docs(docs): update README, CHANGELOG, ROADMAP, Taskfile for v0.3.0

Document glint render, --no-warn, exit codes 2/10, --no-skipped, and
colorized output. Fix Taskfile validate entries: fixtures that now exit
10 (warnings only) require ignore_error: true to pass the validate task.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 This project uses [Semantic Versioning](https://semver.org).
 
+## [0.3.0] - 2026-06-26
+
+### Added
+
+- **`glint render` subcommand** — resolves all `include:` and `extends:` chains and writes the fully flattened pipeline to a single YAML file (default: `rendered.gitlab-ci.yml`; use `--output -` for stdout). Strips the consumed `include:` and `extends:` keys; retains template jobs (`.name`). Accepts the same network flags as `glint check` (`--token`, `--gitlab-url`, `--cache-dir`, `--offline`, `--proxy`). Useful for inspecting what GitLab CI actually sees or running further local tooling.
+
+- **`glint check --no-warn`** — discard all warning findings before output and exit-code calculation. Mixed pipelines (errors + warnings) still exit 2 but only errors are printed. Warnings-only pipelines report "OK" and exit 0.
+
+- **`glint graph --no-skipped`** — remove jobs that evaluate to `skipped` in the given context (or the implicit `branch=main` default) from all graph output: tree, SVG, HTML, and Mermaid.
+
+- **Colorized, columnized text output** — `glint check` (text format) now renders findings in four aligned columns: location, rule ID, severity, message. `error` is printed in bold red; `warning` in bold orange. Colors are auto-detected (stdout must be a terminal) and suppressed when `NO_COLOR` is set. Location uses `file:line:col` format when column information is available.
+
+- **`line:col` locations** — `Column int` added to `model.Job` (set from the YAML parser's `yaml.Node.Column`) and propagated to `Finding.Column` across all linter rules. Plain-text and `Finding.String()` now emit `file:line:col` when column is known.
+
+### Changed
+
+- **Exit codes** *(breaking)* — `glint check` now exits `2` when one or more error findings are present (previously `1`) and `10` when findings contain only warnings. Exit `0` remains for a clean pipeline. Errors take precedence over warnings. Scripts that test `[ $? -eq 1 ]` need to be updated to `[ $? -eq 2 ]`.
+
 ## [0.2.31] - 2026-06-26
 
 ### Added

README.md

@@ -6,7 +6,7 @@
 
 <p align="center">
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache%202.0-blue.svg" alt="License"></a>
-  <a href="CHANGELOG.md"><img src="https://img.shields.io/badge/release-v0.2.31-blue.svg" alt="Release"></a>
+  <a href="CHANGELOG.md"><img src="https://img.shields.io/badge/release-v0.3.0-blue.svg" alt="Release"></a>
 </p>
 
 > **Disclaimer:** This tool was built through iterative AI-assisted development with [Claude](https://claude.ai). It is experimental, incomplete, and not intended for production use. Coverage of GitLab CI keywords is best-effort and may lag behind GitLab's evolving spec. Use it at your own discretion — no correctness guarantees are made. Contributions and bug reports are welcome.
@@ -17,10 +17,11 @@ A local tool to validate and lint `.gitlab-ci.yml` pipelines without needing a G
 
