Document temporary file extension behavior when using template (jrnl-…

…org#1686)

* Document jrnl's temp file behavior when using templates
* Move up "Files in transit from editor to jrnl" section and add notes about template extension behavior in solutions that reference .jrnl extension
* Update privacy-and-security.md

docs/privacy-and-security.md

@@ -67,6 +67,22 @@ Windows doesn't log history to disk, but it does keep it in your command prompt
 session. Close the command prompt or press `Alt`+`F7` to clear your history
 after journaling.
 
+## Files in transit from editor to jrnl
+
+When creating or editing an entry, `jrnl` uses a unencrypted temporary file on
+disk in order to give your editor access to your journal. After you close your
+editor, `jrnl` then deletes this temporary file.
+
+So, if you have saved a journal entry but haven't closed your editor yet, the
+unencrypted temporary remains on your disk. If your computer were to shut off
+during this time, or the `jrnl` process were killed unexpectedly, then the
+unencrypted temporary file will remain on your disk. You can mitigate this
+issue by only saving with your editor right before closing it. You can also
+manually delete these files from your temporary folder. By default, they
+are named `jrnl*.jrnl`, but if you use a
+[template](reference-config-file.md#template), they will have the same
+extension as the template.
+
 ## Editor history
 
 Some editors keep usage history stored on disk for future use. This can be a
@@ -83,7 +99,8 @@ the `workbench.localHistory.enabled` setting in the
 Alternatively, you can disable this feature for specific files by configuring a
 [pattern](https://code.visualstudio.com/docs/editor/codebasics#_advanced-search-options)
 in the `workbench.localHistory.exclude` setting. To exclude unencrypted temporary files generated
-by `jrnl`, you can set the `**/jrnl*.jrnl` pattern for the `workbench.localHistory.exclude` setting
+by `jrnl`, you can set the `**/jrnl*.jrnl` (unless you are using a
+[template](reference-config-file.md#template)) pattern for the `workbench.localHistory.exclude` setting
 in the [Settings editor](https://code.visualstudio.com/docs/getstarted/settings#_settings-editor).
 
 !!! note
@@ -129,7 +146,11 @@ autocommand can be used. Place this in your `~/.vimrc`:
 autocmd BufNewFile,BufReadPre *.jrnl setlocal viminfo= noswapfile noundofile nobackup nowritebackup noshelltemp history=0 nomodeline secure
 ```
 
-Please see `:h <option>` in Vim for more information about the options mentioned.
+!!! note
+    If you're using a [template](reference-config-file.md#template), you will
+    have to use the template's file extension instead of `.jrnl`.
+
+See `:h <option>` in Vim for more information about the options mentioned.
 
 ### Neovim
 
@@ -171,21 +192,11 @@ vim.api.nvim_create_autocmd( {"BufNewFile","BufReadPre" }, {
 })
 ```
 
-Please see `:h <option>` in Neovim for more information about the options mentioned.
-
-## Files in transit from editor to jrnl
-
-When creating or editing an entry, `jrnl` uses a unencrypted temporary file on
-disk in order to give your editor access to your journal. After you close your
-editor, `jrnl` then deletes this temporary file.
+!!! note
+    If you're using a [template](reference-config-file.md#template), you will
+    have to use the template's file extension instead of `.jrnl`.
 
-So, if you have saved a journal entry but haven't closed your editor yet, the
-unencrypted temporary remains on your disk. If your computer were to shut off
-during this time, or the `jrnl` process were killed unexpectedly, then the
-unencrypted temporary file will remain on your disk. You can mitigate this
-issue by only saving with your editor right before closing it. You can also
-manually delete these files (i.e. files named `jrnl*.jrnl`) from your temporary
-folder.
+Please see `:h <option>` in Neovim for more information about the options mentioned.
 
 ## Plausible deniability
 

docs/reference-config-file.md

@@ -59,7 +59,9 @@ value for journals that already have data in them.
 
 ### template
 The path to a text file to use as a template for new entries. Only works when you
-have the `editor` field configured.
+have the `editor` field configured. If you use a template, the editor's
+[temporary files](privacy-and-security.md#files-in-transit-from-editor-to-jrnl)
+will have the same extension as the template.
 
 ### tagsymbols
 Symbols to be interpreted as tags.