pre-release filtering

src/main.zig

@@ -67,6 +67,7 @@ pub const Release = struct {
     description: []const u8,
     provider: []const u8,
     is_tag: bool = false,
+    is_prerelease: bool = false, // Track if this is a prerelease/draft
 
     pub fn deinit(self: Release, allocator: Allocator) void {
         allocator.free(self.repo_name);
@@ -205,8 +206,25 @@ pub fn main() !u8 {
     // Sort all releases by published date (most recent first)
     std.mem.sort(Release, all_releases.items, {}, utils.compareReleasesByDate);
 
+    // Filter out prereleases after duplicate detection is complete
+    // Exception: Keep git-style version prereleases (like kraftkit)
+    var filtered_releases = std.ArrayList(Release).init(allocator);
+    defer filtered_releases.deinit();
+
+    for (all_releases.items) |release| {
+        if (!release.is_prerelease) {
+            try filtered_releases.append(release);
+        } else {
+            // Check if this is a git-style version (e.g., v1.2.3-123-g1234567)
+            // These should be included even if marked as prerelease
+            if (isGitStyleVersion(release.tag_name)) {
+                try filtered_releases.append(release);
+            }
+        }
+    }
+
     // Generate Atom feed from filtered releases
-    const atom_content = try atom.generateFeed(allocator, all_releases.items);
+    const atom_content = try atom.generateFeed(allocator, filtered_releases.items);
     defer allocator.free(atom_content);
 
     // Write to output file
@@ -218,12 +236,61 @@ pub fn main() !u8 {
     _ = checkFileSizeAndWarn(atom_content.len);
 
     // Log to stderr for user feedback
-    printInfo("Total releases in feed: {} of {} total in last {} days\n", .{ all_releases.items.len, original_count, @divTrunc(RELEASE_AGE_LIMIT_SECONDS, std.time.s_per_day) });
+    printInfo("Total releases in feed: {} of {} total in last {} days\n", .{ filtered_releases.items.len, original_count, @divTrunc(RELEASE_AGE_LIMIT_SECONDS, std.time.s_per_day) });
     printInfo("Updated feed written to: {s}\n", .{output_file});
 
     return 0;
 }
 
+/// Check if a tag contains git-style version pattern like v1.2.3-123-g1234567
+fn isGitStyleVersion(tag_name: []const u8) bool {
+    // Convert to lowercase for comparison
+    var tag_lower_buf: [256]u8 = undefined;
+    if (tag_name.len >= tag_lower_buf.len) return false;
+
+    const tag_lower = std.ascii.lowerString(tag_lower_buf[0..tag_name.len], tag_name);
+
+    // Look for pattern: -number-g followed by hex characters
+    var i: usize = 0;
+    while (i < tag_lower.len) {
+        if (tag_lower[i] == '-') {
+            // Found a dash, check if followed by digits
+            var j = i + 1;
+            var has_digits = false;
+
+            // Skip digits
+            while (j < tag_lower.len and tag_lower[j] >= '0' and tag_lower[j] <= '9') {
+                has_digits = true;
+                j += 1;
+            }
+
+            // Check if followed by -g and hex characters
+            if (has_digits and j + 2 < tag_lower.len and
+                tag_lower[j] == '-' and tag_lower[j + 1] == 'g')
+            {
+                // Check if followed by hex characters
+                var k = j + 2;
+                var hex_count: usize = 0;
+                while (k < tag_lower.len and
+                    ((tag_lower[k] >= '0' and tag_lower[k] <= '9') or
+                        (tag_lower[k] >= 'a' and tag_lower[k] <= 'f')))
+                {
+                    hex_count += 1;
+                    k += 1;
+                }
+
+                // If we found hex characters, this looks like git describe format
+                if (hex_count >= 4) { // At least 4 hex chars for a reasonable commit hash
+                    return true;
+                }
+            }
+        }
+        i += 1;
+    }
+
+    return false;
+}
+
 fn formatTimestampForDisplay(allocator: Allocator, timestamp: i64) ![]const u8 {
     if (timestamp == 0) {
         return try allocator.dupe(u8, "beginning of time");
@@ -496,6 +563,7 @@ test {
     std.testing.refAllDecls(@import("timestamp_tests.zig"));
     std.testing.refAllDecls(@import("atom.zig"));
     std.testing.refAllDecls(@import("utils.zig"));
+    std.testing.refAllDecls(@import("tag_filter.zig"));
     std.testing.refAllDecls(@import("providers/GitHub.zig"));
     std.testing.refAllDecls(@import("providers/GitLab.zig"));
     std.testing.refAllDecls(@import("providers/SourceHut.zig"));

