notify user when no docsets installed for searching

Author: sunaku

bin/dasht

@@ -53,6 +53,9 @@
 # 44
 #   No results were found.
 #
+# 45
+#   No docsets were installed for searching.
+#
 # ## SEE ALSO
 #
 # w3m(1), dasht-query-html(1), dasht-docsets(1), [Dash]
@@ -64,10 +67,22 @@
 # Written in 2016 by Suraj N. Kurapati <https://github.com/sunaku/dasht>
 # Distributed under the terms of the ISC license (see the LICENSE file).
 
+if test $# -gt 0; then
+  pattern=$1
+  shift
+fi
+
+count=$(dasht-docsets "$@" | wc -l)
+if test $count -eq 0; then
+  # notify user when no docsets are installed so they can go install them
+  echo "dasht: '$*' docsets not installed so '$pattern' not searched" >&2
+  exit 45
+fi
+
 trap 'exit 44' USR1 # exit with a nonzero status when no results are found
-if ! dasht-query-html "$@"; then
+if ! dasht-query-html "$pattern" "$@"; then
   # notify user when no results are found so they can refine their search
-  pat=$1; shift; echo "dasht: '$pat' not found in ${*:-any} docsets" >&2
+  echo "dasht: '$pattern' not found in $count docsets matching '${*:-.*}'" >&2
 
   # emulate pipefail (which POSIX lacks) by killing off the w3m(1) process
   # below (which starts up simultaneously alongside this pipeline segment)

bin/dasht-server-http

@@ -181,8 +181,13 @@ cat <<HEADER
     <br>
 HEADER
 
-dasht-query-html "$query" $docsets ||
-echo "<h1><i>$query_html</i> not found in ${docsets_html:-any} docsets</h1>"
+if test $1 -eq 0; then
+  # notify user when no docsets are installed so they can go install them
+  echo "<h1><i>${docsets_html}</i> docsets not installed so <i>$query_html</i> not searched</h1>"
+elif ! dasht-query-html "$query" $docsets; then
+  # notify user when no results are found so they can refine their search
+  echo "<h1><i>$query_html</i> not found in $1 docsets matching <i>${docsets_html:-.*}</i></h1>"
+fi
 
 cat <<FOOTER
   </body>

man/man1/dasht.1

@@ -47,6 +47,9 @@ or, if \fB\fCXDG_DATA_HOME\fR is undefined, \fB\fC$HOME/.local/share/dasht/docse
 .TP
 44
 No results were found.
+.TP
+45
+No docsets were installed for searching.
 .SH SEE ALSO
 .PP
 .BR w3m (1),