Merge pull request #14 from jetzig-framework/cli-generate

CLI generate command

.github/workflows/CI.yml

@@ -74,7 +74,7 @@ jobs:
         if: ${{ matrix.os == 'ubuntu-latest' }}
         uses: actions/upload-artifact@v2
         with:
-          name: builds-macos-x86
+          name: build-macos-x86
           path: artifacts/x86_64-macos
       - name: Upload artifacts Target MacOS 2
         if: ${{ matrix.os == 'ubuntu-latest' }}

cli/cli.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const args = @import("args");
-const init = @import("init.zig");
+const init = @import("commands/init.zig");
+const generate = @import("commands/generate.zig");
 
 const Options = struct {
     help: bool = false,
@@ -10,8 +11,10 @@ const Options = struct {
     };
 
     pub const meta = .{
+        .usage_summary = "[COMMAND]",
         .option_docs = .{
             .init = "Initialize a new project",
+            .generate = "Generate scaffolding",
             .help = "Print help and exit",
         },
     };
@@ -19,6 +22,8 @@ const Options = struct {
 
 const Verb = union(enum) {
     init: init.Options,
+    generate: generate.Options,
+    g: generate.Options,
 };
 
 /// Main entrypoint for `jetzig` executable. Parses command line args and generates a new
@@ -33,28 +38,45 @@ pub fn main() !void {
 
     const writer = std.io.getStdErr().writer();
 
-    if (options.verb) |verb| {
+    run(allocator, options, writer) catch |err| {
-        switch (verb) {
+        switch (err) {
-            .init => |opts| return init.run(
+            error.JetzigCommandError => std.os.exit(1),
-                allocator,
+            else => return err,
-                opts,
-                writer,
-                options.positionals,
-                .{ .help = options.options.help },
-            ),
         }
-    }
+    };
 
-    if (options.options.help) {
+    if (options.options.help or options.verb == null) {
         try args.printHelp(Options, "jetzig", writer);
         try writer.writeAll(
             \\
             \\Commands:
             \\
             \\  init         Initialize a new project.
+            \\  generate     Generate scaffolding.
             \\
             \\ Pass --help to any command for more information, e.g. `jetzig init --help`
             \\
         );
     }
 }
+
+fn run(allocator: std.mem.Allocator, options: args.ParseArgsResult(Options, Verb), writer: anytype) !void {
+    if (options.verb) |verb| {
+        return switch (verb) {
+            .init => |opts| init.run(
+                allocator,
+                opts,
+                writer,
+                options.positionals,
+                .{ .help = options.options.help },
+            ),
+            .g, .generate => |opts| generate.run(
+                allocator,
+                opts,
+                writer,
+                options.positionals,
+                .{ .help = options.options.help },
+            ),
+        };
+    }
+}