src/providers/Codeberg.zig

@@ -4,6 +4,7 @@ const json = std.json;
 const Allocator = std.mem.Allocator;
 const ArrayList = std.ArrayList;
 const utils = @import("../utils.zig");
+const tag_filter = @import("../tag_filter.zig");
 
 const Release = @import("../main.zig").Release;
 const Provider = @import("../Provider.zig");
@@ -224,6 +225,13 @@ fn getRepoReleases(allocator: Allocator, client: *http.Client, token: []const u8
         const tag_name_value = obj.get("tag_name") orelse continue;
         if (tag_name_value != .string) continue;
 
+        const tag_name = tag_name_value.string;
+
+        // Skip problematic tags
+        if (tag_filter.shouldSkipTag(allocator, tag_name)) {
+            continue;
+        }
+
         const published_at_value = obj.get("published_at") orelse continue;
         if (published_at_value != .string) continue;
 
@@ -235,7 +243,7 @@ fn getRepoReleases(allocator: Allocator, client: *http.Client, token: []const u8
 
         const release = Release{
             .repo_name = try allocator.dupe(u8, repo),
-            .tag_name = try allocator.dupe(u8, tag_name_value.string),
+            .tag_name = try allocator.dupe(u8, tag_name),
             .published_at = try utils.parseReleaseTimestamp(published_at_value.string),
             .html_url = try allocator.dupe(u8, html_url_value.string),
             .description = try allocator.dupe(u8, body_str),
@@ -342,3 +350,26 @@ test "codeberg release parsing with live data snapshot" {
     );
     try std.testing.expectEqualStrings("codeberg", releases.items[0].provider);
 }
+
+test "Codeberg tag filtering" {
+    const allocator = std.testing.allocator;
+
+    // Test that Codeberg now uses the same filtering as other providers
+    const problematic_tags = [_][]const u8{
+        "nightly", "prerelease", "latest", "edge", "canary", "dev-branch",
+    };
+
+    for (problematic_tags) |tag| {
+        try std.testing.expect(tag_filter.shouldSkipTag(allocator, tag));
+    }
+
+    // Test that valid tags are not filtered
+    const valid_tags = [_][]const u8{
+        "v1.0.0", "v2.1.3-stable",
+        // Note: v1.0.0-alpha.1 is now filtered to avoid duplicates
+    };
+
+    for (valid_tags) |tag| {
+        try std.testing.expect(!tag_filter.shouldSkipTag(allocator, tag));
+    }
+}

src/providers/GitHub.zig

@@ -5,6 +5,7 @@ const Allocator = std.mem.Allocator;
 const ArrayList = std.ArrayList;
 const Thread = std.Thread;
 const utils = @import("../utils.zig");
+const tag_filter = @import("../tag_filter.zig");
 
 const Release = @import("../main.zig").Release;
 const Provider = @import("../Provider.zig");
@@ -488,6 +489,10 @@ fn getRepoReleases(allocator: Allocator, client: *http.Client, token: []const u8
     for (array.items) |item| {
         const obj = item.object;
 
+        // Track prerelease and draft status but don't filter yet
+        const is_prerelease = if (obj.get("prerelease")) |prerelease| prerelease.bool else false;
+        const is_draft = if (obj.get("draft")) |draft| draft.bool else false;
+
         const body_value = obj.get("body") orelse json.Value{ .string = "" };
         const body_str = if (body_value == .string) body_value.string else "";
 
@@ -499,6 +504,7 @@ fn getRepoReleases(allocator: Allocator, client: *http.Client, token: []const u8
             .description = try allocator.dupe(u8, body_str),
             .provider = try allocator.dupe(u8, "github"),
             .is_tag = false,
+            .is_prerelease = is_prerelease or is_draft, // Mark as prerelease if either flag is true
         };
 
         try releases.append(release);
@@ -507,57 +513,9 @@ fn getRepoReleases(allocator: Allocator, client: *http.Client, token: []const u8
     return releases;
 }
 
