Suppress recipe not found error code

src/config.rs

@@ -103,6 +103,7 @@ mod arg {
   pub(crate) const NO_HIGHLIGHT: &str = "NO-HIGHLIGHT";
   pub(crate) const ONE: &str = "ONE";
   pub(crate) const QUIET: &str = "QUIET";
+  pub(crate) const IF_PRESENT: &str = "IF-PRESENT";
   pub(crate) const SET: &str = "SET";
   pub(crate) const SHELL: &str = "SHELL";
   pub(crate) const SHELL_ARG: &str = "SHELL-ARG";
@@ -315,6 +316,13 @@ impl Config {
           .help("Suppress all output")
           .conflicts_with(arg::DRY_RUN),
       )
+      .arg(
+        Arg::new(arg::IF_PRESENT)
+          .long("if-present")
+          .env("JUST_IF_PRESENT")
+          .action(ArgAction::SetTrue)
+          .help("Suppress error code"),
+      )
       .arg(
         Arg::new(arg::SET)
           .long("set")
@@ -751,6 +759,8 @@ impl Config {
       unstable,
       verbosity: if matches.get_flag(arg::QUIET) {
         Verbosity::Quiet
+      } else if matches.get_flag(arg::IF_PRESENT) {
+        Verbosity::RecipeQuiet
       } else {
         Verbosity::from_flag_occurrences(matches.get_count(arg::VERBOSE))
       },

src/run.rs

@@ -28,6 +28,13 @@ pub fn run(args: impl Iterator<Item = impl Into<OsString> + Clone>) -> Result<()
       config.subcommand.execute(&config, &loader)
     })
     .map_err(|error| {
+      if verbosity.recipe_quiet() {
+        match error {
+          Error::UnknownRecipe { .. } => return 0,
+          _ => {}
+        };
+      }
+
       if !verbosity.quiet() && error.print_message() {
         eprintln!("{}", error.color_display(color.stderr()));
       }

src/verbosity.rs

@@ -1,6 +1,7 @@
 #[derive(Copy, Clone, Debug, PartialEq, PartialOrd)]
 pub(crate) enum Verbosity {
   Quiet,
+  RecipeQuiet,
   Taciturn,
   Loquacious,
   Grandiloquent,
@@ -19,6 +20,10 @@ impl Verbosity {
     self == Self::Quiet
   }
 
+  pub(crate) fn recipe_quiet(self) -> bool {
+    self == Self::RecipeQuiet
+  }
+
   pub(crate) fn loud(self) -> bool {
     !self.quiet()
   }

tests/if_present.rs

@@ -0,0 +1,33 @@
+use super::*;
+
+#[test]
+fn without_if_present() {
+  Test::new()
+    .arg("execute")
+    .justfile(
+      "
+        build:
+          echo \"Building...\"
+      ",
+    )
+    .stderr("error: Justfile does not contain recipe `execute`.\n")
+    .stdout("")
+    .status(1)
+    .run();
+}
+
+#[test]
+fn ignore_unknown_recipe() {
+  Test::new()
+    .args(["--if-present", "execute"])
+    .justfile(
+      "
+        build:
+          echo \"Building...\"
+      ",
+    )
+    .stderr("")
+    .stdout("")
+    .status(0)
+    .run();
+}

tests/lib.rs

@@ -64,6 +64,7 @@ mod functions;
 #[cfg(unix)]
 mod global;
 mod groups;
+mod if_present;
 mod ignore_comments;
 mod imports;
 mod init;