in stable releases, link to gitlab files with the corresponding tag

CMakeLists.txt

@@ -126,6 +126,13 @@ set(GMSH_SHORT_VERSION
 set(GMSH_VERSION "${GMSH_SHORT_VERSION}${GMSH_EXTRA_VERSION}")
 set(GMSH_SHORT_LICENSE "GNU General Public License")
 
+set(GMSH_GITLAB_PREFIX "https://gitlab.onelab.info/gmsh/gmsh")
+if(GMSH_RELEASE)
+  set(GMSH_GITLAB_PREFIX "${GMSH_GITLAB_PREFIX}/blob/gmsh_${GMSH_SHORT_VERSION}")
+else()
+  set(GMSH_GITLAB_PREFIX "${GMSH_GITLAB_PREFIX}/blob/master")
+endif()
+
 set(GMSH_API api/gmsh.h api/gmshc.h api/gmsh.h_cwrap)
 
 if(ENABLE_PRIVATE_API)

api/GenApi.py

@@ -1600,13 +1600,12 @@ class API:
                 cpp = find_function('C++', path + '/' + name, cpp_data)
                 py = find_function('Python', path + '/' + name, py_data)
                 def write_matches(lang, matches, max_matches):
-                    git = 'https://gitlab.onelab.info/gmsh/gmsh/tree/master/'
                     f.write(lang + ' (')
                     for i in range(min(max_matches,
                                        len(matches))):  # write max 5 matches
                         if i > 0: f.write(', ')
-                        f.write('@url{' + git + matches[i][0][3:] + '#L' +
-                                str(matches[i][1]) + ',' +
+                        f.write('@url{@value{GITLAB-PREFIX}/' +  matches[i][0][3:] +
+                                '#L' + str(matches[i][1]) + ',' +
                                 os.path.basename(matches[i][0]) + '}')
                     if len(matches) > max_matches: f.write(', ...')
                     f.write(')')

doc/texinfo/version.texi

 @c This file was generated by cmake: do not edit manually!
 
 @set GMSH-VERSION 4.6.1  (development version)
+@set GITLAB-PREFIX https://gitlab.onelab.info/gmsh/gmsh/blob/master

doc/texinfo/version.texi.in

 @c This file was generated by cmake: do not edit manually!
 
 @set GMSH-VERSION ${GMSH_MAJOR_VERSION}.${GMSH_MINOR_VERSION}.${GMSH_PATCH_VERSION} ${GMSH_EXTRA_VERSION_TEXI}
+@set GITLAB-PREFIX ${GMSH_GITLAB_PREFIX}