-fn shouldSkipTag(allocator: std.mem.Allocator, tag_name: []const u8) bool {
+/// Wrapper function for backward compatibility and testing
-    // List of common moving tags that should be filtered out
+pub fn shouldSkipTag(allocator: std.mem.Allocator, tag_name: []const u8) bool {
-    const moving_tags = [_][]const u8{
+    return tag_filter.shouldSkipTag(allocator, tag_name);
-        // common "latest commit tags"
-        "latest",
-        "tip",
-        "continuous",
-        "head",
-
-        // common branch tags
-        "main",
-        "master",
-        "trunk",
-        "develop",
-        "development",
-        "dev",
-
-        // common fast moving channel names
-        "nightly",
-        "edge",
-        "canary",
-        "alpha",
-
-        // common slower channels, but without version information
-        // they probably are not something we're interested in
-        "beta",
-        "rc",
-        "release",
-        "snapshot",
-        "unstable",
-        "experimental",
-        "prerelease",
-        "preview",
-    };
-
-    // Check if tag name contains common moving patterns
-    const tag_lower = std.ascii.allocLowerString(allocator, tag_name) catch return false;
-    defer allocator.free(tag_lower);
-
-    for (moving_tags) |moving_tag|
-        if (std.mem.eql(u8, tag_lower, moving_tag))
-            return true;
-
-    // Skip pre-release and development tags
-    if (std.mem.startsWith(u8, tag_lower, "pre-") or
-        std.mem.startsWith(u8, tag_lower, "dev-") or
-        std.mem.startsWith(u8, tag_lower, "test-") or
-        std.mem.startsWith(u8, tag_lower, "debug-"))
-        return true;
-
-    return false;
 }
 
 fn getRepoTags(allocator: Allocator, client: *http.Client, token: []const u8, repo: []const u8) !ArrayList(Release) {
@@ -660,7 +618,7 @@ fn parseGraphQL(allocator: std.mem.Allocator, repo: []const u8, body: []const u8
         const tag_name = node_obj.get("name").?.string;
 
         // Skip common moving tags
-        if (shouldSkipTag(allocator, tag_name)) continue;
+        if (tag_filter.shouldSkipTag(allocator, tag_name)) continue;
 
         const target = node_obj.get("target").?.object;
 
@@ -1012,6 +970,114 @@ test "addNonReleaseTags should not add duplicate tags" {
     try std.testing.expect(found_unique);
 }
 
