well, let's try outputting qgis_process stuff

10-gis.Rmd

@@ -24,8 +24,7 @@ library(gdalcubes)
 ```{r 09-gis-1-3, echo=FALSE, message=FALSE}
 # Only run code if qgis is installed
 has_qgis = FALSE
-qgisprocess_installed = "qgisprocess" %in% installed.packages()
-if(qgisprocess_installed) {
+if ("qgisprocess" %in% installed.packages()) {
   has_qgis = qgisprocess::has_qgis()
 }
 ```
@@ -239,9 +238,8 @@ qgis_algo = qgis_algorithms()
 The `qgis_algo` object has a lot of columns, but usually, we are only interested in the `algorithm` column that combines information about the provider and the algorithm name.
 Assuming that the short description of the function contains the word "union"\index{union}, we can run the following code to find the algorithm of interest:
 
-```{r, eval=FALSE}
+```{r, eval=has_qgis}
 grep("union", qgis_algo$algorithm, value = TRUE)
-#> [1] "native:multiunion" "native:union"      "sagang:fuzzyunionor" "sagang:polygonunion"
 ```
 
 One of the algorithms on the above list, `"native:union"`, sounds promising.