 - **Lints** — 45 rules covering pipeline structure, keyword constraints, `needs:`/`dependencies:` graphs, expression reachability, and deprecations (GL001–GL045); run `glint explain <ID>` for any rule
 - **Resolves includes** — local files, HTTPS URLs, GitLab project templates, and CI/CD Catalog components, with offline cache support and HTTP proxy support (`--proxy` flag or `proxy:` in `.glint.yml`)
+- **Renders merged pipeline** — `glint render` resolves all includes and `extends:` chains into a single flat YAML file, matching what GitLab CI actually processes
 - **Simulates context** — `--branch`, `--tag`, `--source` flags evaluate `rules:if:` and `only`/`except` to show which jobs would be active, manual, or skipped; `--context branch=main --context branch=develop` prints a multi-column comparison table across multiple contexts in one run
-- **Multiple output formats** — `--format text` (default, ruff-style), `json`, `sarif` (GitHub Code Scanning / GitLab SAST), `junit`, `github` (PR annotations)
+- **Multiple output formats** — `--format text` (default, colorized and column-aligned), `json`, `sarif` (GitHub Code Scanning / GitLab SAST), `junit`, `github` (PR annotations); exits `2` on errors, `10` on warnings only
-- **Project config** — `.glint.yml` for rule suppression, severity overrides, token/URL/proxy defaults; `# glint: ignore RULE` for per-job inline suppression
+- **Project config** — `.glint.yml` for rule suppression, severity overrides, token/URL/proxy defaults; `# glint: ignore RULE` for per-job inline suppression; `--no-warn` flag to suppress all warnings
-- **Graph visualization** — `glint graph` prints a terminal job tree; `glint graph pipeline` renders a GitLab CI-style SVG/PNG; `--format mermaid` emits a Mermaid flowchart; `--format html` produces a self-contained HTML file with pan/zoom and a job-detail sidebar; context flags grey out skipped jobs
+- **Graph visualization** — `glint graph` prints a terminal job tree; `glint graph pipeline` renders a GitLab CI-style SVG/PNG; `--format mermaid` emits a Mermaid flowchart; `--format html` produces a self-contained HTML file with pan/zoom and a job-detail sidebar; `--no-skipped` hides jobs that would not run in the given context
 - **LSP server** — `glint lsp` starts a Language Server Protocol server over stdin/stdout; connect with any LSP client to get inline diagnostics (rule ID as code, error/warning severity) in VS Code, Neovim, Emacs, JetBrains, etc.
 - **VS Code extension** — `editors/vscode/` wraps the LSP server; inline squiggles for every glint rule directly in the editor
 

ROADMAP.md

@@ -53,6 +53,7 @@ The current rule set covers the most common sources of broken pipelines. These a
 - [x] **Recursive include depth limit** — shipped v0.2.17; depth capped at 100 (matching GitLab); project/component includes now tracked in visited set to prevent cross-file cycles
 - [x] **Offline mode / cache** — shipped v0.2.17; `--cache-dir DIR` persists fetched templates; `--offline` serves from cache only; default cache dir (`~/.cache/glint`) used automatically with `--offline`
 - [x] **`include: inputs:`** — shipped v0.2.17; `$[[ inputs.KEY ]]` and `$[[ inputs.KEY | default(…) ]]` placeholders in fetched component YAML are substituted from the include's `with:` block before parsing
+- [x] **`glint render` subcommand** — shipped v0.3.0; resolves all `include:` and `extends:` chains into a single flat YAML file; strips consumed keys; accepts same network flags as `glint check`; default output `rendered.gitlab-ci.yml`, use `--output -` for stdout
 
 ---
 
@@ -79,6 +80,7 @@ The SVG renderer and terminal tree cover the basic layout. These would bring it
 - [x] **Mermaid pipeline output** — shipped v0.2.25; `glint graph pipeline --format mermaid` prints a Mermaid flowchart to stdout (paste into mermaid.live)
 - [x] **Same-stage job ordering** — shipped v0.2.26; jobs within a stage that have `needs:` between each other are placed in topological sub-columns (left-to-right by depth); stage header spans all sub-columns
 - [x] **Graph links rendered behind job chips** — shipped v0.2.26; SVG connectors (Bézier curves and bus-bar stubs) are drawn before job chips so lines pass behind rectangles
+- [x] **`glint graph --no-skipped`** — shipped v0.3.0; removes jobs evaluated as `skipped` in the given context from tree, SVG, HTML, and Mermaid output
 
 ---
 
@@ -86,6 +88,8 @@ The SVG renderer and terminal tree cover the basic layout. These would bring it
 
