update tutorial

.gitattributes

@@ -0,0 +1 @@
+* text eol=lf

README.md

@@ -20,7 +20,7 @@ To improve the tutorial, edit [`tutorial.md`](./tutorial.md).
 ## Mappings
 
 Mappings found in
-[the `inst/mappings` folder](https://github.com/pik-piam/piamInterfaces/tree/master/inst/mappings)
+the [`inst/mappings`](https://github.com/pik-piam/piamInterfaces/tree/master/inst/mappings) folder
 serve to map variables from the PIAM framework to variables needed for the submission to databases.
 The mappings are `;`-separated files, using `#` as comment character, with the following mandatory columns:
 
@@ -48,22 +48,27 @@ Additionally, some mappings use those columns:
 
 ### Editing a mapping
 
-To edit a mapping in `R`, use:
+You can use a text editor, `R` or a spreadsheet editor to adjust the mappings.
+
+For `R`, use:
 ```
 mappingdata <- getMapping("AR6")
-...
+... whatever data.frame operations you want ...
 write.table(mappingdata, "inst/mappings/test_mapping.csv", na = "",  dec = ".", sep = ";", row.names = FALSE, quote = FALSE)
 ```
 
-Opening the csv files in Excel can be problematic, as it sometimes changes values and quotation marks.
-You can edit the files in LibreOffice Calc using these settings in the Text Import dialog:
-- Text Import with:
+Using `Excel` can be problematic, as it sometimes changes values and quotation marks.
+
+For `LibreOffice Calc`, use these settings:
+```
+Text Import:
   - Character set: Unicode (UTF-8)
   - Separated by: Semicolon.
-- Save with:
+Save -> Edit filter settings:
   - Character set: Unicode (UTF-8)
   - Field Delimiter: ;
   - String Delimiter: (none)
+```
 
 The github diff on a large semicolon-separated file is often unreadable.
 For a human-readable output, save the old version of the mapping and run:
@@ -74,15 +79,15 @@ On the PIK cluster, you can run `comparescenconf mapping_AR6.csv` in the `inst/m
 
 After you adjusted the mapping, run `make test` on Linux (incl. the cluster) or `Rscript -e 'devtools::test(show_report = TRUE)'` on Windows, and various tests will be performed.
 
-### Renaming a piam_variable
+#### Renaming a piam_variable
 
 If a variable used as `piam_variable` has to be renamed, please add it with its `old_name` to [`inst/renamed_piam_variables.csv`](./inst/renamed_piam_variables.csv).
 Like this, if someone arrives with a dataset that contains the old name but not the new, [`renameOldVariables()`](./R/renameOldVariables.R) makes sure the data is automatically adjusted.
 [`test-renameOldVariables.R`](./tests/testthat/test-renameOldVariables.R) enforces that the old variable name is not used anywhere in the mappings.
 To adjust the mappings automatically, make sure you commit the current state to be able to reset its results, and then run `Rscript -e "devtools::load_all(); renameOldInMappings()"`.
 Check the `diff` carefully, for example using `comparescenconf`, see above.
 
-### piam_factor and unit checks
+#### piam_factor and unit checks
 
 While running the tests, an extensive check of the compatibility of `piam_unit`, `unit` and `piam_factor` is performed in each mapping.
 It helps to find mismatches, for example mapping `Mt` to `Gt` with a factor of `1` or mapping `US$2005` to `US$2017` without accounting for inflation.

tutorial.md

@@ -11,7 +11,7 @@ To improve the tutorial, edit [`tutorial.md`](./tutorial.md).
 ## Mappings
 
 Mappings found in
-[the `inst/mappings` folder](https://github.com/pik-piam/piamInterfaces/tree/master/inst/mappings)
+the [`inst/mappings`](https://github.com/pik-piam/piamInterfaces/tree/master/inst/mappings) folder
 serve to map variables from the PIAM framework to variables needed for the submission to databases.
 The mappings are `;`-separated files, using `#` as comment character, with the following mandatory columns:
 
@@ -39,22 +39,27 @@ Additionally, some mappings use those columns:
 
 ### Editing a mapping
 
-To edit a mapping in `R`, use:
+You can use a text editor, `R` or a spreadsheet editor to adjust the mappings.
+
+For `R`, use:
 ```
 mappingdata <- getMapping("AR6")
-...
+... whatever data.frame operations you want ...
 write.table(mappingdata, "inst/mappings/test_mapping.csv", na = "",  dec = ".", sep = ";", row.names = FALSE, quote = FALSE)
 ```
 
-Opening the csv files in Excel can be problematic, as it sometimes changes values and quotation marks.
-You can edit the files in LibreOffice Calc using these settings in the Text Import dialog:
-- Text Import with:
+Using `Excel` can be problematic, as it sometimes changes values and quotation marks.
+
+For `LibreOffice Calc`, use these settings:
+```
+Text Import:
   - Character set: Unicode (UTF-8)
   - Separated by: Semicolon.
-- Save with:
+Save -> Edit filter settings:
   - Character set: Unicode (UTF-8)
   - Field Delimiter: ;
   - String Delimiter: (none)
+```
 
 The github diff on a large semicolon-separated file is often unreadable.
 For a human-readable output, save the old version of the mapping and run:
@@ -65,15 +70,15 @@ On the PIK cluster, you can run `comparescenconf mapping_AR6.csv` in the `inst/m
 
 After you adjusted the mapping, run `make test` on Linux (incl. the cluster) or `Rscript -e 'devtools::test(show_report = TRUE)'` on Windows, and various tests will be performed.
 
-### Renaming a piam_variable
+#### Renaming a piam_variable
 
 If a variable used as `piam_variable` has to be renamed, please add it with its `old_name` to [`inst/renamed_piam_variables.csv`](./inst/renamed_piam_variables.csv).
 Like this, if someone arrives with a dataset that contains the old name but not the new, [`renameOldVariables()`](./R/renameOldVariables.R) makes sure the data is automatically adjusted.
 [`test-renameOldVariables.R`](./tests/testthat/test-renameOldVariables.R) enforces that the old variable name is not used anywhere in the mappings.
 To adjust the mappings automatically, make sure you commit the current state to be able to reset its results, and then run `Rscript -e "devtools::load_all(); renameOldInMappings()"`.
 Check the `diff` carefully, for example using `comparescenconf`, see above.
 
-### piam_factor and unit checks
+#### piam_factor and unit checks
 
 While running the tests, an extensive check of the compatibility of `piam_unit`, `unit` and `piam_factor` is performed in each mapping.
 It helps to find mismatches, for example mapping `Mt` to `Gt` with a factor of `1` or mapping `US$2005` to `US$2017` without accounting for inflation.