cli/commands/generate.zig

@@ -0,0 +1,81 @@
+const std = @import("std");
+const args = @import("args");
+const view = @import("generate/view.zig");
+const partial = @import("generate/partial.zig");
+const middleware = @import("generate/middleware.zig");
+const util = @import("../util.zig");
+
+/// Command line options for the `generate` command.
+pub const Options = struct {
+    path: ?[]const u8 = null,
+
+    pub const shorthands = .{
+        .p = "path",
+    };
+
+    pub const meta = .{
+        .usage_summary = "[view|middleware] [options]",
+        .full_text =
+        \\Generates scaffolding for views, middleware, and other objects in future.
+        \\
+        \\When generating a view, by default all actions will be included.
+        \\Optionally pass one or more of the following arguments to specify desired actions:
+        \\
+        \\  index, get, post, patch, put, delete
+        \\
+        \\Each view action can be qualified with a `:static` option to mark the view content
+        \\as statically generated at build time.
+        \\
+        \\e.g. generate a view named `iguanas` with a static `index` action:
+        \\
+        \\  jetzig generate view iguanas index:static get post delete
+        ,
+    };
+};
+
+/// Run the `jetzig init` command.
+pub fn run(
+    allocator: std.mem.Allocator,
+    options: Options,
+    writer: anytype,
+    positionals: [][]const u8,
+    other_options: struct { help: bool },
+) !void {
+    var cwd = try util.detectJetzigProjectDir();
+    defer cwd.close();
+
+    _ = options;
+    if (other_options.help) {
+        try args.printHelp(Options, "jetzig generate", writer);
+        return;
+    }
+    var generate_type: ?enum { view, partial, middleware } = null;
+    var sub_args = std.ArrayList([]const u8).init(allocator);
+    defer sub_args.deinit();
+
+    for (positionals) |arg| {
+        if (generate_type == null and std.mem.eql(u8, arg, "view")) {
+            generate_type = .view;
+        } else if (generate_type == null and std.mem.eql(u8, arg, "partial")) {
+            generate_type = .partial;
+        } else if (generate_type == null and std.mem.eql(u8, arg, "middleware")) {
+            generate_type = .middleware;
+        } else if (generate_type == null) {
+            std.debug.print("Unknown generator command: {s}\n", .{arg});
+            return error.JetzigCommandError;
+        } else {
+            try sub_args.append(arg);
+        }
+    }
+
+    if (generate_type) |capture| {
+        return switch (capture) {
+            .view => view.run(allocator, cwd, sub_args.items),
+            .partial => partial.run(allocator, cwd, sub_args.items),
+            .middleware => middleware.run(allocator, cwd, sub_args.items),
+        };
+    } else {
+        std.debug.print("Missing sub-command. Expected: [view|middleware]\n", .{});
+        return error.JetzigCommandError;
+    }
+}

cli/commands/generate/middleware.zig

@@ -0,0 +1,101 @@
+const std = @import("std");
+const util = @import("../../util.zig");
+
+/// Run the middleware generator. Create a middleware file in `src/app/middleware/`
+pub fn run(allocator: std.mem.Allocator, cwd: std.fs.Dir, args: [][]const u8) !void {
+    if (args.len != 1 or !util.isCamelCase(args[0])) {
+        std.debug.print(
+            \\Expected a middleware name in CamelCase.
+            \\
+            \\Example:
+            \\
+            \\  jetzig generate middleware IguanaBrain
+            \\
+        , .{});
+        return error.JetzigCommandError;
+    }
+
+    const dir_path = try std.fs.path.join(allocator, &[_][]const u8{ "src", "app", "middleware" });
+    defer allocator.free(dir_path);
+
+    var dir = try cwd.makeOpenPath(dir_path, .{});
+    defer dir.close();
+
+    const filename = try std.mem.concat(allocator, u8, &[_][]const u8{ args[0], ".zig" });
+    defer allocator.free(filename);
+
+    const file = dir.createFile(filename, .{ .exclusive = true }) catch |err| {
+        switch (err) {
+            error.PathAlreadyExists => {
+                std.debug.print("Middleware already exists: {s}\n", .{filename});
+                return error.JetzigCommandError;
+            },
+            else => return err,
+        }
+    };
+
+    try file.writeAll(middleware_content);
+
+    file.close();
+
+    const realpath = try dir.realpathAlloc(allocator, filename);
+    defer allocator.free(realpath);
+    std.debug.print(
+        \\Generated middleware: {s}
+        \\
+        \\Edit `src/main.zig` and add the new middleware to the `jetzig_options.middleware` declaration:
+        \\
+        \\  pub const jetzig_options = struct {{
+        \\      pub const middleware: []const type = &.{{
+        \\          @import("app/middleware/{s}.zig"),
+        \\      }};
+        \\  }};
+        \\
+        \\Middleware are invoked in the order they appear in `jetzig_options.middleware`.
+        \\
+        \\
+    , .{ realpath, args[0] });
+}
+
+const middleware_content =
+    \\const std = @import("std");
+    \\const jetzig = @import("jetzig");
+    \\
+    \\/// Define any custom data fields you want to store here. Assigning to these fields in the `init`
+    \\/// function allows you to access them in the `beforeRequest` and `afterRequest` functions, where
+    \\/// they can also be modified.
+    \\my_custom_value: []const u8,
+    \\
+    \\const Self = @This();
+    \\
+    \\/// Initialize middleware.
+    \\pub fn init(request: *jetzig.http.Request) !*Self {
+    \\    var middleware = try request.allocator.create(Self);
+    \\    middleware.my_custom_value = "initial value";
+    \\    return middleware;
+    \\}
+    \\
+    \\/// Invoked immediately after the request head has been processed, before relevant view function
+    \\/// is processed. This gives you access to request headers but not the request body.
+    \\pub fn beforeRequest(self: *Self, request: *jetzig.http.Request) !void {
+    \\    request.server.logger.debug("[middleware] my_custom_value: {s}", .{self.my_custom_value});
+    \\    self.my_custom_value = @tagName(request.method);
+    \\}
+    \\
+    \\/// Invoked immediately after the request has finished responding. Provides full access to the
+    \\/// response as well as the request.
+    \\pub fn afterRequest(self: *Self, request: *jetzig.http.Request, response: *jetzig.http.Response) !void {
+    \\    request.server.logger.debug(
+    \\        "[middleware] my_custom_value: {s}, response status: {s}",
+    \\        .{ self.my_custom_value, @tagName(response.status_code) },
+    \\    );
+    \\}
+    \\
+    \\/// Invoked after `afterRequest` is called, use this function to do any clean-up.
+    \\/// Note that `request.allocator` is an arena allocator, so any allocations are automatically
+    \\/// done before the next request starts processing.
+    \\pub fn deinit(self: *Self, request: *jetzig.http.Request) void {
+    \\    request.allocator.destroy(self);
+    \\}
+    \\
+;