 - [x] **File and line numbers on findings** — shipped post-v0.2.0; every finding includes the source file and exact line of the job key; works across local includes, remote project templates, and fetched component templates
 - [x] **Ruff-style output format** — shipped v0.2.11; findings follow `file:line: RULEID [severity] message` matching the convention used by ruff and other modern linters
+- [x] **Colorized, columnized text output** — shipped v0.3.0; four aligned columns (location, rule, severity, message); `error` in bold red, `warning` in bold orange; auto-detected terminal color (respects `NO_COLOR`)
+- [x] **`line:col` locations** — shipped v0.3.0; `Column int` on `model.Job` and `Finding`; text output and `Finding.String()` emit `file:line:col` when column is known
 - [x] **`needs: optional: true` false-positive errors** — shipped post-v0.2.0; optional missing needs are downgraded to `[WARNING]`
 - [x] **`extends:` jobs with missing script false errors** — shipped post-v0.2.0; jobs using `extends:` that have no `script` after resolution emit `[WARNING]` (the script may come from an unfetchable remote base)
 - [x] **`rules:if:` static reachability (GL042)** — shipped v0.2.20; warns when all `rules:if:` conditions evaluate to false given declared variable values (only fires when all referenced vars are declared in YAML)
@@ -129,3 +133,5 @@ The SVG renderer and terminal tree cover the basic layout. These would bring it
 - [x] **Subcommand CLI** — shipped v0.2.0 (2026-06-11); `glint check` / `glint graph [mode]` with ruff-style `--help`
 - [x] **Changelog automation** — shipped v0.2.27; `cliff.toml` configures git-cliff to produce Keep-a-Changelog–compatible release notes from Conventional Commits; `task changelog` regenerates `CHANGELOG.md`, `task changelog-next` previews unreleased entries
 - [x] **Fuzz testing** — shipped v0.2.27; `FuzzParseBytes` and `FuzzSanitizeYAMLEscapes` in `internal/model/fuzz_test.go`; seeds run as regular tests in CI; `task fuzz` runs them continuously (default 30 s)
+- [x] **`glint check --no-warn`** — shipped v0.3.0; discards all warning findings before output and exit-code calculation; mixed pipelines (errors + warnings) still exit 2 but only errors are printed; warnings-only pipelines exit 0
+- [x] **Exit codes 2 / 10** *(breaking)* — shipped v0.3.0; `glint check` exits `2` when errors are present (previously `1`) and `10` when findings contain only warnings; exit `0` for clean

Taskfile.yml

@@ -68,31 +68,31 @@ tasks:
       - cmd: ./{{.BINARY}} check --branch feat/x testdata/rules_if_expr.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/workflow_vars.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check --branch main testdata/workflow_vars.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check --branch develop testdata/workflow_vars.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check --branch feat/x testdata/workflow_vars.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/workflow_escape.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/variable_refs.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/variable_refs_included.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/dead_rules.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/new_rules_valid.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/new_rules_invalid.yml
         ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/samba/.gitlab-ci.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/samba/.gitlab-ci-coverage.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/samba/.gitlab-ci-private.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check --format json testdata/valid.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check --format sarif testdata/valid.yml
@@ -104,15 +104,15 @@ tasks:
       - cmd: ./{{.BINARY}} check testdata/config_ignored/.gitlab-ci.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/config_severity/.gitlab-ci.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/config_suppress/.gitlab-ci.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/static_dead_rules.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/inherit_dead.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/inherit_dead_fields.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} check testdata/rules_needs_valid.yml
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/rules_needs_invalid.yml
@@ -124,7 +124,7 @@ tasks:
       - cmd: ./{{.BINARY}} explain GL044
         ignore_error: false
       - cmd: ./{{.BINARY}} check testdata/insecure_remote_include.yml
-        ignore_error: false
+        ignore_error: true
       - cmd: ./{{.BINARY}} explain
         ignore_error: false
 

cmd/glint/main.go

@@ -66,7 +66,8 @@ const globalUsage = `glint: Lint and visualise GitLab CI pipelines locally.
 Usage: glint [OPTIONS] <COMMAND>
 
 Commands:
-  check    Lint a pipeline file — exits 0 (clean) or 1 (errors found)
+  check    Lint a pipeline file — exits 0 (clean), 2 (errors), or 10 (warnings only)
+  render   Resolve all includes and extends into a single merged YAML file
   graph    Visualise the pipeline as a job tree or Mermaid graph
   explain  Show description and fix for a lint rule (e.g. glint explain GL007)
   lsp      Start a Language Server Protocol server (stdin/stdout)
@@ -87,6 +88,8 @@ func main() {
 	switch os.Args[1] {
 	case "check":
 		cmdCheck(os.Args[2:])
+	case "render":
+		cmdRender(os.Args[2:])
 	case "graph":
 		cmdGraph(os.Args[2:])
 	case "explain":
@@ -121,6 +124,7 @@ func cmdCheck(args []string) {
 	offline := fs.Bool("offline", false, "skip all network calls; serve only from --cache-dir")
 	proxy := fs.String("proxy", "", "HTTP proxy URL for remote includes and GitLab API calls (e.g. http://proxy:8080); overrides system proxy env vars")
 	format := fs.String("format", "text", "output format: text, json, sarif, junit, github")
+	noWarn := fs.Bool("no-warn", false, "suppress warning findings; only errors are shown and affect the exit code")
 	branch := fs.String("branch", "", "simulate a branch push (sets CI_COMMIT_BRANCH, …)")
 	tag := fs.String("tag", "", "simulate a tag push (sets CI_COMMIT_TAG, …)")
 	source := fs.String("source", "", "set CI_PIPELINE_SOURCE")
@@ -137,7 +141,11 @@ func cmdCheck(args []string) {
 		fmt.Fprint(os.Stderr, `Lint a GitLab CI pipeline file.
 
