Change: Use git revision hash (with "modified" prefix) for gamelog

1 files changed, 26 insertions, 2 deletions

diff --git a/src/gamelog.cpp b/src/gamelog.cpp
index 05653910d..29910d7ad 100644
--- a/src/gamelog.cpp
+++ b/src/gamelog.cpp
@@ -40,6 +40,30 @@ static LoggedAction *_current_action = NULL; ///< current action we are logging,
 
 
 /**
+ * Return the revision string for the current client version, for use in gamelog.
+ * The string returned is at most GAMELOG_REVISION_LENGTH bytes long.
+ */
+static const char * GetGamelogRevisionString()
+{
+	/* Allocate a buffer larger than necessary (git revision hash is 40 bytes) to avoid truncation later */
+	static char gamelog_revision[48] = { 0 };
+	assert_compile(lengthof(gamelog_revision) > GAMELOG_REVISION_LENGTH);
+
+	if (IsReleasedVersion()) {
+		return _openttd_revision;
+	} else if (gamelog_revision[0] == 0) {
+		/* Prefix character indication revision status */
+		assert(_openttd_revision_modified < 3);
+		gamelog_revision[0] = "gum"[_openttd_revision_modified]; // g = "git", u = "unknown", m = "modified"
+		/* Append the revision hash */
+		strecat(gamelog_revision, _openttd_revision_hash, lastof(gamelog_revision));
+		/* Truncate string to GAMELOG_REVISION_LENGTH bytes */
+		gamelog_revision[GAMELOG_REVISION_LENGTH - 1] = '\0';
+	}
+	return gamelog_revision;
+}
+
+/**
  * Stores information about new action, but doesn't allocate it
  * Action is allocated only when there is at least one change
  * @param at type of action
@@ -415,7 +439,7 @@ void GamelogRevision()
 	if (lc == NULL) return;
 
 	memset(lc->revision.text, 0, sizeof(lc->revision.text));
-	strecpy(lc->revision.text, _openttd_revision, lastof(lc->revision.text));
+	strecpy(lc->revision.text, GetGamelogRevisionString(), lastof(lc->revision.text));
 	lc->revision.slver = SAVEGAME_VERSION;
 	lc->revision.modified = _openttd_revision_modified;
 	lc->revision.newgrf = _openttd_newgrf_version;
@@ -484,7 +508,7 @@ void GamelogTestRevision()
 		}
 	}
 
-	if (rev == NULL || strcmp(rev->revision.text, _openttd_revision) != 0 ||
+	if (rev == NULL || strcmp(rev->revision.text, GetGamelogRevisionString()) != 0 ||
 			rev->revision.modified != _openttd_revision_modified ||
 			rev->revision.newgrf != _openttd_newgrf_version) {
 		GamelogRevision();