cli/commands/generate/partial.zig

@@ -0,0 +1,46 @@
+const std = @import("std");
+
+/// Run the partial generator. Create a partial template in `src/app/views/`
+pub fn run(allocator: std.mem.Allocator, cwd: std.fs.Dir, args: [][]const u8) !void {
+    if (args.len != 2) {
+        std.debug.print(
+            \\Expected a view name and a name for a partial.
+            \\
+            \\Example:
+            \\
+            \\  jetzig generate partial iguanas ziglet
+            \\
+        , .{});
+        return error.JetzigCommandError;
+    }
+
+    const dir_path = try std.fs.path.join(allocator, &[_][]const u8{ "src", "app", "views", args[0] });
+    defer allocator.free(dir_path);
+
+    var dir = try cwd.makeOpenPath(dir_path, .{});
+    defer dir.close();
+
+    const filename = try std.mem.concat(allocator, u8, &[_][]const u8{ "_", args[1], ".zmpl" });
+    defer allocator.free(filename);
+
+    const file = dir.createFile(filename, .{ .exclusive = true }) catch |err| {
+        switch (err) {
+            error.PathAlreadyExists => {
+                std.debug.print("Partial already exists: {s}\n", .{filename});
+                return error.JetzigCommandError;
+            },
+            else => return err,
+        }
+    };
+
+    try file.writeAll(
+        \\<div>Partial content goes here.</div>
+        \\
+    );
+
+    file.close();
+
+    const realpath = try dir.realpathAlloc(allocator, filename);
+    defer allocator.free(realpath);
+    std.debug.print("Generated partial template: {s}\n", .{realpath});
+}