+test "GitHub prerelease and draft filtering" {
+    const allocator = std.testing.allocator;
+
+    // Test shouldSkipRelease function
+    try std.testing.expect(tag_filter.shouldSkipRelease(true, false)); // prerelease
+    try std.testing.expect(tag_filter.shouldSkipRelease(false, true)); // draft
+    try std.testing.expect(tag_filter.shouldSkipRelease(true, true)); // both
+    try std.testing.expect(!tag_filter.shouldSkipRelease(false, false)); // normal release
+
+    // Mock GitHub API response with prerelease and draft fields
+    const github_api_response =
+        \\[
+        \\  {
+        \\    "tag_name": "v1.0.0",
+        \\    "published_at": "2024-01-01T00:00:00Z",
+        \\    "html_url": "https://github.com/test/repo/releases/tag/v1.0.0",
+        \\    "body": "Stable release",
+        \\    "prerelease": false,
+        \\    "draft": false
+        \\  },
+        \\  {
+        \\    "tag_name": "v1.1.0-alpha",
+        \\    "published_at": "2024-01-02T00:00:00Z",
+        \\    "html_url": "https://github.com/test/repo/releases/tag/v1.1.0-alpha",
+        \\    "body": "Alpha release",
+        \\    "prerelease": true,
+        \\    "draft": false
+        \\  },
+        \\  {
+        \\    "tag_name": "v1.2.0-draft",
+        \\    "published_at": "2024-01-03T00:00:00Z",
+        \\    "html_url": "https://github.com/test/repo/releases/tag/v1.2.0-draft",
+        \\    "body": "Draft release",
+        \\    "prerelease": false,
+        \\    "draft": true
+        \\  }
+        \\]
+    ;
+
+    // Parse the JSON to verify structure
+    const parsed = try std.json.parseFromSlice(std.json.Value, allocator, github_api_response, .{});
+    defer parsed.deinit();
+
+    const array = parsed.value.array;
+    try std.testing.expectEqual(@as(usize, 3), array.items.len);
+
+    // Verify the prerelease and draft fields are present and correct
+    const stable_release = array.items[0].object;
+    try std.testing.expectEqual(false, stable_release.get("prerelease").?.bool);
+    try std.testing.expectEqual(false, stable_release.get("draft").?.bool);
+
+    const prerelease_item = array.items[1].object;
+    try std.testing.expectEqual(true, prerelease_item.get("prerelease").?.bool);
+    try std.testing.expectEqual(false, prerelease_item.get("draft").?.bool);
+
+    const draft_item = array.items[2].object;
+    try std.testing.expectEqual(false, draft_item.get("prerelease").?.bool);
+    try std.testing.expectEqual(true, draft_item.get("draft").?.bool);
+}
+
+test "shouldSkipTag comprehensive filtering tests" {
+    const allocator = std.testing.allocator;
+
+    // Test exact matches for moving tags
+    const moving_tags = [_][]const u8{
+        "latest",  "tip",         "continuous", "head",     "main",     "master",       "trunk",
+        "develop", "development", "dev",        "nightly",  "edge",     "canary",       "alpha",
+        "beta",    "rc",          "release",    "snapshot", "unstable", "experimental", "prerelease",
+        "preview",
+    };
+
+    for (moving_tags) |tag| {
+        try std.testing.expect(shouldSkipTag(allocator, tag));
+
+        // Test case insensitive matching
+        const upper_tag = try std.ascii.allocUpperString(allocator, tag);
+        defer allocator.free(upper_tag);
+        try std.testing.expect(shouldSkipTag(allocator, upper_tag));
+    }
+
+    // Test prefix patterns
+    const prefix_patterns = [_][]const u8{
+        "pre-release", "pre-1.0.0", "dev-branch",    "dev-feature",
+        "test-build",  "test-123",  "debug-version", "debug-info",
+    };
+
+    for (prefix_patterns) |tag| {
+        try std.testing.expect(shouldSkipTag(allocator, tag));
+    }
+
+    // Test valid version tags that should NOT be filtered
+    const valid_tags = [_][]const u8{
+        "v1.0.0",        "v2.1.3",        "1.0.0",      "2.1.3-stable", "v1.0.0-final",
+        "release-1.0.0", "stable-v1.0.0", "v1.0.0-lts",
+        "2023.1.0",
+        // Note: Semantic versioning prerelease tags are now filtered to avoid duplicates
+    };
+
+    for (valid_tags) |tag| {
+        try std.testing.expect(!shouldSkipTag(allocator, tag));
+    }
+
+    // Test edge cases
+    try std.testing.expect(!shouldSkipTag(allocator, "")); // Empty string
+    try std.testing.expect(!shouldSkipTag(allocator, "v1.0.0+build.1")); // Build metadata
+    try std.testing.expect(!shouldSkipTag(allocator, "nightly-build-v1.0.0")); // Contains "nightly" but has version
+}
+
 test "parse tag graphQL output" {
     const result =
         \\{"data":{"repository":{"refs":{"pageInfo":{"hasNextPage":false,"endCursor":"MzY"},"nodes":[{"name":"v0.7.9","target":{"committedDate":"2025-07-16T06:14:23Z","message":"chore: bump version to v0.7.9"}},{"name":"v0.7.8","target":{"committedDate":"2025-07-15T23:01:11Z","message":"chore: bump version to v0.7.8"}},{"name":"v0.7.7","target":{"committedDate":"2025-04-16T02:32:43Z","message":"chore: bump version to v0.7.0"}},{"name":"v0.7.6","target":{"committedDate":"2025-04-13T18:00:14Z","message":"chore: bump version to v0.7.6"}},{"name":"v0.7.5","target":{"committedDate":"2025-04-12T20:31:13Z","message":"chore: bump version to v0.7.5"}},{"name":"v0.7.4","target":{"committedDate":"2025-04-06T02:08:45Z","message":"chore: bump version to v0.7.4"}},{"name":"v0.3.6","target":{"committedDate":"2024-12-20T07:25:36Z","message":"chore: bump version to v3.4.6"}},{"name":"v0.1.0","target":{"committedDate":"2024-11-16T23:19:14Z","message":"chore: bump version to v0.1.0"}}]}}}}

src/providers/GitLab.zig

@@ -4,6 +4,7 @@ const json = std.json;
 const Allocator = std.mem.Allocator;
 const ArrayList = std.ArrayList;
 const utils = @import("../utils.zig");
+const tag_filter = @import("../tag_filter.zig");
 
 const Release = @import("../main.zig").Release;
 const Provider = @import("../Provider.zig");
@@ -220,9 +221,16 @@ fn getProjectReleases(allocator: Allocator, client: *http.Client, token: []const
         const desc_value = obj.get("description") orelse json.Value{ .string = "" };
         const desc_str = if (desc_value == .string) desc_value.string else "";
 
