find: add `--hashes` shortcut for piping to other commands (#38663)

People frequently ask us how to pipe `spack find` output to other commands, and we tell
them to do things like this:

```console
$ spack find --format "/{hash}" | spack uninstall -ay
```

Sometimes users don't know about hash references and come up with potentially ambiguous
formulations like this:

```console
spack find --format {name}@{version}%{compiler} | spack uninstall -ay
```

Since this is a common enough thing to want to do, and to make it more obvious how, this
PR adds a `-H` / `--hashes` as a shortcut, so you can now just do:

```console
spack find -H | spack uninstall -ay
```

2 files changed, 9 insertions, 1 deletions

diff --git a/lib/spack/spack/cmd/find.py b/lib/spack/spack/cmd/find.py
index f7bd56db19..15ea5c7709 100644
--- a/lib/spack/spack/cmd/find.py
+++ b/lib/spack/spack/cmd/find.py
@@ -31,6 +31,14 @@ def setup_parser(subparser):
         help="output specs with the specified format string",
     )
     format_group.add_argument(
+        "-H",
+        "--hashes",
+        action="store_const",
+        dest="format",
+        const="{/hash}",
+        help="same as '--format {/hash}'; use with xargs or $()",
+    )
+    format_group.add_argument(
         "--json",
         action="store_true",
         default=False,
diff --git a/share/spack/spack-completion.bash b/share/spack/spack-completion.bash
index 2e98698e0f..959e4924f2 100755
--- a/share/spack/spack-completion.bash
+++ b/share/spack/spack-completion.bash
@@ -1075,7 +1075,7 @@ _spack_fetch() {
 _spack_find() {
     if $list_options
     then
-        SPACK_COMPREPLY="-h --help --format --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated -N --namespace --start-date --end-date"
+        SPACK_COMPREPLY="-h --help --format -H --hashes --json -d --deps -p --paths --groups --no-groups -l --long -L --very-long -t --tag -c --show-concretized -f --show-flags --show-full-compiler -x --explicit -X --implicit -u --unknown -m --missing -v --variants --loaded -M --only-missing --deprecated --only-deprecated -N --namespace --start-date --end-date"
     else
         _installed_packages
     fi