cli/commands/generate/view.zig

@@ -0,0 +1,220 @@
+const std = @import("std");
+const util = @import("../../util.zig");
+
+/// Run the view generator. Create a view in `src/app/views/`
+pub fn run(allocator: std.mem.Allocator, cwd: std.fs.Dir, args: [][]const u8) !void {
+    if (args.len == 0) {
+        std.debug.print(".\n", .{});
+        std.debug.print(
+            \\Expected view name followed by optional actions.
+            \\
+            \\Example:
+            \\
+            \\  jetzig generate view iguanas index:static get post delete
+            \\
+        , .{});
+        return error.JetzigCommandError;
+    }
+
+    var buf = std.ArrayList(u8).init(allocator);
+    defer buf.deinit();
+
+    const writer = buf.writer();
+
+    try writer.writeAll(
+        \\const std = @import("std");
+        \\const jetzig = @import("jetzig");
+        \\
+        \\
+    );
+
+    const filename = try std.mem.concat(allocator, u8, &[_][]const u8{ args[0], ".zig" });
+    defer allocator.free(filename);
+    const action_args = if (args.len > 1)
+        args[1..]
+    else
+        &[_][]const u8{ "index", "get", "post", "put", "patch", "delete" };
+
+    var actions = std.ArrayList(Action).init(allocator);
+    defer actions.deinit();
+
+    var static_actions = std.ArrayList(Action).init(allocator);
+    defer static_actions.deinit();
+
+    for (action_args) |arg| {
+        if (parseAction(arg)) |action| {
+            try actions.append(action);
+            if (action.static) try static_actions.append(action);
+        } else {
+            std.debug.print("Unexpected argument: {s}\n", .{arg});
+            return error.JetzigCommandError;
+        }
+    }
+
+    if (static_actions.items.len > 0) try writeStaticParams(allocator, static_actions.items, writer);
+
+    for (actions.items) |action| {
+        try writeAction(allocator, writer, action);
+        try writeTemplate(allocator, cwd, args[0], action);
+    }
+
+    var dir = try cwd.openDir("src/app/views", .{});
+    defer dir.close();
+
+    const file = dir.createFile(filename, .{ .exclusive = true }) catch |err| {
+        switch (err) {
+            error.PathAlreadyExists => {
+                std.debug.print("Path already exists, skipping view creation: {s}\n", .{filename});
+                return error.JetzigCommandError;
+            },
+            else => return err,
+        }
+    };
+    try file.writeAll(util.strip(buf.items));
+    try file.writeAll("\n");
+    file.close();
+    const realpath = try dir.realpathAlloc(allocator, filename);
+    defer allocator.free(realpath);
+    std.debug.print("Generated view: {s}\n", .{realpath});
+}
+
+const Method = enum { index, get, post, put, patch, delete };
+const Action = struct {
+    method: Method,
+    static: bool,
+};
+
+// Parse a view arg. Grammar:
+// [index[:static]|get[:static]|post[:static]|put[:static]|patch[:static]|delete[:static]]
+fn parseAction(arg: []const u8) ?Action {
+    inline for (@typeInfo(Method).Enum.fields) |tag| {
+        const with_static = tag.name ++ ":static";
+        const method: Method = @enumFromInt(tag.value);
+
+        if (std.mem.eql(u8, tag.name, arg)) return .{ .method = method, .static = false };
+        if (std.mem.eql(u8, with_static, arg)) return .{ .method = method, .static = true };
+    }
+
+    return null;
+}
+
+// Write a view function to the output buffer.
+fn writeAction(allocator: std.mem.Allocator, writer: anytype, action: Action) !void {
+    const function = try std.fmt.allocPrint(
+        allocator,
+        \\pub fn {s}({s}request: *jetzig.{s}, data: *jetzig.Data) !jetzig.View {{
+        \\    _ = data;{s}
+        \\    return request.render({s});