 Resolves local includes and extends chains, then runs all lint rules.
-Exits 0 when no errors are found, 1 when at least one error is reported.
+
+Exit codes:
+  0   no findings (clean)
+  2   one or more errors
+  10  one or more warnings, no errors
 
 Usage: glint check [OPTIONS] <PIPELINE>
 
@@ -149,6 +157,10 @@ Options:
           Output format for findings.
           [default: text] [possible values: text, json, sarif, junit, github]
 
+      --no-warn
+          Suppress warning findings. Only errors are printed and counted toward
+          the exit code; warnings are ignored entirely.
+
       --token <TOKEN>
           GitLab personal access token. Required to fetch project: includes;
           component: includes are attempted unauthenticated.
@@ -402,7 +414,19 @@ Examples:
 
 	findings := linter.Lint(p, skipped)
 	findings = applyConfig(findings, glintCfg, p.Suppressions)
-	errCount, _ := countSeverities(findings)
+
+	// --no-warn: discard warnings before any output or exit-code calculation.
+	if *noWarn {
+		kept := findings[:0]
+		for _, f := range findings {
+			if f.Severity != linter.Warning {
+				kept = append(kept, f)
+			}
+		}
+		findings = kept
+	}
+
+	errCount, warnCount := countSeverities(findings)
 
 	// In structured formats the summary line goes to stderr so stdout is clean.
 	summaryOut := os.Stdout
@@ -420,19 +444,27 @@ Examples:
 	case "github":
 		writeGitHub(os.Stdout, findings)
 	default: // "text"
-		for _, f := range findings {
+		writeTextFindings(os.Stdout, findings)
-			fmt.Println(f)
-		}
 	}
 
 	if len(findings) == 0 {
 		fmt.Fprintf(summaryOut, "OK: %s — no issues found (%d job(s), %d stage(s))\n", path, len(p.Jobs), len(p.Stages))
 	} else {
+		switch {
+		case errCount > 0 && warnCount > 0:
+			fmt.Fprintf(summaryOut, "%d finding(s): %d error(s), %d warning(s)\n", len(findings), errCount, warnCount)
+		case errCount > 0:
 			fmt.Fprintf(summaryOut, "%d finding(s): %d error(s)\n", len(findings), errCount)
+		default:
+			fmt.Fprintf(summaryOut, "%d finding(s): %d warning(s)\n", len(findings), warnCount)
+		}
 	}
 
-	if errCount > 0 {
+	switch {
-		exit(1)
+	case errCount > 0:
+		exit(2)
+	case warnCount > 0:
+		exit(10)
 	}
 }
 
@@ -515,6 +547,12 @@ Options:
           Run "git diff --name-only <REF>" to determine changed files for
           rules:changes: evaluation.
 
+      --no-skipped
+          Omit jobs that would be skipped in the given context. Requires at
+          least one context flag (--branch, --tag, --source, --var) or the
+          implicit default context (branch=main). Skipped jobs are removed
+          from the tree, SVG, HTML, and Mermaid output entirely.
+
       --list-vars
           Print all pipeline-level variables collected from the root file and
           every included file (sorted KEY=VALUE) to stderr, then continue
@@ -545,6 +583,7 @@ Examples:
 	branch := fs.String("branch", "", "simulate a branch push (sets CI_COMMIT_BRANCH, …)")
 	tag := fs.String("tag", "", "simulate a tag push (sets CI_COMMIT_TAG, …)")
 	source := fs.String("source", "", "set CI_PIPELINE_SOURCE")
+	noSkipped := fs.Bool("no-skipped", false, "hide jobs that would be skipped in the given context (requires a context)")
 	listVars := fs.Bool("list-vars", false, "print all collected pipeline variables to stderr, then continue")
 	var vars multiFlag
 	fs.Var(&vars, "var", "set a CI variable as KEY=VALUE; repeatable")
@@ -633,6 +672,16 @@ Examples:
 		printVars(p, ctx)
 	}
 
