Describe: add support for core.abbrev config option

If core.abbrev is unset or "auto" estimate abbreviation length like C
git does:
- Estimate repository's object count by only considering packed objects,
  round up to next power of 2
- With the order of 2^len objects, we expect a collision at 2^(len/2).
  But we also care about hex chars, not bits, and there are 4 bits per
  hex. So all together we need to divide by 2; but we also want to round
  odd numbers up, hence adding one before dividing.
- For small repos use at least 7 hexdigits
- If object database fails to determine object count use 7 hexdigits as
  fallback

If it is set to "no" do not abbreviate object-ids.

Otherwise set it to the configured value capped to the range between 4
and length of an unabbreviated object-id.

Change-Id: I425f9724b69813dbb57872466bf2d2e1d6dc72c6

1 files changed, 1 insertions, 0 deletions

diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
index 6e0d8f5627..e6f4e65e70 100644
--- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
+++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
@@ -366,6 +366,7 @@ invalidAncestryLength=Invalid ancestry length
 invalidBooleanValue=Invalid boolean value: {0}.{1}={2}
 invalidChannel=Invalid channel {0}
 invalidCommitParentNumber=Invalid commit parent number
+invalidCoreAbbrev=Invalid value {0} of option core.abbrev
 invalidDepth=Invalid depth: {0}
 invalidEncoding=Invalid encoding from git config i18n.commitEncoding: {0}
 invalidEncryption=Invalid encryption