+        \\}}
+        \\
+        \\
+    ,
+        .{
+            @tagName(action.method),
+            switch (action.method) {
+                .index, .post => "",
+                .get, .put, .patch, .delete => "id: []const u8, ",
+            },
+            if (action.static) "StaticRequest" else "Request",
+            switch (action.method) {
+                .index, .post => "",
+                .get, .put, .patch, .delete => "\n    _ = id;",
+            },
+            switch (action.method) {
+                .index, .get => ".ok",
+                .post => ".created",
+                .put, .patch, .delete => ".ok",
+            },
+        },
+    );
+    defer allocator.free(function);
+    try writer.writeAll(function);
+}
+
+// Output static params example. Only invoked if one or more static routes are created.
+fn writeStaticParams(allocator: std.mem.Allocator, actions: []Action, writer: anytype) !void {
+    try writer.writeAll(
+        \\// Define an array of params for each static view function.
+        \\// At build time, static outputs are generated for each set of params.
+        \\// At run time, requests matching the provided params will render the pre-rendered content.
+        \\pub const static_params = .{
+        \\
+    );
+
+    for (actions) |action| {
+        switch (action.method) {
+            .index, .post => {
+                const output = try std.fmt.allocPrint(
+                    allocator,
+                    \\    .{s} = .{{
+                    \\        .{{ .params = .{{ .foo = "bar", .baz = "qux" }} }},
+                    \\    }},
+                    \\
+                ,
+                    .{@tagName(action.method)},
+                );
+                defer allocator.free(output);
+                try writer.writeAll(output);
+            },
+            .get, .put, .patch, .delete => {
+                const output = try std.fmt.allocPrint(
+                    allocator,
+                    \\    .{s} = .{{
+                    \\        .{{ .id = "1", .params = .{{ .foo = "bar", .baz = "qux" }} }},
+                    \\    }},
+                    \\
+                ,
+                    .{@tagName(action.method)},
+                );
+                defer allocator.free(output);
+                try writer.writeAll(output);
+            },
+        }
+    }
+
+    try writer.writeAll(
+        \\};
+        \\
+        \\
+    );
+}
+
+// Generates a Zmpl template for a corresponding view + action.
+fn writeTemplate(allocator: std.mem.Allocator, cwd: std.fs.Dir, name: []const u8, action: Action) !void {
+    const path = try std.fs.path.join(allocator, &[_][]const u8{
+        "src",
+        "app",
+        "views",
+        name,
+    });
+    defer allocator.free(path);
+
+    var view_dir = try cwd.makeOpenPath(path, .{});
+    defer view_dir.close();
+
+    const filename = try std.mem.concat(allocator, u8, &[_][]const u8{ @tagName(action.method), ".zmpl" });
+    defer allocator.free(filename);
+
+    const file = view_dir.createFile(filename, .{ .exclusive = true }) catch |err| {
+        switch (err) {
+            error.PathAlreadyExists => {
+                std.debug.print("Path already exists, skipping template creation: {s}\n", .{filename});
+                return;
+            },
+            else => return err,
+        }
+    };
+
+    try file.writeAll(
+        \\<div>
+        \\  <span>Content goes here</span>
+        \\</div>
+        \\
+    );
+
+    file.close();
+
+    const realpath = try view_dir.realpathAlloc(allocator, filename);
+    defer allocator.free(realpath);
+    std.debug.print("Generated template: {s}\n", .{realpath});
+}

