add makefile rule for completions

add fish to docs

Author: TheFox0x7

Makefile

@@ -915,6 +915,13 @@ generate-manpage: ## generate manpage
 	@gzip -9 man/man1/gitea.1 && echo man/man1/gitea.1.gz created
 	@#TODO A small script that formats config-cheat-sheet.en-us.md nicely for use as a config man page
 
+.PHONY: generate-completions
+generate-completions: ## generate shell completions
+	@[ -f gitea ]  || make backend
+	@./gitea completion bash > contrib/autocompletion/bash_autocomplete
+	@./gitea completion zsh  > contrib/autocompletion/zsh_autocomplete
+	@./gitea completion fish > contrib/autocompletion/gitea.fish
+
 .PHONY: docker
 docker:
 	docker build --disable-content-trust=false -t $(DOCKER_REF) .

contrib/autocompletion/README

@@ -7,11 +7,17 @@ From within the gitea root run:
 source contrib/autocompletion/bash_autocomplete
 ```
 
-or for zsh run:
+for zsh run:
 
-```bash
+```zsh
 source contrib/autocompletion/zsh_autocomplete
 ```
 
+and for fish:
+
+```fish
+source contrib/autocompletion/gitea.fish
+```
+
 These scripts will check if gitea is on the path and if so add autocompletion for `gitea`. Or if not autocompletion will work for `./gitea`.
 If gitea has been installed as a different program pass in the `PROG` environment variable to set the correct program name.