Add --prune option for cargo-tree

src/bin/cargo/commands/tree.rs

@@ -56,6 +56,11 @@ pub fn cli() -> App {
             )
             .short("i"),
         )
+        .arg(multi_opt(
+            "prune",
+            "SPEC",
+            "Prune the given package from the display of the dependency tree",
+        ))
         .arg(opt("depth", "Maximum display depth of the dependency tree").value_name("DEPTH"))
         // Deprecated, use --prefix=none instead.
         .arg(Arg::with_name("no-indent").long("no-indent").hidden(true))
@@ -152,6 +157,8 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     let (edge_kinds, no_proc_macro) = parse_edge_kinds(config, args)?;
     let graph_features = edge_kinds.contains(&EdgeKind::Feature);
 
+    let pkgs_to_prune = args._values_of("prune");
+
     let packages = args.packages_from_flags()?;
     let mut invert = args
         .values_of("invert")
@@ -197,6 +204,7 @@ subtree of the package given to -p.\n\
         target,
         edge_kinds,
         invert,
+        pkgs_to_prune,
         prefix,
         no_dedupe,
         duplicates: args.is_present("duplicates"),

src/cargo/ops/tree/mod.rs

@@ -27,6 +27,8 @@ pub struct TreeOptions {
     /// The dependency kinds to display.
     pub edge_kinds: HashSet<EdgeKind>,
     pub invert: Vec<String>,
+    /// The packages to prune from the display of the dependency tree.
+    pub pkgs_to_prune: Vec<String>,
     /// The style of prefix for each line.
     pub prefix: Prefix,
     /// If `true`, duplicates will be repeated.
@@ -199,7 +201,19 @@ pub fn build_and_print(ws: &Workspace<'_>, opts: &TreeOptions) -> CargoResult<()
         graph.invert();
     }
 
-    print(ws.config(), opts, root_indexes, &graph)?;
+    // Packages to prune.
+    let pkgs_to_prune = opts
+        .pkgs_to_prune
+        .iter()
+        .map(|p| PackageIdSpec::parse(p))
+        .map(|r| {
+            // Provide a error message if pkgid is not within the resolved
+            // dependencies graph.
+            r.and_then(|spec| spec.query(ws_resolve.targeted_resolve.iter()).and(Ok(spec)))
+        })
+        .collect::<CargoResult<Vec<PackageIdSpec>>>()?;
+
+    print(ws.config(), opts, root_indexes, &pkgs_to_prune, &graph)?;
     Ok(())
 }
 
@@ -208,6 +222,7 @@ fn print(
     config: &Config,
     opts: &TreeOptions,
     roots: Vec<usize>,
+    pkgs_to_prune: &[PackageIdSpec],
     graph: &Graph<'_>,
 ) -> CargoResult<()> {
     let format = Pattern::new(&opts.format)
@@ -240,6 +255,7 @@ fn print(
             root_index,
             &format,
             symbols,
+            pkgs_to_prune,
             opts.prefix,
             opts.no_dedupe,
             opts.max_display_depth,
@@ -260,6 +276,7 @@ fn print_node<'a>(
     node_index: usize,
     format: &Pattern,
     symbols: &Symbols,
+    pkgs_to_prune: &[PackageIdSpec],
     prefix: Prefix,
     no_dedupe: bool,
     max_display_depth: u32,
@@ -319,6 +336,7 @@ fn print_node<'a>(
             node_index,
             format,
             symbols,
+            pkgs_to_prune,
             prefix,
             no_dedupe,
             max_display_depth,
@@ -339,6 +357,7 @@ fn print_dependencies<'a>(
     node_index: usize,
     format: &Pattern,
     symbols: &Symbols,
+    pkgs_to_prune: &[PackageIdSpec],
     prefix: Prefix,
     no_dedupe: bool,
     max_display_depth: u32,
@@ -371,6 +390,11 @@ fn print_dependencies<'a>(
         }
     }
 
+    // Current level exceeds maximum display depth. Skip.
+    if levels_continue.len() + 1 > max_display_depth as usize {
+        return;
+    }
+
     let mut it = deps
         .iter()
         .filter(|dep| {
@@ -386,26 +410,34 @@ fn print_dependencies<'a>(
                 true
             }
         })
+        .filter(|dep| {
+            // Filter out packages to prune.
+            match graph.node(**dep) {
+                Node::Package { package_id, .. } => {
+                    !pkgs_to_prune.iter().any(|spec| spec.matches(*package_id))
+                }
+                _ => true,
+            }
+        })
         .peekable();
 
