Add a hostname override

Based on issue #82, we now provide `-B` to override the hostname. In
particular:

- `mkrc -B foo` will enable `-o` but with the hostname set up `foo`.
- `lsrc -B foo` will work like normal `lsrc` except it treats `host-foo`
as the host-specific directory.
- `rcup -B foo` will run a normal `rcup` except `host-foo` is the
host-specific directory.
- `rcdn -B foo` is just like normal `rcdn`, but with `host-foo` as the
  host-specific directory.

The `HOSTNAME` can also be set in the rcrc(5), and this is overridden by
the aforementioned `-B`.

While making this change: The `test/Makefile.am` used a mix of tabs and
spaces. Since it's a Makefile, replace it all with tabs.

6 files changed, 34 insertions, 0 deletions

diff --git a/man/lsrc.1 b/man/lsrc.1
index 22920f4..a0d096c 100644
--- a/man/lsrc.1
+++ b/man/lsrc.1
@@ -12,6 +12,7 @@
 .Op Fl t Ar tag
 .Op Fl x Ar excl_pat
 .Op Fl N Ar excl_pat
+.Op Fl B Ar hostname
 .Op files ...
 .Sh DESCRIPTION
 This program lists all configuration files, both the sources in the
@@ -26,6 +27,11 @@ section, for details on the directory layout.
 It supports these options:
 .
 .Bl -tag -width "-I excl_pat"
+.It Fl B Ar HOSTNAME
+treat
+.Pa host-HOSTNAME
+as the host-specific directory instead of computing it based on the
+computer's hostname
 .It Fl d Ar DIR
 list dotfiles from the DIR. This can be specified multiple times.
 .
diff --git a/man/mkrc.1 b/man/mkrc.1
index 4e274bf..3101839 100644
--- a/man/mkrc.1
+++ b/man/mkrc.1
@@ -9,6 +9,7 @@
 .Op Fl Cvqo
 .Op Fl t Ar tag
 .Op Fl d Ar dir
+.Op Fl B Ar hostname
 .Ar files ...
 .Sh DESCRIPTION
 This program adds files to your dotfiles directory then installs it
@@ -18,6 +19,9 @@ different source directory.
 It supports these options:
 .
 .Bl -tag -width "-d DIR"
+.It Fl B Ar HOSTNAME
+use the supplied hostname instead of computing one. Implies
+.Fl o .
 .It Fl C
 copy instead of symlinking when installing the rc file back into your
 home directory
diff --git a/man/rcdn.1 b/man/rcdn.1
index fa0b60b..b7f7554 100644
--- a/man/rcdn.1
+++ b/man/rcdn.1
@@ -7,6 +7,7 @@
 .Sh SYNOPSIS
 .Nm rcdn
 .Op Fl kKvq
+.Op Fl B Ar hostname
 .Op Fl d Ar dir
 .Op Fl I Ar excl_pat
 .Op Fl t Ar tag
@@ -43,6 +44,10 @@ These hooks are run each time
 is run and therefore must be idempotent.
 .
 .Bl -tag -width "-I EXCL_PAT"
+.It Fl B Ar HOSTNAME
+treat
+.Pa host-HOSTNAME
+as the host-specific directory instead of computing it
 .It Fl d Ar DIR
 remove rc files from the
 .Ar DIR .
diff --git a/man/rcm.7.mustache b/man/rcm.7.mustache
index 8956e5d..36dec50 100644
--- a/man/rcm.7.mustache
+++ b/man/rcm.7.mustache
@@ -213,6 +213,13 @@ dotfile directories listed in there are often specific to a single
 machine.
 .Pp
 .Dl mkrc -o .rcrc
+.Pp
+If your hostname is difficult to compute, or you otherwise want to use a
+different hostname, you can use the
+.Fl B
+flag.
+.Pp
+.Dl mkrc -B eggplant .rcrc
 .
 .Sh RATIONALE
 The rcm suite was built as an abstraction over the shell, Ruby, Python,
diff --git a/man/rcrc.5 b/man/rcrc.5
index 3872795..bc72329 100644
--- a/man/rcrc.5
+++ b/man/rcrc.5
@@ -44,6 +44,12 @@ explained in detail in
 under the section
 .Sx EXCLUDE PATTERN .
 .
+.It Va HOSTNAME
+the hostname for this computer. This is normally computed using the
+.Xr hostname 1
+command, but this command is non-standard and can prove unreliable. The
+.Va HOSTNAME
+variable forces a known hostname.
 .It Va TAGS
 the default tags.
 .
@@ -62,6 +68,7 @@ under the section
 .Dl COPY_ALWAYS="*"
 .Dl DOTFILES_DIRS="/home/mike/.dotfiles /usr/share/dotfiles"
 .Dl EXCLUDES="irbrc *:*emacs* dotfiles:python*"
+.Dl HOSTNAME="eggplant"
 .Dl TAGS="freebsd development email git laptop gmail notmuch"
 .Dl SYMLINK_DIRS="zprezto"
 .Sh SEE ALSO
diff --git a/man/rcup.1 b/man/rcup.1
index 60e36ae..b487987 100644
--- a/man/rcup.1
+++ b/man/rcup.1
@@ -7,6 +7,7 @@
 .Sh SYNOPSIS
 .Nm rcup
 .Op Fl CfikKqv
+.Op Fl B Ar hostname
 .Op Fl d Ar dir
 .Op Fl I Ar excl_pat
 .Op Fl t Ar tag
@@ -25,6 +26,10 @@ for details on the directory layout.
 .Pp
 It supports these options:
 .Bl -tag -width "-x EXCL_PAT"
+.It Fl B Ar HOSTNAME
+treat
+.Pa host-HOSTNAME
+as the host-specific directory instead of computing it
 .It Fl C
 copy the files instead of symlinking them
 .It Fl d Ar DIR