engine='dot' as only chunk fails

[WilDoane]

An Rmd file with only one chunk and where that chunk uses engine='dot' fails because the temporary directory for output images doesn't get created (or so it seems).

FAILS

---
output: pdf_document

---
This relies upon Graphviz already being installed and launchable from the CLI

```{r exdot, engine='dot'}
digraph test {
  main -> "subproject #3" -> c;
  a -> z -> d -> c;
  c -> a;
  c -> z;
  f;
  b -> d;
  c -> d;
  d -> end;
  {rank=same; a z d}
}

```

Error Output

processing file: Using_Graphviz.Rmd
running: "dot" ".\codeee454e538c9" -Tpdf -o"./Using_Graphviz_files/figure-latex/exdot-1.pdf"
Error: Could not open "./Using_Graphviz_files/figure-latex/exdot-1.pdf" for writing : No such file or directory
Quitting from lines 7-19 (Using_Graphviz.Rmd) 
Error in (knit_engines$get(options$engine))(options) : 
  failed to compile content
Calls: <Anonymous> ... process_group.block -> call_block -> block_exec -> in_dir -> <Anonymous>
In addition: Warning message:
running command '"dot" ".\codeee454e538c9" -Tpdf -o"./Using_Graphviz_files/figure-latex/exdot-1.pdf"' had status 1 

Execution halted

SUCCESS

---
output: pdf_document

---
This relies upon Graphviz already being installed and launchable from the CLI

```{r}
plot(runif(10))
```
```{r exdot, engine='dot'}
digraph test {
  main -> "subproject #3" -> c;
  a -> z -> d -> c;
  c -> a;
  c -> z;
  f;
  b -> d;
  c -> d;
  d -> end;
  {rank=same; a z d}
}

```

System Config

> session_info()
Session info---------------------------------------------------------------------------------
 setting  value                       
 version  R version 3.1.1 (2014-07-10)
 system   i386, mingw32               
 ui       RStudio (0.98.1062)         
 language (EN)                        
 collate  English_United States.1252  
 tz       America/New_York            

Packages-------------------------------------------------------------------------------------
 package    * version  date       source                            
 devtools   * 1.6.1    2014-10-07 CRAN (R 3.1.1)                    
 digest       0.6.4    2013-12-03 CRAN (R 3.1.0)                    
 htmltools    0.2.6    2014-09-08 CRAN (R 3.1.1)                    
 httr         0.5      2014-09-02 CRAN (R 3.1.1)                    
 RCurl        1.95.4.3 2014-07-29 CRAN (R 3.1.1)                    
 rmarkdown    0.3.3    2014-09-29 Github (rstudio/rmarkdown@fd8dafd)
 rstudioapi   0.1      2014-03-27 CRAN (R 3.1.1)                    
 stringr      0.6.2    2012-12-06 CRAN (R 3.1.0)                    
 yaml         2.1.13   2014-06-12 CRAN (R 3.1.0)                    

[yihui]

Thanks! It should be fixed now.

[github-actions]

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