Tweak things in installation instructions and completion

modules/cli-core/src/main/scala/scala/cli/ScalaCliBase.scala

@@ -11,7 +11,7 @@ abstract class ScalaCliBase extends CommandsEntryPoint {
 
   def actualDefaultCommand: DefaultBase
 
-  lazy val progName = (new Argv0).get("scala")
+  lazy val progName = (new Argv0).get("scala-cli")
   override def description = "Compile, run, package Scala code."
   final override def defaultCommand = Some(actualDefaultCommand)
 

modules/cli-core/src/main/scala/scala/cli/commands/InstallCompletions.scala

@@ -7,7 +7,7 @@ import java.util.Arrays
 import caseapp._
 import caseapp.core.complete.{Bash, Zsh}
 
-import scala.cli.internal.ProfileFileUpdater
+import scala.cli.internal.{Argv0, ProfileFileUpdater}
 
 object InstallCompletions extends ScalaCommand[InstallCompletionsOptions] {
   override def names = List(
@@ -23,6 +23,13 @@ object InstallCompletions extends ScalaCommand[InstallCompletionsOptions] {
 
     val logger = options.logging.logger
 
+    val name = options.name.getOrElse {
+      val baseName = (new Argv0).get("scala-cli")
+      val idx = baseName.lastIndexOf(File.pathSeparator)
+      if (idx < 0) baseName
+      else baseName.drop(idx + 1)
+    }
+
     val format = options.format.map(_.trim).filter(_.nonEmpty)
       .orElse {
         Option(System.getenv("SHELL")).map(_.split(File.separator).last).map {
@@ -31,21 +38,26 @@ object InstallCompletions extends ScalaCommand[InstallCompletionsOptions] {
           case other => other
         }
       }
-      .getOrElse(sys.error("Cannot determine current shell, pass the shell you use with --format"))
+      .getOrElse {
+        System.err.println("Cannot determine current shell, pass the shell you use with --shell, like")
+        System.err.println(s"  $name install completions --shell zsh")
+        System.err.println(s"  $name install completions --shell bash")
+        sys.exit(1)
+      }
 
     val (rcScript, defaultRcFile) = format match {
       case Bash.id | "bash" =>
-        val script = Bash.script(options.name)
+        val script = Bash.script(name)
         val defaultRcFile = home / ".bashrc"
         (script, defaultRcFile)
       case Zsh.id | "zsh" =>
-        val completionScript = Zsh.script(options.name)
+        val completionScript = Zsh.script(name)
         val zDotDir = Option(System.getenv("ZDOTDIR"))
           .map(os.Path(_, os.pwd))
           .getOrElse(home)
         val defaultRcFile = zDotDir / ".zshrc"
         val dir = completionsDir / "zsh"
-        val completionScriptDest = dir / "_scala"
+        val completionScriptDest = dir / s"_$name"
         val content = completionScript.getBytes(Charset.defaultCharset())
         if (!os.exists(completionScriptDest) || !Arrays.equals(os.read.bytes(completionScriptDest), content)) {
           logger.log(s"Writing $completionScriptDest")
@@ -65,7 +77,7 @@ object InstallCompletions extends ScalaCommand[InstallCompletionsOptions] {
       .map(os.Path(_, os.pwd))
       .getOrElse(defaultRcFile)
 
-    val banner = options.banner.replace("{NAME}", options.name)
+    val banner = options.banner.replace("{NAME}", name)
 
     val updated = ProfileFileUpdater.addToProfileFile(rcFile.toNIO, banner, rcScript, Charset.defaultCharset())
 

modules/cli-core/src/main/scala/scala/cli/commands/InstallCompletionsOptions.scala

@@ -8,10 +8,11 @@ final case class InstallCompletionsOptions(
   @Recurse
     directories: SharedDirectoriesOptions = SharedDirectoriesOptions(),
 
-  format: Option[String] = None,
+  @Name("shell")
+    format: Option[String] = None,
 
   rcFile: Option[String] = None,
   directory: Option[String] = None,
-  banner: String = "{NAME} CLI completions",
-  name: String = "scala"
+  banner: String = "{NAME} completions",
+  name: Option[String] = None
 )

project/settings.sc

@@ -71,7 +71,7 @@ trait CliLaunchers extends SbtModule { self =>
     def nativeImageOptions = Seq(
       s"-H:IncludeResources=$localRepoResourcePath"
     )
-    def nativeImageName = "scala"
+    def nativeImageName = "scala-cli"
     def nativeImageClassPath = self.nativeImageClassPath()
     def nativeImageMainClass = self.nativeImageMainClass()
   }

website/docs/installation.md

@@ -29,7 +29,7 @@ Download the launcher from GitHub release assets with
 ```text
 $ curl -fL https://github.com/VirtuslabRnD/scala-cli/releases/download/nightly/scala-cli-x86_64-apple-darwin.gz | gzip -d > scala-cli
 $ chmod +x scala-cli
-$ sudo mv scala-cli /usr/local/bin/scala-cli
+$ mv scala-cli /usr/local/bin/scala-cli
 ```
 
 Check that it runs fine by running its `about` command:
@@ -39,6 +39,9 @@ $ scala-cli about
 
 ### Windows
 
+Note that the Windows manual installation requires [Visual C++ redistributable](https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0)
+to be installed. See below for how to install it.
+
 Download the launcher from GitHub release assets with
 ```text
 > curl -fLo scala-cli.zip https://github.com/VirtuslabRnD/scala-cli/releases/download/nightly/scala-cli-x86_64-pc-win32.zip
@@ -50,7 +53,16 @@ Check that it runs fine by running its `about` command:
 > scala-cli about
 ```
 
-Note that this doesn't put the `scala-cli` command in the `PATH`. For that, you can create a directory, move the
+If you get an error about `MSVCR100.dll` being missing, you have to install
+[Visual C++ redistributable](https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0). A valid version is distributed with the Scala CLI launchers.
+You can download it [here](https://github.com/VirtuslabRnD/scala-cli/releases/download/nightly/vc_redist.x64.exe),
+and install it by double-clicking on it. Once the Visual C++ redistributable runtime is installed,
+check that the Scala CLI runs fine by running its `about` command:
+```text
+> scala-cli about
+```
+
+Note that the commands above don't put the `scala-cli` command in the `PATH`. For that, you can create a directory, move the
 launcher there, and add the directory to the `PATH` with
 ```text
 > md "%USERPROFILE%/scala-cli"

website/docs/reference/cli-options.md

@@ -163,6 +163,8 @@ Available in commands:
 
 #### `--format`
 
+Aliases: `--shell`
+
 #### `--rc-file`
 
 #### `--directory`