Refactored chunk of tribits_generate_single_repo_version_string for r…

…euse (#597)

Moved git commit info functionality of tribits_generate_single_repo_version_string to
a seperate helper function named tribites_generate_commit_info_string. The core functionality and
output is the same. This is in prep for reuse of that functionality inside of the original
tribits_generate_single_repo_version string.

tribits/core/package_arch/TribitsGitRepoVersionInfo.cmake

@@ -105,36 +105,35 @@ function(tribits_git_repo_sha1  gitRepoDir  gitRepoSha1Out)
 endfunction()
 
 
-# Run the git log command to get the version info for a git repo
-#
-function(tribits_generate_single_repo_version_string  gitRepoDir
-   repoVersionStringOut
-  )
-
-  tribits_assert_git_executable()
-
-  # A) Get the basic version info.
-
+# Run git log to generate a string containing commit sha1, author, date, email
+# and the commit summary
+
+function(tribits_generate_commit_info_string gitRepoDir 
+   commitInfoStringOut
+  ) 
+
+  # A) Get commit hash, author, date, and email
+
   execute_process(
     COMMAND ${GIT_EXECUTABLE} log -1 "--pretty=format:%h [%ad] <%ae>"
     WORKING_DIRECTORY ${gitRepoDir}
     RESULT_VARIABLE gitCmndRtn
-    OUTPUT_VARIABLE gitCmndOutput
+    OUTPUT_VARIABLE gitCmndOut 
     OUTPUT_STRIP_TRAILING_WHITESPACE  ERROR_STRIP_TRAILING_WHITESPACE
     )
-
+  
   if (NOT gitCmndRtn STREQUAL 0)
     message(FATAL_ERROR "ERROR, ${GIT_EXECUTABLE} command returned ${gitCmndRtn}!=0"
-      " with output '${gitCmndOutput}' for repo ${gitRepoDir}!")
+      " for SHA1 of repo ${gitRepoDir}!")
     set(gitVersionLine "Error, could not get version info!")
   else()
-    set(gitVersionLine "${gitCmndOutput}")
+    set(gitVersionLine "${gitCmndOut}")
   endif()
 
   # B) Get the first 80 chars of the summary message for more info
 
   execute_process(
-    COMMAND ${GIT_EXECUTABLE} log -1 --pretty=format:%s
+    COMMAND ${GIT_EXECUTABLE} log -1 "--pretty=format:%s"
     WORKING_DIRECTORY ${gitRepoDir}
     RESULT_VARIABLE gitCmndRtn
     OUTPUT_VARIABLE gitCmndOutput
@@ -143,15 +142,34 @@ function(tribits_generate_single_repo_version_string  gitRepoDir
 
   if (NOT gitCmndRtn STREQUAL 0)
     message(FATAL_ERROR "ERROR, ${GIT_EXECUTABLE} command returned ${gitCmndRtn}!=0"
-      " for extra repo ${gitRepoDir}!")
+      " for SHA1 of repo ${gitRepoDir}!")
     set(gitSummaryStr "Error, could not get version summary!")
   else()
     set(maxSummaryLen 80)
     string(SUBSTRING "${gitCmndOutput}" 0 ${maxSummaryLen} gitSummaryStr)
   endif()
 
-  set(${repoVersionStringOut}
+  set(${commitInfoStringOut} 
     "${gitVersionLine}\n${gitSummaryStr}" PARENT_SCOPE)
+endfunction()
+
+
+
+# Run the git log command to get the version info for a git repo
+#
+function(tribits_generate_single_repo_version_string  gitRepoDir
+   repoVersionStringOut
+  )
+
+  tribits_assert_git_executable()
+
+  # A) Get HEAD commit's info
+
+  tribits_generate_commit_info_string(
+    ${gitRepoDir}
+    headCommitInfoString)
+
+  set(${repoVersionStringOut} "${headCommitInfoString}" PARENT_SCOPE)
 
 endfunction()
 # NOTE: Above, it is fine if ${maxSummaryLen} > len(${gitCmndOutput}) as