+        const tag_name = obj.get("tag_name").?.string;
+
+        // Skip problematic tags
+        if (tag_filter.shouldSkipTag(allocator, tag_name)) {
+            continue;
+        }
+
         const release = Release{
             .repo_name = try allocator.dupe(u8, obj.get("name").?.string),
-            .tag_name = try allocator.dupe(u8, obj.get("tag_name").?.string),
+            .tag_name = try allocator.dupe(u8, tag_name),
             .published_at = try utils.parseReleaseTimestamp(obj.get("created_at").?.string),
             .html_url = try allocator.dupe(u8, obj.get("_links").?.object.get("self").?.string),
             .description = try allocator.dupe(u8, desc_str),
@@ -347,3 +355,26 @@ test "gitlab release parsing with live data snapshot" {
     );
     try std.testing.expectEqualStrings("gitlab", releases.items[0].provider);
 }
+
+test "GitLab tag filtering" {
+    const allocator = std.testing.allocator;
+
+    // Test that GitLab now uses the same filtering as other providers
+    const problematic_tags = [_][]const u8{
+        "nightly", "prerelease", "latest", "edge", "canary", "dev-branch",
+    };
+
+    for (problematic_tags) |tag| {
+        try std.testing.expect(tag_filter.shouldSkipTag(allocator, tag));
+    }
+
+    // Test that valid tags are not filtered
+    const valid_tags = [_][]const u8{
+        "v1.0.0", "v2.1.3-stable",
+        // Note: v1.0.0-alpha.1 is now filtered to avoid duplicates
+    };
+
+    for (valid_tags) |tag| {
+        try std.testing.expect(!tag_filter.shouldSkipTag(allocator, tag));
+    }
+}

src/providers/SourceHut.zig

@@ -4,6 +4,7 @@ const json = std.json;
 const Allocator = std.mem.Allocator;
 const ArrayList = std.ArrayList;
 const utils = @import("../utils.zig");
+const tag_filter = @import("../tag_filter.zig");
 
 const Release = @import("../main.zig").Release;
 const Provider = @import("../Provider.zig");
@@ -128,6 +129,11 @@ fn fetchReleasesMultiRepo(allocator: Allocator, client: *http.Client, token: []c
         else
             "1970-01-01T00:00:00Z";
 
+        // Skip problematic tags
+        if (tag_filter.shouldSkipTag(allocator, tag_data.tag_name)) {
+            continue;
+        }
+
         // TODO: Investigate annotated tags as the description here
         const release = Release{
             .repo_name = try std.fmt.allocPrint(allocator, "~{s}/{s}", .{ tag_data.username, tag_data.reponame }),
@@ -600,3 +606,26 @@ test "sourcehut provider" {
 
     try std.testing.expectEqualStrings("sourcehut", sourcehut_provider.getName());
 }
+
+test "SourceHut tag filtering" {
+    const allocator = std.testing.allocator;
+
+    // Test that SourceHut now uses the same filtering as other providers
+    const problematic_tags = [_][]const u8{
+        "nightly", "prerelease", "latest", "edge", "canary", "dev-branch",
+    };
+
+    for (problematic_tags) |tag| {
+        try std.testing.expect(tag_filter.shouldSkipTag(allocator, tag));
+    }
+
+    // Test that valid tags are not filtered
+    const valid_tags = [_][]const u8{
+        "v1.0.0", "v2.1.3-stable",
+        // Note: v1.0.0-alpha.1 is now filtered to avoid duplicates
+    };
+
+    for (valid_tags) |tag| {
+        try std.testing.expect(!tag_filter.shouldSkipTag(allocator, tag));
+    }
+}

