haddock-project: added `--all` switch

Added `--all` (`--haddock-all`) switches for compatibility with
`haddock` command.  `--haddock-all` alias is added, since that's what is
suggested by some warning messages.

Fixes #10051

Cabal/src/Distribution/Simple/Setup/Haddock.hs

@@ -584,6 +584,27 @@ haddockProjectOptions _showOrParseArgs =
       haddockProjectForeignLibs
       (\v flags -> flags{haddockProjectForeignLibs = v})
       trueArg
+  , option
+      ""
+      ["all", "haddock-all"]
+      "Run haddock for all targets"
+      ( \f ->
+          allFlags
+            [ haddockProjectExecutables f
+            , haddockProjectTestSuites f
+            , haddockProjectBenchmarks f
+            , haddockProjectForeignLibs f
+            ]
+      )
+      ( \v flags ->
+          flags
+            { haddockProjectExecutables = v
+            , haddockProjectTestSuites = v
+            , haddockProjectBenchmarks = v
+            , haddockProjectForeignLibs = v
+            }
+      )
+      trueArg
   , option
       ""
       ["internal"]

changelog.d/issue-10051

+synopsis: Added `--all` and `--haddock-all` switches to `haddock-project` subcommand
+packages: cabal-install
+issues: #10051
+prs: #2272