+	// --no-skipped: remove jobs that evaluate to skipped in the current context
+	// before handing the pipeline to any graph function.
+	if *noSkipped && !ctx.IsEmpty() {
+		for name, job := range p.Jobs {
+			if !strings.HasPrefix(name, ".") && cicontext.EvalJob(job, ctx) == cicontext.JobSkipped {
+				delete(p.Jobs, name)
+			}
+		}
+	}
+
 	switch mode {
 	case "default":
 		fmt.Print(graph.Tree(p, ctx))

cmd/glint/main_test.go

@@ -112,7 +112,7 @@ func TestCmdCheck_MissingFile(t *testing.T) {
 	if *code != 2 { t.Errorf("missing file: want exit(2), got %d", *code) }
 }
 
-func TestCmdCheck_WithErrors_ExitsOne(t *testing.T) {
+func TestCmdCheck_WithErrors_ExitsTwo(t *testing.T) {
 	code := captureExit(t)
 	// Pipeline with an error finding (invalid stage reference)
 	content := `
@@ -123,7 +123,7 @@ test-job:
 `
 	path := writePipeline(t, content)
 	cmdCheck([]string{path})
-	if *code != 1 { t.Errorf("pipeline with errors: want exit(1), got %d", *code) }
+	if *code != 2 { t.Errorf("pipeline with errors: want exit(2), got %d", *code) }
 }
 
 func TestCmdCheck_FormatJSON(t *testing.T) {
@@ -703,10 +703,10 @@ func TestCmdCheck_ChangesFrom_Fails(t *testing.T) {
 
 	code := captureExit(t)
 	path := writePipeline(t, minimalPipeline)
-	// Should warn but not crash; pipeline is clean → no exit(1).
+	// Should warn but not crash; pipeline is clean → no exit(2).
 	cmdCheck([]string{"--changes-from", "origin/main", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("expected no exit(1) when --changes-from fails gracefully, got %d", *code)
+		t.Errorf("expected no exit(2) when --changes-from fails gracefully, got %d", *code)
 	}
 }
 
@@ -753,10 +753,10 @@ build-job:
 `
 	path := writePipeline(t, content)
 	// build-job's rule fires only if src/** matches; with 0 changed files it is skipped.
-	// Pipeline is clean (no lint errors) → no exit(1).
+	// Pipeline is clean (no lint errors) → no exit(2).
 	cmdCheck([]string{"--changes-from", "origin/main", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("unexpected exit(1): %d", *code)
+		t.Errorf("unexpected exit(2): %d", *code)
 	}
 }
 
@@ -770,8 +770,8 @@ func TestCmdGraph_ChangesFrom_Fails(t *testing.T) {
 	code := captureExit(t)
 	path := writePipeline(t, minimalPipeline)
 	cmdGraph([]string{"tree", "--changes-from", "origin/main", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("unexpected exit(1) when --changes-from fails in graph mode")
+		t.Errorf("unexpected exit(2) when --changes-from fails in graph mode")
 	}
 }
 
@@ -785,8 +785,8 @@ func TestCmdGraph_ChangesFrom_Success(t *testing.T) {
 	code := captureExit(t)
 	path := writePipeline(t, minimalPipeline)
 	cmdGraph([]string{"tree", "--changes-from", "origin/main", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("unexpected exit(1) in graph --changes-from success path")
+		t.Errorf("unexpected exit(2) in graph --changes-from success path")
 	}
 }
 
@@ -801,8 +801,8 @@ func TestCmdGraph_ChangesFrom_EmptyDiff(t *testing.T) {
 	path := writePipeline(t, minimalPipeline)
 	// reliable=true, allChanged nil → allChanged = []string{} branch hit
 	cmdGraph([]string{"tree", "--changes-from", "origin/main", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("unexpected exit(1) in graph --changes-from empty diff")
+		t.Errorf("unexpected exit(2) in graph --changes-from empty diff")
 	}
 }
 