src/tag_filter.zig

@@ -0,0 +1,302 @@
+const std = @import("std");
+
+/// Common tag filtering logic that can be used across all providers
+pub fn shouldSkipTag(allocator: std.mem.Allocator, tag_name: []const u8) bool {
+    // Check if tag name contains common moving patterns
+    const tag_lower = std.ascii.allocLowerString(allocator, tag_name) catch return false;
+    defer allocator.free(tag_lower);
+
+    // First check if this looks like semantic versioning (v1.2.3-something or 1.2.3-something)
+    // If it does, we should be more careful about filtering
+    const is_semantic_versioning = isSemVer(tag_lower);
+
+    // List of common moving tags that should be filtered out
+    const moving_tags = [_][]const u8{
+        // common "latest commit tags"
+        "latest",
+        "tip",
+        "continuous",
+        "head",
+
+        // common branch tags
+        "main",
+        "master",
+        "trunk",
+        "develop",
+        "development",
+        "dev",
+
+        // common fast moving channel names
+        "nightly",
+        "edge",
+        "canary",
+
+        // common slower channels, but without version information
+        // they probably are not something we're interested in
+        "release",
+        "snapshot",
+        "unstable",
+        "experimental",
+        "prerelease",
+        "preview",
+    };
+
+    // Check for exact matches with moving tags
+    for (moving_tags) |moving_tag|
+        if (std.mem.eql(u8, tag_lower, moving_tag))
+            return true;
+
+    // Only filter standalone alpha/beta/rc if they're NOT part of semantic versioning
+    if (!is_semantic_versioning) {
+        const standalone_prerelease_tags = [_][]const u8{
+            "alpha",
+            "beta",
+            "rc",
+        };
+
+        for (standalone_prerelease_tags) |tag|
+            if (std.mem.eql(u8, tag_lower, tag))
+                return true;
+    } else {
+        // For semantic versioning, be more conservative and filter out prerelease versions
+        // since these are likely to be duplicates of releases that are already filtered
+        // by the releases API prerelease flag
+        if (containsPrereleaseIdentifier(tag_lower)) {
+            return true;
+        }
+    }
+
+    // Skip pre-release and development tags
+    if (std.mem.startsWith(u8, tag_lower, "pre-") or
+        std.mem.startsWith(u8, tag_lower, "dev-") or
+        std.mem.startsWith(u8, tag_lower, "test-") or
+        std.mem.startsWith(u8, tag_lower, "debug-"))
+        return true;
+
+    return false;
+}
+
+/// Check if a tag looks like semantic versioning
+fn isSemVer(tag_lower: []const u8) bool {
+    // Look for patterns like:
+    // v1.2.3, v1.2.3-alpha.1, 1.2.3, 1.2.3-beta.2, etc.
+
+    var start_idx: usize = 0;
+
+    // Skip optional 'v' prefix
+    if (tag_lower.len > 0 and tag_lower[0] == 'v') {
+        start_idx = 1;
+    }
+
+    if (start_idx >= tag_lower.len) return false;
+
+    // Look for pattern: number.number.number
+    var dot_count: u8 = 0;
+    var has_digit = false;
+
+    for (tag_lower[start_idx..]) |c| {
+        if (c >= '0' and c <= '9') {
+            has_digit = true;
+        } else if (c == '.') {
+            if (!has_digit) return false; // dot without preceding digit
+            dot_count += 1;
+            has_digit = false;
+            if (dot_count > 2) break; // we only care about major.minor.patch
+        } else if (c == '-' or c == '+') {
+            // This could be prerelease or build metadata
+            break;
+        } else {
+            // Invalid character for semver
+            return false;
+        }
+    }
+
+    // Must have at least 2 dots (major.minor.patch) and end with a digit
+    return dot_count >= 2 and has_digit;
+}
+
+/// Check if a semantic version contains prerelease identifiers
+fn containsPrereleaseIdentifier(tag_lower: []const u8) bool {
+    // Look for common prerelease identifiers in semantic versioning
+    const prerelease_identifiers = [_][]const u8{
+        "-alpha",
+        "-beta",
+        "-rc",
+        "-pre",
+    };
+
+    for (prerelease_identifiers) |identifier| {
+        if (std.mem.indexOf(u8, tag_lower, identifier) != null) {
+            return true;
+        }
+    }
+
+    // Note: We don't filter git-style version tags like v1.2.3-123-g1234567
+    // These are development versions but may be useful to track
+    // (e.g., kraftkit releases that should be included per user request)
+
+    return false;
+}
+
