Add shell completion

.gitignore

@@ -2,9 +2,10 @@
 docs/public
 docs/content/signaldctl
 
-# man page files generated for the debian package
+# generated before building debian package
 *.1
 debian/manpages
+debian/signaldctl.bash-completion
 
 # Binaries for programs and plugins
 *.exe

.gitlab-ci.yml

@@ -53,8 +53,8 @@ build:x86:deb:
     - apt-get install -y git-buildpackage dh-golang golang-any golang-github-spf13-cobra-dev golang-github-spf13-viper-dev
     - apt-get install -y ./*.deb && rm -vf *.deb
   script:
-    - echo "generating man pages"
-    - SIGNALDCTL_PUBLIC_DOC_MODE=on go run ./cmd/signaldctl doc -o man
+    - go run ./cmd/signaldctl doc -o man
+    - go run ./cmd/signaldctl completion bash > debian/package.bash-completion
     - ls *.1 > debian/manpages
     - gbp dch --ignore-branch --debian-tag="%(version)s" --git-author --new-version="$(git describe --abbrev=0)+git$(date +%Y-%m-%d)r$(git rev-parse --short=8 HEAD).$(git rev-list $(git describe --abbrev=0)..HEAD --count)"
     - dpkg-buildpackage -us -uc -b
@@ -68,6 +68,8 @@ build:x86:deb:
     job: build
     ref: master
     artifacts: true
+  variables:
+    SIGNALDCTL_PUBLIC_DOC_MODE: on
   artifacts:
     paths:
       - "*.deb"

cmd/signaldctl/cmd/completion.go

@@ -0,0 +1,87 @@
+// Copyright © 2021 Finn Herzfeld <finn@janky.solutions>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"gitlab.com/signald/signald-go/cmd/signaldctl/common"
+)
+
+var completionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion script",
+	Long: `To load completions:
+
+Bash:
+
+$ source <(signaldctl completion bash)
+
+# To load completions for each session, execute once:
+Linux:
+  $ signaldctl completion bash > /etc/bash_completion.d/signaldctl
+MacOS:
+  $ signaldctl completion bash > /usr/local/etc/bash_completion.d/signaldctl
+
+Zsh:
+
+# If shell completion is not already enabled in your environment you will need
+# to enable it.  You can execute the following once:
+
+$ echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+# To load completions for each session, execute once:
+$ signaldctl completion zsh > "${fpath[1]}/_signaldctl"
+
+# You will need to start a new shell for this setup to take effect.
+
+Fish:
+
+$ signaldctl completion fish | source
+
+# To load completions for each session, execute once:
+$ signaldctl completion fish > ~/.config/fish/completions/signaldctl.fish
+
+Powershell:
+
+PS> signaldctl completion powershell | Out-String | Invoke-Expression
+
+# To load completions for every new session, run:
+PS> signaldctl completion powershell > signaldctl.ps1
+# and source this file from your powershell profile.
+`,
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	Args:                  cobra.ExactValidArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		switch args[0] {
+		case "bash":
+			common.Must(cmd.Root().GenBashCompletion(os.Stdout))
+		case "zsh":
+			common.Must(cmd.Root().GenZshCompletion(os.Stdout))
+		case "fish":
+			common.Must(cmd.Root().GenFishCompletion(os.Stdout, true))
+		case "powershell":
+			common.Must(cmd.Root().GenPowerShellCompletion(os.Stdout))
+		}
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(completionCmd)
+}

cmd/signaldctl/cmd/doc.go

@@ -27,7 +27,7 @@ import (
 	"gitlab.com/signald/signald-go/cmd/signaldctl/common"
 )
 
-var DocCmd = &cobra.Command{
+var docCmd = &cobra.Command{
 	Use:         "doc",
 	Aliases:     []string{"docs"},
 	Hidden:      true,
@@ -53,7 +53,7 @@ var DocCmd = &cobra.Command{
 }
 
 func init() {
-	RootCmd.AddCommand(DocCmd)
+	RootCmd.AddCommand(docCmd)
 }
 
 const fmTemplate = `---

debian/rules

@@ -11,7 +11,7 @@ override_dh_auto_install:
 	dh_auto_install -- --no-source
 
 %:
-	dh $@ --buildsystem=golang --with=golang
+	dh $@ --buildsystem=golang --with=golang --with bash-completion
 
 override_dh_auto_build:
 	dh_auto_build -- -ldflags '$(GO_LDFLAGS)'