Fix edo show when prev is null

When STAGE~0 specified and just one index with null in prev, edo would
read rsha1 (or base sha1) instead of lsha1 (last).
This is due test on prev == null. Should be different test.

src/api/EdoCache.ts

@@ -143,7 +143,7 @@ export class EdoCache {
  index = await EdoCache.readIndex(index.prev);
  } else {
  if ( (i + 1) == backref) {
- index.prev = 'null'; // set to null in case sha1 doesn't exist (because of gc)
+ index.prev = 'base'; // set to base in case sha1 doesn't exist (because of gc)
  break; // if we are
  }
  throw new Error(`Invalid object name ${stage}~${backref}`);

src/cli/EdoShow.ts

@@ -43,6 +43,9 @@ export class EdoShow {
  let stage: string = refs[1];
  let backref: number = parseInt(refs[3]);
  let file: string = refs[4];
+ if (refs[1] == 'remote/STAGE') {
+ stage = 'remote/' + (await FileUtils.readStage(true));
+ }
  if (refs[1] == 'STAGE' || refs[1] == 'HEAD') {
  stage = await FileUtils.readStage(true);
  }
@@ -54,7 +57,7 @@ export class EdoShow {
  process.exit(1);
  }
  let fileSha1 = index.elem[file][0];
- if (index.prev == 'null') {
+ if (index.prev == 'base') {
  fileSha1 = index.elem[file][1];
  }
  const out: Buffer = await EdoCache.getSha1Object(fileSha1, EdoCache.OBJ_BLOB);