     while let Some(dependency) = it.next() {
-        if levels_continue.len() + 1 <= max_display_depth as usize {
-            levels_continue.push(it.peek().is_some());
-            print_node(
-                config,
-                graph,
-                *dependency,
-                format,
-                symbols,
-                prefix,
-                no_dedupe,
-                max_display_depth,
-                no_proc_macro,
-                visited_deps,
-                levels_continue,
-                print_stack,
-            );
-            levels_continue.pop();
-        }
+        levels_continue.push(it.peek().is_some());
+        print_node(
+            config,
+            graph,
+            *dependency,
+            format,
+            symbols,
+            pkgs_to_prune,
+            prefix,
+            no_dedupe,
+            max_display_depth,
+            no_proc_macro,
+            visited_deps,
+            levels_continue,
+            print_stack,
+        );
+        levels_continue.pop();
     }
 }

src/doc/man/cargo-tree.md

@@ -71,6 +71,10 @@ flag can be used to display the package's reverse dependencies only with the
 subtree of the package given to `-p`.
 {{/option}}
 
+{{#option "`--prune` _spec_" }}
+Prune the given package from the display of the dependency tree.
+{{/option}}
+
 {{#option "`--depth` _depth_" }}
 Maximum display depth of the dependency tree. A depth of 1 displays the direct
 dependencies, for example.

src/doc/man/generated_txt/cargo-tree.txt

@@ -59,6 +59,9 @@ OPTIONS
            package's reverse dependencies only with the subtree of the package
            given to -p.
 
+       --prune spec
+           Prune the given package from the display of the dependency tree.
+
        --depth depth
            Maximum display depth of the dependency tree. A depth of 1 displays
            the direct dependencies, for example.

src/doc/src/commands/cargo-tree.md

@@ -71,6 +71,10 @@ flag can be used to display the package's reverse dependencies only with the
 subtree of the package given to <code>-p</code>.</dd>
 
 
+<dt class="option-term" id="option-cargo-tree---prune"><a class="option-anchor" href="#option-cargo-tree---prune"></a><code>--prune</code> <em>spec</em></dt>
+<dd class="option-desc">Prune the given package from the display of the dependency tree.</dd>
+
+
 <dt class="option-term" id="option-cargo-tree---depth"><a class="option-anchor" href="#option-cargo-tree---depth"></a><code>--depth</code> <em>depth</em></dt>
 <dd class="option-desc">Maximum display depth of the dependency tree. A depth of 1 displays the direct
 dependencies, for example.</dd>

src/etc/man/cargo-tree.1

@@ -69,6 +69,11 @@ flag can be used to display the package's reverse dependencies only with the
 subtree of the package given to \fB\-p\fR\&.
 .RE
 .sp
+\fB\-\-prune\fR \fIspec\fR
+.RS 4
+Prune the given package from the display of the dependency tree.
+.RE
+.sp
 \fB\-\-depth\fR \fIdepth\fR
 .RS 4
 Maximum display depth of the dependency tree. A depth of 1 displays the direct

tests/testsuite/tree.rs

@@ -1720,3 +1720,81 @@ c v1.0.0
         )
         .run();
 }
+
+#[cargo_test]
+fn prune() {
+    let p = make_simple_proj();
+
+    p.cargo("tree --prune c")
+        .with_stdout(
+            "\
+foo v0.1.0 ([..]/foo)
+└── a v1.0.0
+    └── b v1.0.0
+[build-dependencies]
+└── bdep v1.0.0
+    └── b v1.0.0 (*)
+[dev-dependencies]
+└── devdep v1.0.0
+    └── b v1.0.0 (*)
+",
+        )
+        .run();
+
+    // multiple prune
+    p.cargo("tree --prune c --prune bdep")
+        .with_stdout(
+            "\
+foo v0.1.0 ([..]/foo)
+└── a v1.0.0
+    └── b v1.0.0
+[build-dependencies]
+[dev-dependencies]
+└── devdep v1.0.0
+    └── b v1.0.0 (*)
+",
+        )
+        .run();
+
+    // with edge-kinds
+    p.cargo("tree --prune c -e normal")
+        .with_stdout(
+            "\
+foo v0.1.0 ([..]/foo)
+└── a v1.0.0
+    └── b v1.0.0
+",
+        )
+        .run();
+
+    // pruning self does not works
+    p.cargo("tree --prune foo")
+        .with_stdout(
+            "\
+foo v0.1.0 ([..]/foo)
+├── a v1.0.0
+│   └── b v1.0.0
+│       └── c v1.0.0
+└── c v1.0.0
+[build-dependencies]
+└── bdep v1.0.0
+    └── b v1.0.0 (*)
+[dev-dependencies]
+└── devdep v1.0.0
+    └── b v1.0.0 (*)
+",
+        )
+        .run();
+
+    // dep not exist
+    p.cargo("tree --prune no-dep")
+        .with_stderr(
+            "\
+[ERROR] package ID specification `no-dep` did not match any packages
+
+<tab>Did you mean `bdep`?
+",
+        )
+        .with_status(101)
+        .run();
+}