Merge pull request cli#2455 from ismaell/install-target

Add make (un)install targets for POSIX systems 

Fixes cli#293

Makefile

@@ -58,7 +58,22 @@ endif
 	git -C site commit -m '$(GITHUB_REF:refs/tags/v%=%)' index.html
 .PHONY: site-bump
 
-
 .PHONY: manpages
 manpages:
 	go run ./cmd/gen-docs --man-page --doc-path ./share/man/man1/
+
+DESTDIR :=
+prefix  := /usr/local
+bindir  := ${prefix}/bin
+mandir  := ${prefix}/share/man
+
+.PHONY: install
+install: bin/gh manpages
+	install -d ${DESTDIR}${bindir}
+	install -m755 bin/gh ${DESTDIR}${bindir}/
+	install -d ${DESTDIR}${mandir}/man1
+	install -m644 ./share/man/man1/* ${DESTDIR}${mandir}/man1/
+
+.PHONY: uninstall
+uninstall:
+	rm -f ${DESTDIR}${bindir}/gh ${DESTDIR}${mandir}/man1/gh.1 ${DESTDIR}${mandir}/man1/gh-*.1

docs/source.md

@@ -15,16 +15,18 @@
    $ cd gh-cli
    ```
 
-2. Build the project
+2. Build and install
 
-   ```
-   $ make
+   ```sh
+   # installs to '/usr/local' by default; sudo may be required
+   $ make install
    ```
 
-3. Move the resulting `bin/gh` executable to somewhere in your PATH
-
+   To install to a different location:
    ```sh
-   $ sudo mv ./bin/gh /usr/local/bin/
+   $ make install prefix=/path/to/gh
    ```
 
-4. Run `gh version` to check if it worked.
+   Make sure that the `${prefix}/bin` directory is in your PATH.
+
+3. Run `gh version` to check if it worked.