cli/commands/init.zig

@@ -1,18 +1,10 @@
 const std = @import("std");
 const args = @import("args");
+const util = @import("../util.zig");
+
 const init_data = @import("init_data").init_data;
 
-fn base64Decode(allocator: std.mem.Allocator, input: []const u8) ![]const u8 {
+/// Command line options for the `init` command.
-    const decoder = std.base64.Base64Decoder.init(
-        std.base64.url_safe_no_pad.alphabet_chars,
-        std.base64.url_safe_no_pad.pad_char,
-    );
-    const size = try decoder.calcSizeForSlice(input);
-    const ptr = try allocator.alloc(u8, size);
-    try decoder.decode(ptr, input);
-    return ptr;
-}
-
 pub const Options = struct {
     path: ?[]const u8 = null,
 
@@ -50,7 +42,7 @@ pub fn run(
     for (positionals) |arg| {
         if (install_path != null) {
             std.debug.print("Unexpected positional argument: {s}\n", .{arg});
-            return error.JetzigUnexpectedPositionalArgumentsError;
+            return error.JetzigCommandError;
         }
         install_path = arg;
     }
@@ -230,7 +222,7 @@ fn runCommand(allocator: std.mem.Allocator, install_path: []const u8, argv: []co
     std.debug.print("[exec] {s}", .{command});
 
     if (result.term.Exited != 0) {
-        printFailure();
+        util.printFailure();
         std.debug.print(
             \\
             \\Error running command: {s}
@@ -244,9 +236,9 @@ fn runCommand(allocator: std.mem.Allocator, install_path: []const u8, argv: []co
             \\{s}
             \\
         , .{ command, result.stdout, result.stderr });
-        return error.JetzigRunCommandError;
+        return error.JetzigCommandError;
     } else {
-        printSuccess();
+        util.printSuccess();
     }
 }
 
@@ -267,7 +259,7 @@ fn copySourceFile(
     var content: []const u8 = undefined;
     if (replace) |capture| {
         const initial = readSourceFile(allocator, src) catch |err| {
-            printFailure();
+            util.printFailure();
             return err;
         };
         defer allocator.free(initial);
@@ -276,25 +268,25 @@ fn copySourceFile(
         }
     } else {
         content = readSourceFile(allocator, src) catch |err| {
-            printFailure();
+            util.printFailure();
             return err;
         };
     }
     defer allocator.free(content);
 
     writeSourceFile(install_dir, dest, content) catch |err| {
-        printFailure();
+        util.printFailure();
         return err;
     };
-    printSuccess();
+    util.printSuccess();
 }
 
 // Read a file from Jetzig source code.
 fn readSourceFile(allocator: std.mem.Allocator, path: []const u8) ![]const u8 {
     inline for (init_data) |file| {
-        if (std.mem.eql(u8, path, file.path)) return try base64Decode(allocator, file.data);
+        if (std.mem.eql(u8, path, file.path)) return try util.base64Decode(allocator, file.data);
     }
-    return error.SourceFileNotFound;
+    return error.JetzigCommandError;
 }
 
 // Write a file to the new project's directory.
@@ -335,7 +327,7 @@ fn githubUrl(allocator: std.mem.Allocator) ![]const u8 {
 
     if (fetch_result.status != .ok) {
         std.debug.print("Error fetching from GitHub: {s}\n", .{url});
-        return error.JetzigGitHubFetchError;
+        return error.JetzigCommandError;
     }
 
     const parsed_response = try std.json.parseFromSlice(
@@ -381,20 +373,15 @@ fn promptInput(
         const input = try reader.readUntilDelimiterOrEofAlloc(allocator, '\n', max_read_bytes);
         if (input) |capture| {
             defer allocator.free(capture);
-            const stripped_input = strip(capture);
+            const stripped_input = util.strip(capture);
 
             if (std.mem.eql(u8, stripped_input, "")) {
-                if (options.default) |default| return try allocator.dupe(u8, strip(default));
+                if (options.default) |default| return try allocator.dupe(u8, util.strip(default));
             } else return try allocator.dupe(u8, stripped_input);
         }
     }
 }
 
