded with a current starting_year and some
+        boilerplate reminder to specify a real license and copyright.
     -->
     <include filename = "license.xml" />
 

zproject.gsl

@@ -50,7 +50,45 @@ function resolve_includes (xml)
     endfor
 endfunction
 
+# Sanity-check if project.xml, license.xml etc. reference the current
+# year (as starting, ending, just listed...) in Copyright line context
+function check_license_years (xml)
+    if count (my.xml.license) > 0
+        # Assign HHMMSSss into my.time and YYYYMMDD into my.date:
+        my.time = time.now(my.date)
+        my.now_year = string.substr(my.date, 0, , 4)
+        my.year_seen = 0
+        for my.xml.license
+            # This pattern supports several ways of spelling the copyright
+            # character (ASCII code 169) or registered symbol (ASCII 174).
+            # Note that in XML tag they should be spelled via escape sequences;
+            # a direct UTF character in the tag can be misinterpreted by GSL.
+            if regexp.match ("(opyright|\(C\)|\&\#(169|[xX][aA]9|174|[xX][aA][eE])\;|\&copy\;|©|&#(169|174|[xX][aA]9|[xX][aA][eE]);|$(conv.chr(169))|$(conv.chr(174))).*$(my.now_year)", license.)
+                my.year_seen += 1
+            endif
+        endfor
+        if (0 = my.year_seen)
+            echo "W: Current year '$(my.now_year)' is not listed in any license tag / Copyright line!"
+            echo "W: Do you want to Ctrl+Break now, edit your license.xml and regenerate the project?"
+            # Per PR review, there's no hard need for a pause - after the
+            # Bern convention the "copyright YYYY-YYYY" line is actually not
+            # legally required almost anywhere in the world, and is purely
+            # informative. Copyright is implicit and automatic, and with
+            # git there is enough metadata to satisfty any lawyer/court.
+            if (my.xml.check_license_years ?= 1)
+                echo "W: (Sleeping 5 sec...)"
+                thread.sleep (500)
+                echo "W: Oh well, moving on with possibly obsoleted copyrights"
+            endif
+            if (my.xml.check_license_years ?= 2)
+                abort "E: This project is configured to require that copyrights are up to date"
+            endif
+        endif
+    endif
+endfunction
+
 resolve_includes (project)
+check_license_years (project)
 
 # Check if project contains one or more C++ sources
 function project_use_cxx ()