man: move more examples to stand-alone files and use 2-space indentation consistenty

Moving them out makes it easier to run them through a compiler, use automatic
indentation, and opens the possibility to provide a download link in the
future. I verified that all examples compile cleanly.

(2-space indentation is used because the examples are already significantly
indented in the man page, and we need to keep them narrow so that they display
well on standard terminals.)

1 files changed, 1 insertions, 26 deletions

diff --git a/man/sd_journal_query_unique.xml b/man/sd_journal_query_unique.xml
index 0bbc479f22..c62f333eab 100644
--- a/man/sd_journal_query_unique.xml
+++ b/man/sd_journal_query_unique.xml
@@ -140,32 +140,7 @@
     following example lists all unit names referenced in the
     journal:</para>
 
-    <programlisting>#include &lt;stdio.h&gt;
-#include &lt;string.h&gt;
-#include &lt;systemd/sd-journal.h&gt;
-
-int main(int argc, char *argv[]) {
-        sd_journal *j;
-        const void *d;
-        size_t l;
-        int r;
-
-        r = sd_journal_open(&amp;j, SD_JOURNAL_LOCAL_ONLY);
-        if (r &lt; 0) {
-                fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
-                return 1;
-        }
-        r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
-        if (r &lt; 0) {
-                fprintf(stderr, "Failed to query journal: %s\n", strerror(-r));
-                return 1;
-        }
-        SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
-                printf("%.*s\n", (int) l, (const char*) d);
-        sd_journal_close(j);
-        return 0;
-}</programlisting>
-
+    <programlisting><xi:include href="journal-iterate-unique.c" parse="text" /></programlisting>
   </refsect1>
 
   <refsect1>