-// Strip leading and trailing whitespace from a u8 slice.
-fn strip(input: []const u8) []const u8 {
-    return std.mem.trim(u8, input, &std.ascii.whitespace);
-}
-
 // Initialize a new Git repository when setting up a new project (optional).
 fn gitSetup(allocator: std.mem.Allocator, install_dir: *std.fs.Dir) !void {
     try runCommand(allocator, install_dir, &[_][]const u8{
@@ -416,13 +403,3 @@ fn gitSetup(allocator: std.mem.Allocator, install_dir: *std.fs.Dir) !void {
         "Initialize Jetzig project",
     });
 }
-
-/// Print a success confirmation.
-fn printSuccess() void {
-    std.debug.print(" ✅\n", .{});
-}
-
-/// Print a failure confirmation.
-fn printFailure() void {
-    std.debug.print(" ❌\n", .{});
-}

cli/util.zig

@@ -0,0 +1,96 @@
+const std = @import("std");
+
+/// Decode a base64 string, used for parsing out build artifacts generated by the CLI program's
+/// build.zig which are stored in the executable as a module.
+pub fn base64Decode(allocator: std.mem.Allocator, input: []const u8) ![]const u8 {
+    const decoder = std.base64.Base64Decoder.init(
+        std.base64.url_safe_no_pad.alphabet_chars,
+        std.base64.url_safe_no_pad.pad_char,
+    );
+    const size = try decoder.calcSizeForSlice(input);
+    const ptr = try allocator.alloc(u8, size);
+    try decoder.decode(ptr, input);
+    return ptr;
+}
+
+/// Print a success confirmation.
+pub fn printSuccess() void {
+    std.debug.print(" ✅\n", .{});
+}
+
+/// Print a failure confirmation.
+pub fn printFailure() void {
+    std.debug.print(" ❌\n", .{});
+}
+
+/// Verifies that cwd is the root of a Jetzig project
+pub fn detectJetzigProjectDir() !std.fs.Dir {
+    var dir = try std.fs.cwd().openDir(".", .{});
+    const max_parent_dirs: usize = 100; // Prevent symlink loops or other weird stuff.
+
+    for (0..max_parent_dirs) |_| {
+        if (try isPath(dir, "build.zig", .file) and try isPath(dir, "src/app/views", .dir)) return dir;
+
+        dir = dir.openDir("..", .{}) catch |err| {
+            switch (err) {
+                error.FileNotFound, error.NotDir => {
+                    std.debug.print(
+                        "Encountered unexpected detecting Jetzig project directory: {s}\n",
+                        .{@errorName(err)},
+                    );
+                    return error.JetzigCommandError;
+                },
+                else => return err,
+            }
+        };
+        continue;
+    }
+
+    std.debug.print(
+        \\Exceeded maximum parent directory depth.
+        \\Unable to detect Jetzig project directory.
+        \\
+    ,
+        .{},
+    );
+    return error.JetzigCommandError;
+}
+
+fn isPath(dir: std.fs.Dir, sub_path: []const u8, path_type: enum { file, dir }) !bool {
+    switch (path_type) {
+        .file => {
+            _ = dir.statFile(sub_path) catch |err| {
+                switch (err) {
+                    error.FileNotFound => return false,
+                    else => return err,
+                }
+            };
+            return true;
+        },
+        .dir => {
+            var test_dir = dir.openDir(sub_path, .{}) catch |err| {
+                switch (err) {
+                    error.FileNotFound, error.NotDir => return false,
+                    else => return err,
+                }
+            };
+            test_dir.close();
+            return true;
+        },
+    }
+}
+
+// Strip leading and trailing whitespace from a u8 slice.
+pub fn strip(input: []const u8) []const u8 {
+    return std.mem.trim(u8, input, &std.ascii.whitespace);
+}
+
+/// Attempts to confirm if a string input is in CamelCase. False if the first character is
+/// not alphabetic lower-case or if the input contains underscores.
+pub fn isCamelCase(input: []const u8) bool {
+    if (input.len == 0) return false;
+    if (!std.mem.containsAtLeast(u8, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1, &[_]u8{input[0]})) return false;
+    if (std.mem.containsAtLeast(u8, input, 1, "_")) return false;
+
+    return true;
+}

demo/src/app/lib/example.zig

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+pub fn exampleFunction() []const u8 {
+    return "example value";
+}

src/cli.gitignore

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+zig-out/
+zig-cache/