home-manager: support --log-format flag (#6093)

You can now pass `--log-format FORMAT` to `nix-build`,
useful for piping into `nix-output-monitor`.

docs/home-manager.1

@@ -45,6 +45,7 @@
 .Op Fl -keep-failed
 .Op Fl -keep-going
 .Op Bro Fl L | Fl -print-build-logs Brc
+.Op Fl -log-format
 .Op Fl -show-trace
 .Op Fl -(no-)substitute
 .Op Fl -no-out-link
@@ -335,6 +336,13 @@ when building from a flake\&.
 .RE
 .Pp
 
+.It Cm Fl -log-format Ar format
+.RS 4
+Passed on to
+\fBnix-build\fR(1)\&.
+.RE
+.Pp
+
 .It Cm Fl -show-trace
 .RS 4
 Passed on to

home-manager/home-manager

@@ -907,6 +907,7 @@ function doHelp() {
     echo "  -j, --max-jobs NUM"
     echo "  --option NAME VALUE"
     echo "  -L, --print-build-logs"
+    echo "  --log-format FORMAT"
     echo "  --show-trace"
     echo "  --(no-)substitute"
     echo "  --no-out-link            Do not create a symlink to the output path"
@@ -1036,7 +1037,7 @@ while [[ $# -gt 0 ]]; do
             PASSTHROUGH_OPTS+=("$opt" "$1" "$2")
             shift 2
             ;;
-        -j|--max-jobs|--cores|--builders)
+        -j|--max-jobs|--cores|--builders|--log-format)
             [[ -v 1 && $1 != -* ]] || errMissingOptArg "$opt"
             PASSTHROUGH_OPTS+=("$opt" "$1")
             shift