+/// Check if a release should be filtered based on prerelease/draft status
+pub fn shouldSkipRelease(is_prerelease: bool, is_draft: bool) bool {
+    return is_prerelease or is_draft;
+}
+
+test "shouldSkipTag filters common moving tags" {
+    const allocator = std.testing.allocator;
+
+    // Test exact matches for moving tags
+    const moving_tags = [_][]const u8{
+        "latest",
+        "tip",
+        "continuous",
+        "head",
+        "main",
+        "master",
+        "trunk",
+        "develop",
+        "development",
+        "dev",
+        "nightly",
+        "edge",
+        "canary",
+        "release",
+        "snapshot",
+        "unstable",
+        "experimental",
+        "prerelease",
+        "preview",
+    };
+
+    for (moving_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(should_skip);
+
+        // Test case insensitive matching
+        const upper_tag = try std.ascii.allocUpperString(allocator, tag);
+        defer allocator.free(upper_tag);
+        const should_skip_upper = shouldSkipTag(allocator, upper_tag);
+        try std.testing.expect(should_skip_upper);
+    }
+
+    // Test standalone alpha/beta/rc (should be filtered)
+    const standalone_prerelease = [_][]const u8{ "alpha", "beta", "rc" };
+    for (standalone_prerelease) |tag| {
+        try std.testing.expect(shouldSkipTag(allocator, tag));
+    }
+}
+
+test "shouldSkipTag filters prefix patterns" {
+    const allocator = std.testing.allocator;
+
+    const prefix_patterns = [_][]const u8{
+        "pre-release",
+        "pre-1.0.0",
+        "dev-branch",
+        "dev-feature",
+        "test-build",
+        "test-123",
+        "debug-version",
+        "debug-info",
+    };
+
+    for (prefix_patterns) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(should_skip);
+    }
+}
+
+test "shouldSkipTag allows valid version tags" {
+    const allocator = std.testing.allocator;
+
+    const valid_tags = [_][]const u8{
+        "v1.0.0",
+        "v2.1.3",
+        "1.0.0",
+        "2.1.3-stable",
+        "v1.0.0-final",
+        "release-1.0.0",
+        "stable-v1.0.0",
+        "v1.0.0-lts",
+        "2023.1.0",
+        // Note: Semantic versioning prerelease tags are now filtered to avoid duplicates
+        // with the releases API, so they're not in this "valid" list anymore
+    };
+
+    for (valid_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(!should_skip);
+    }
+}
+
+test "shouldSkipRelease filters prerelease and draft" {
+    // Test prerelease filtering
+    try std.testing.expect(shouldSkipRelease(true, false));
+
+    // Test draft filtering
+    try std.testing.expect(shouldSkipRelease(false, true));
+
+    // Test both prerelease and draft
+    try std.testing.expect(shouldSkipRelease(true, true));
+
+    // Test normal release
+    try std.testing.expect(!shouldSkipRelease(false, false));
+}
+
+test "semantic versioning detection" {
+    const allocator = std.testing.allocator;
+
+    // Test that semantic versioning tags with alpha/beta/rc are now filtered
+    // (to avoid duplicates with releases API)
+    const semver_prerelease_tags = [_][]const u8{
+        "v1.0.0-alpha.1",
+        "v1.0.0-beta.2",
+        "v1.0.0-rc.1",
+        "1.0.0-alpha.1",
+        "2.0.0-beta.1",
+        "3.0.0-rc.1",
+        "v5.5.0-rc1",
+        "v0.5.0-alpha01",
+        "v1.12.0-beta3",
+        "v1.24.0-rc0",
+    };
+
+    for (semver_prerelease_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(should_skip); // Now these should be filtered
+    }
+
+    // Test that git-style version tags are preserved (per user request for kraftkit)
+    const git_style_tags = [_][]const u8{
+        "v0.11.6-212-g74599361",
+        "v1.2.3-45-g1234567",
+        "v2.0.0-123-gabcdef0",
+    };
+
+    for (git_style_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(!should_skip); // These should NOT be filtered
+    }
+
+    // Test that regular semantic versioning tags are preserved
+    const regular_semver_tags = [_][]const u8{
+        "v1.0.0",
+        "v2.1.3",
+        "1.0.0",
+        "2.1.3",
+        "v10.20.30",
+    };
+
+    for (regular_semver_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(!should_skip);
+    }
+
+    // Test that standalone alpha/beta/rc are still filtered
+    const standalone_tags = [_][]const u8{ "alpha", "beta", "rc", "ALPHA", "Beta", "RC" };
+    for (standalone_tags) |tag| {
+        const should_skip = shouldSkipTag(allocator, tag);
+        try std.testing.expect(should_skip);
+    }
+}