1 files changed, 49 insertions, 0 deletions
diff --git a/clients/grepclient.go b/clients/grepclient.go
new file mode 100644
index 0000000..dbae96c
--- /dev/null
+++ b/clients/grepclient.go
@@ -0,0 +1,49 @@
+package clients
+
+import (
+	"dtail/clients/handlers"
+	"dtail/clients/remote"
+	"dtail/ssh/client"
+	"errors"
+	"fmt"
+	"strings"
+
+	gossh "golang.org/x/crypto/ssh"
+)
+
+// GrepClient searches a remote file for all lines matching a regular expression. Only the matching lines are displayed.
+type GrepClient struct {
+	baseClient
+}
+
+// NewGrepClient creates a new grep client.
+func NewGrepClient(args Args) (*GrepClient, error) {
+	if args.Regex == "" {
+		return nil, errors.New("No regex specified, use '-regex' flag")
+	}
+
+	c := GrepClient{
+		baseClient: baseClient{
+			Args:       args,
+			stop:       make(chan struct{}),
+			stopped:    make(chan struct{}),
+			throttleCh: make(chan struct{}, args.MaxInitConnections),
+			retry:      false,
+		},
+	}
+
+	c.init(c)
+
+	return &c, nil
+}
+
+func (c GrepClient) makeConnection(server string, sshAuthMethods []gossh.AuthMethod, hostKeyCallback *client.HostKeyCallback) *remote.Connection {
+	conn := remote.NewConnection(server, c.UserName, sshAuthMethods, hostKeyCallback)
+	conn.Handler = handlers.NewClientHandler(server, c.PingTimeout)
+
+	for _, file := range strings.Split(c.Files, ",") {
+		conn.Commands = append(conn.Commands, fmt.Sprintf("%s %s regex %s", c.Mode.String(), file, c.Regex))
+	}
+
+	return conn
+}