@@ -818,8 +818,8 @@ build-job:
 `
 	path := writePipeline(t, content)
 	cmdGraph([]string{"tree", "--changes", "src/app.go", path})
-	if *code == 1 {
+	if *code == 2 {
-		t.Errorf("unexpected exit(1) with valid pipeline and --changes flag")
+		t.Errorf("unexpected exit(2) with valid pipeline and --changes flag")
 	}
 }
 
@@ -848,7 +848,7 @@ deploy-job:
 	// by rules evaluation → needs cross-check suppressed → exit 0.
 	code := captureExit(t)
 	cmdCheck([]string{"--branch", "main", path})
-	if *code == 1 {
+	if *code == 2 {
 		t.Error("skipped job's needs: error should be suppressed in context-scoped lint")
 	}
 }
@@ -873,8 +873,8 @@ deploy-job:
 
 	code := captureExit(t)
 	cmdCheck([]string{"--tag", "v1.0.0", path})
-	if *code != 1 {
+	if *code != 2 {
-		t.Error("active job's bad needs: should still produce GL027 error")
+		t.Error("active job's bad needs: should still produce GL027 error (exit 2)")
 	}
 }
 
@@ -883,7 +883,7 @@ func TestCmdCheck_ContextScopedLinting_SkippedSet_IsNilWhenAllActive(t *testing.
 	code := captureExit(t)
 	path := writePipeline(t, minimalPipeline)
 	cmdCheck([]string{"--branch", "main", path})
-	if *code == 1 {
+	if *code == 2 {
 		t.Error("valid pipeline with all-active jobs should not produce errors")
 	}
 }
@@ -1142,8 +1142,8 @@ test-job:
 `
 	path := writePipeline(t, content)
 	cmdCheck([]string{"--context", "branch=main", path})
-	if *code != 1 {
+	if *code != 2 {
-		t.Errorf("multi-context error pipeline: want exit(1), got %d", *code)
+		t.Errorf("multi-context error pipeline: want exit(2), got %d", *code)
 	}
 }
 

cmd/glint/output.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"git.k3nny.fr/glint/internal/linter"
+)
+
+// ANSI escape sequences used for colorized output.
+const (
+	ansiReset  = "\033[0m"
+	ansiBold   = "\033[1m"
+	ansiDim    = "\033[2m"
+	ansiRed    = "\033[31m"
+	ansiOrange = "\033[33m" // rendered as orange/amber in most terminals
+)
+
+// colorEnabled reports whether ANSI color should be used when writing to w.
+// Colors are suppressed when NO_COLOR is set or when w is not a terminal.
+func colorEnabled(w io.Writer) bool {
+	if os.Getenv("NO_COLOR") != "" {
+		return false
+	}
+	f, ok := w.(*os.File)
+	if !ok {
+		return false
+	}
+	fi, err := f.Stat()
+	return err == nil && (fi.Mode()&os.ModeCharDevice) != 0
+}
+
+// writeTextFindings prints findings in a columnized format with optional
+// ANSI color. All findings are scanned first to compute column widths so
+// that each field aligns across all output lines.
+//
+// Output columns (space-separated, no borders):
+//
+//	location   RULE   severity   message
+func writeTextFindings(w io.Writer, findings []linter.Finding) {
+	if len(findings) == 0 {
+		return
+	}
+
+	color := colorEnabled(w)
+
+	// Pre-compute locations and maximum location width.
+	locs := make([]string, len(findings))
+	maxLoc := 0
+	for i, f := range findings {
+		locs[i] = findingLocation(f)
+		if len(locs[i]) > maxLoc {
+			maxLoc = len(locs[i])
+		}
+	}
+
+	// Rule IDs are always 5 chars (GL001–GL999).
+	const ruleWidth = 5
+	// Severity width: "warning" = 7 chars.
+	const sevWidth = 7
+
+	for i, f := range findings {
+		loc := locs[i]
+		rule := f.Rule
+		sev := strings.ToLower(string(f.Severity))
+
+		msg := f.Message
+		if f.Job != "" {
+			msg = fmt.Sprintf("job %q: %s", f.Job, msg)
+		}
+
+		if color {
+			var sevSeq string
+			if f.Severity == linter.Error {
+				sevSeq = ansiRed + ansiBold
+			} else {
+				sevSeq = ansiOrange + ansiBold
+			}
+			fmt.Fprintf(w, "%s%-*s%s  %s%-*s%s  %s%-*s%s  %s\n",
+				ansiDim, maxLoc, loc, ansiReset,
+				ansiBold, ruleWidth, rule, ansiReset,
+				sevSeq, sevWidth, sev, ansiReset,
+				msg,
+			)
+		} else {
+			fmt.Fprintf(w, "%-*s  %-*s  %-*s  %s\n",
+				maxLoc, loc,
+				ruleWidth, rule,
+				sevWidth, sev,
+				msg,
+			)
+		}
+	}
+}
+
+// findingLocation formats the file:line:col location string for a finding.
+func findingLocation(f linter.Finding) string {
+	if f.File == "" {
+		return ""
+	}
+	switch {
+	case f.Line > 0 && f.Column > 0:
+		return fmt.Sprintf("%s:%d:%d", f.File, f.Line, f.Column)
+	case f.Line > 0:
+		return fmt.Sprintf("%s:%d", f.File, f.Line)
+	default:
+		return f.File
+	}
+}

