/*
** Translate a hook command string into its executable format by
** converting every %-substitutions as follows:
**
**     %F     ->    Name of the fossil executable
**     %R     ->    Name of the repository
**     %A     ->    Auxiliary information filename (might be empty string)
**
** The returned string is obtained from fossil_malloc() and should
** be freed by the caller.
*/
static char *hook_subst(
  const char *zCmd,
  const char *zAuxFilename   /* Name of auxiliary information file */
){
  Blob r;
  int i;
  blob_init(&r, 0, 0);
  while( zCmd[0] ){
    for(i=0; zCmd[i] && zCmd[i]!='%'; i++){}
    blob_append(&r, zCmd, i);
    if( zCmd[i]==0 ) break;
    if( zCmd[i+1]=='F' ){
      blob_append(&r, g.nameOfExe, -1);
      zCmd += i+2;
    }else if( zCmd[i+1]=='R' ){
      blob_append(&r, g.zRepositoryName, -1);
      zCmd += i+2;
    }else if( zCmd[i+1]=='A' ){
      if( zAuxFilename ) blob_append(&r, zAuxFilename, -1);
      zCmd += i+2;
    }else{
      blob_append(&r, zCmd+i, 1);
      zCmd += i+1;
    }
  }
  blob_str(&r);
  return r.aData;

**        hook processing.  Used for debugging.
**
** >  fossil hook test [OPTIONS] ID
**
**        Run the hook script given by ID for testing purposes.
**        Options:
**
**            --dry-run          Print the script on stdout rather than run it
**            --base-rcvid  N    Pretend that the hook-last-rcvid value is N
**            --new-rcvid M      Pretend that the last rcvid valud is M
**            --aux-file NAME    NAME is substituted for %A in the script
**
**        The --base-rcvid and --new-rcvid options are silently ignored if
**        the hook type is not "after-receive".  The default values for
**        --base-rcvid and --new-rcvid cause the last recieve to be processed.
*/
void hook_cmd(void){
  const char *zCmd;

    db_finalize(&q);
  }else
  if( strncmp(zCmd, "test", nCmd)==0 ){
    Stmt q;
    int bDryRun = find_option("dry-run", "n", 0)!=0;
    const char *zOrigRcvid = find_option("base-rcvid",0,1);
    const char *zNewRcvid = find_option("new-rcvid",0,1);
    const char *zAuxFilename = find_option("aux-file",0,1);
    verify_all_options();
    if( g.argc<4 ) usage("test ID");
    int id = atoi(g.argv[3]);
    if( zOrigRcvid==0 ){
      zOrigRcvid = db_text(0, "SELECT max(rcvid)-1 FROM rcvfrom");
    }
    db_prepare(&q,
      "SELECT json_extract(value,'$[%d].cmd'), "
      "       json_extract(value,'$[%d].type')=='after-receive'"
      "  FROM config"
      " WHERE name='hooks' AND json_valid(value)",
      id, id
    );
    while( db_step(&q)==SQLITE_ROW ){
      const char *zCmd = db_column_text(&q,0);
      char *zCmd2 = hook_subst(zCmd, zAuxFilename);
      int needOut = db_column_int(&q,1);
      Blob out;
      blob_init(&out,0,0);
      if( needOut ) hook_changes(&out, zOrigRcvid, zNewRcvid);
      if( bDryRun ){
        fossil_print("%s\n", zCmd2);
        if( needOut ){

  );
  while( db_step(&q)==SQLITE_ROW ){
    char *zCmd;
    FILE *f;
    if( cnt==0 ){
      hook_changes(&chng, zLastRcvid, 0);
    }
    zCmd = hook_subst(db_column_text(&q,0), 0);
    f = popen(zCmd, "w");
    if( f ){
      fwrite(blob_buffer(&chng),1,blob_size(&chng),f);
      pclose(f);
    }
    fossil_free(zCmd);
    cnt++;
  }
  db_finalize(&q);
  db_set("hook-last-rcvid", zNewRcvid, 0);
  blob_reset(&chng);
hook_backoffice_done:
  db_commit_transaction();
  return cnt;
}

/*
** Run all hooks of type zType.  Use zAuxFile as the auxiliary information
** file.
**
** If any hook returns non-zero, then stop running and return non-zero.
** Return zero only if all hooks return zero.
*/
int hook_run(const char *zType, const char *zAuxFile, int traceFlag){
  Stmt q;
  int rc = 0;
  if( !db_exists("SELECT 1 FROM config WHERE name='hooks'") ){
    return 0;
  }
  db_prepare(&q,
      "SELECT json_extract(jx.value,'$.cmd') "
      "  FROM config, json_each(config.value) AS jx"
      " WHERE config.name='hooks' AND json_valid(config.value)"
      "   AND json_extract(jx.value,'$.type')=%Q"
      " ORDER BY json_extract(jx.value,'$.seq');",
      zType
  );
  while( db_step(&q)==SQLITE_ROW ){
    char *zCmd;
    zCmd = hook_subst(db_column_text(&q,0), zAuxFile);
    if( traceFlag ){
      fossil_print("%s hook: %s\n", zType, zCmd);
    }
    rc = fossil_system(zCmd);
    fossil_free(zCmd);
    if( rc ){
      break;
    }
  }
  db_finalize(&q);
  return rc;
}