makefile: fix lib/transform docs not getting updated

As of
4280ec75cc
the lib/transform docs are generated with //go:generate and embedded with
//go:embed.

Before this change, however, they were not getting automatically updated with
subsequent changes (like
fe62a2bb4e)
because `go generate ./lib/transform` was not being run as part of the release
making process.

This change fixes that by running it in `make commanddocs`.

Makefile

@@ -145,6 +145,7 @@ MANUAL.txt:	MANUAL.md
 	pandoc -s --from markdown-smart --to plain MANUAL.md -o MANUAL.txt
 
 commanddocs: rclone
+	go generate ./lib/transform
 	-@rmdir -p '$$HOME/.config/rclone'
 	XDG_CACHE_HOME="" XDG_CONFIG_HOME="" HOME="\$$HOME" USER="\$$USER" rclone gendocs --config=/notfound docs/content/
 	@[ ! -e '$$HOME' ] || (echo 'Error: created unwanted directory named $$HOME' && exit 1)

lib/transform/transform.md

@@ -11,6 +11,9 @@
 | `--name-transform replace=old:new` | Replaces occurrences of old with new in the file name. |
 | `--name-transform date={YYYYMMDD}` | Appends or prefixes the specified date format. |
 | `--name-transform truncate=N` | Truncates the file name to a maximum of N characters. |
+| `--name-transform truncate_keep_extension=N` | Truncates the file name to a maximum of N characters while preserving the original file extension. |
+| `--name-transform truncate_bytes=N` | Truncates the file name to a maximum of N bytes (not characters). |
+| `--name-transform truncate_bytes_keep_extension=N` | Truncates the file name to a maximum of N bytes (not characters) while preserving the original file extension. |
 | `--name-transform base64encode` | Encodes the file name in Base64. |
 | `--name-transform base64decode` | Decodes a Base64-encoded file name. |
 | `--name-transform encoder=ENCODING` | Converts the file name to the specified encoding (e.g., ISO-8859-1, Windows-1252, Macintosh). |
@@ -25,11 +28,11 @@
 | `--name-transform nfd` | Converts the file name to NFD Unicode normalization form. |
 | `--name-transform nfkc` | Converts the file name to NFKC Unicode normalization form. |
 | `--name-transform nfkd` | Converts the file name to NFKD Unicode normalization form. |
-| `--name-transform command=/path/to/my/programfile names.` | Executes an external program to transform |
-
+| `--name-transform command=/path/to/my/programfile names.` | Executes an external program to transform. |
 
 Conversion modes:
-```
+
+```text
 none
 nfc
 nfd
@@ -44,6 +47,9 @@ trimsuffix
 index
 date
 truncate
+truncate_keep_extension
+truncate_bytes
+truncate_bytes_keep_extension
 base64encode
 base64decode
 encoder
@@ -60,9 +66,10 @@ url
 regex
 command
 ```
-Char maps:  
-```
 
+Char maps:
+
+```text
 IBM-Code-Page-037
 IBM-Code-Page-437
 IBM-Code-Page-850
@@ -106,119 +113,120 @@ Windows-1257
 Windows-1258
 X-User-Defined
 ```
+
 Encoding masks:
-```
+
+```text
 Asterisk
- BackQuote  
- BackSlash  
- Colon  
- CrLf  
- Ctl  
- Del  
- Dollar  
- Dot  
- DoubleQuote  
- Exclamation  
- Hash  
- InvalidUtf8  
- LeftCrLfHtVt  
- LeftPeriod  
- LeftSpace  
- LeftTilde  
- LtGt  
- None  
- Percent  
- Pipe  
- Question  
- Raw  
- RightCrLfHtVt  
- RightPeriod  
- RightSpace  
- Semicolon  
- SingleQuote  
- Slash  
- SquareBracket  
+BackQuote
+BackSlash
+Colon
+CrLf
+Ctl
+Del
+Dollar
+Dot
+DoubleQuote
+Exclamation
+Hash
+InvalidUtf8
+LeftCrLfHtVt
+LeftPeriod
+LeftSpace
+LeftTilde
+LtGt
+None
+Percent
+Pipe
+Question
+Raw
+RightCrLfHtVt
+RightPeriod
+RightSpace
+Semicolon
+SingleQuote
+Slash
+SquareBracket
 ```
+
 Examples:
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,uppercase"
 // Output: STORIES/THE QUICK BROWN FOX!.TXT
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,replace=Fox:Turtle" --name-transform "all,replace=Quick:Slow"
 // Output: stories/The Slow Brown Turtle!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,base64encode"
 // Output: c3Rvcmllcw==/VGhlIFF1aWNrIEJyb3duIEZveCEudHh0
 ```
 
-```
+```sh
 rclone convmv "c3Rvcmllcw==/VGhlIFF1aWNrIEJyb3duIEZveCEudHh0" --name-transform "all,base64decode"
 // Output: stories/The Quick Brown Fox!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown 🦊 Fox Went to the Café!.txt" --name-transform "all,nfc"
 // Output: stories/The Quick Brown 🦊 Fox Went to the Café!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown 🦊 Fox Went to the Café!.txt" --name-transform "all,nfd"
 // Output: stories/The Quick Brown 🦊 Fox Went to the Café!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown 🦊 Fox!.txt" --name-transform "all,ascii"
 // Output: stories/The Quick Brown  Fox!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,trimsuffix=.txt"
 // Output: stories/The Quick Brown Fox!
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,prefix=OLD_"
 // Output: OLD_stories/OLD_The Quick Brown Fox!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown 🦊 Fox Went to the Café!.txt" --name-transform "all,charmap=ISO-8859-7"
 // Output: stories/The Quick Brown _ Fox Went to the Caf_!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox: A Memoir [draft].txt" --name-transform "all,encoder=Colon,SquareBracket"
 // Output: stories/The Quick Brown Fox： A Memoir ［draft］.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown 🦊 Fox Went to the Café!.txt" --name-transform "all,truncate=21"
 // Output: stories/The Quick Brown 🦊 Fox
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,command=echo"
 // Output: stories/The Quick Brown Fox!.txt
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!" --name-transform "date=-{YYYYMMDD}"
-// Output: stories/The Quick Brown Fox!-20250618
+// Output: stories/The Quick Brown Fox!-20250830
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!" --name-transform "date=-{macfriendlytime}"
-// Output: stories/The Quick Brown Fox!-2025-06-18 0148PM
+// Output: stories/The Quick Brown Fox!-2025-08-30 1234AM
 ```
 
-```
+```sh
 rclone convmv "stories/The Quick Brown Fox!.txt" --name-transform "all,regex=[\\.\\w]/ab"
 // Output: ababababababab/ababab ababababab ababababab ababab!abababab
 ```
-
-