feat: bash and (fi)zsh completion along with docs

README.md

@@ -38,6 +38,27 @@ make install
 
 The abra binary will be in `$GOPATH/bin`.
 
+## Autocompletion
+
+**bash**
+
+Copy `autocomplete/bash_autocomplete` into `/etc/bash_completion.d/` and rename
+it to abra.
+```
+sudo cp autocomplete/bash_autocomplete /etc/bash_completion.d/abra
+source /etc/bash_completion.d/abra
+```
+
+**(fi)zsh**
+
+(fi)zsh doesn't have an autocompletion folder by default but you can create one, then copy `zsh_autocomplete` into it and add a couple lines to your `~/.zshrc` or `~/.fizsh/.fizshrc`
+```
+sudo mkdir /etc/zsh/completion.d/
+sudo cp autocomplete/zsh_autocomplete /etc/zsh/completion.d/abra
+echo "PROG=abra\n_CLI_ZSH_AUTOCOMPLETE_HACK=1\nsource /etc/zsh/completion.d/abra" >> ~/.zshrc
+```
+(replace .zshrc with ~/.fizsh/.fizshrc if you use fizsh)
+
 ## Hacking
 
 Install direnv, run `cp .envrc.sample .envrc`, then run `direnv allow` in this directory. This will set coopcloud repos as private due to [this bug.](https://git.coopcloud.tech/coop-cloud/coopcloud.tech/issues/20#issuecomment-8201). Or you can run `go env -w GOPRIVATE=coopcloud.tech` but I'm not sure how persistent this is.

autocomplete/bash_autocomplete

@@ -0,0 +1,21 @@
+#! /bin/bash
+
+: ${PROG:=$(basename ${BASH_SOURCE})}
+
+_cli_bash_autocomplete() {
+  if [[ "${COMP_WORDS[0]}" != "source" ]]; then
+    local cur opts base
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    if [[ "$cur" == "-"* ]]; then
+      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} ${cur} --generate-bash-completion )
+    else
+      opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --generate-bash-completion )
+    fi
+    COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
+    return 0
+  fi
+}
+
+complete -o bashdefault -o default -o nospace -F _cli_bash_autocomplete $PROG
+unset PROG

autocomplete/powershell_autocomplete.ps1

@@ -0,0 +1,9 @@
+$fn = $($MyInvocation.MyCommand.Name)
+$name = $fn -replace "(.*)\.ps1$", '$1'
+Register-ArgumentCompleter -Native -CommandName $name -ScriptBlock {
+     param($commandName, $wordToComplete, $cursorPosition)
+     $other = "$wordToComplete --generate-bash-completion"
+         Invoke-Expression $other | ForEach-Object {
+            [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', $_)
+         }
+ }

autocomplete/zsh_autocomplete

@@ -0,0 +1,23 @@
+#compdef $PROG
+
+_cli_zsh_autocomplete() {
+
+  local -a opts
+  local cur
+  cur=${words[-1]}
+  if [[ "$cur" == "-"* ]]; then
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} ${cur} --generate-bash-completion)}")
+  else
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} --generate-bash-completion)}")
+  fi
+
+  if [[ "${opts[1]}" != "" ]]; then
+    _describe 'values' opts
+  else
+    _files
+  fi
+
+  return
+}
+
+compdef _cli_zsh_autocomplete $PROG

cli/cli.go

@@ -67,6 +67,7 @@ func RunApp(version, commit string) {
 			},
 		},
 	}
+	app.EnableBashCompletion = true
 
 	if err := app.Run(os.Args); err != nil {
 		logrus.Fatal(err)