cmd/glint/render.go

@@ -0,0 +1,269 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"git.k3nny.fr/glint/internal/config"
+	"git.k3nny.fr/glint/internal/fetcher"
+	"git.k3nny.fr/glint/internal/model"
+	"git.k3nny.fr/glint/internal/resolver"
+	"gopkg.in/yaml.v3"
+)
+
+func cmdRender(args []string) {
+	fs := flag.NewFlagSet("glint render", flag.ExitOnError)
+	output := fs.String("output", "", "output file path (default: rendered.gitlab-ci.yml; use - for stdout)")
+	token := fs.String("token", "", "GitLab personal access token (overrides GITLAB_TOKEN)")
+	gitlabURL := fs.String("gitlab-url", "", "GitLab instance URL (overrides CI_SERVER_URL / GITLAB_URL)")
+	cacheDir := fs.String("cache-dir", "", "directory to cache fetched remote includes")
+	offline := fs.Bool("offline", false, "skip all network calls; serve only from --cache-dir")
+	proxy := fs.String("proxy", "", "HTTP proxy URL for remote includes (e.g. http://proxy:8080)")
+	fs.Usage = func() {
+		fmt.Fprintf(os.Stderr, "glint %s\n\n", version)
+		fmt.Fprint(os.Stderr, `Resolve all includes and extends into a single merged YAML file.
+
+Performs the same include resolution and extends merging that GitLab CI
+does server-side, then writes the fully flattened pipeline to a single file.
+Useful for inspecting the resolved pipeline or running further local tooling.
+
+The output file strips 'include:' (consumed by resolution) and 'extends:'
+(applied to each job) keys. All other fields are preserved verbatim.
+Template jobs (names starting with '.') are retained.
+
+Usage: glint render [OPTIONS] <PIPELINE>
+
+Arguments:
+  <PIPELINE>  Path to the .gitlab-ci.yml file to resolve
+
+Options:
+      --output <FILE>
+          Write the rendered pipeline to FILE.
+          Use '-' to write to stdout.
+          [default: rendered.gitlab-ci.yml]
+
+      --token <TOKEN>
+          GitLab personal access token for fetching project: and component:
+          includes.
+          [env: GITLAB_TOKEN | CI_JOB_TOKEN | GITLAB_PRIVATE_TOKEN]
+
+      --gitlab-url <URL>
+          GitLab instance URL.
+          [env: CI_SERVER_URL | GITLAB_URL] [default: https://gitlab.com]
+
+      --cache-dir <DIR>
+          Cache directory for fetched remote includes.
+
+      --offline
+          Do not make any network calls; use cache only.
+
+      --proxy <URL>
+          HTTP proxy URL for remote includes and GitLab API calls.
+
+  -h, --help
+          Print help
+
+Examples:
+  glint render .gitlab-ci.yml
+  glint render --output merged.yml .gitlab-ci.yml
+  glint render --output - .gitlab-ci.yml | yq .
+  glint render --offline --cache-dir ~/.cache/glint .gitlab-ci.yml
+`)
+	}
+	_ = fs.Parse(args)
+
+	if fs.NArg() != 1 {
+		fs.Usage()
+		exit(2)
+		return
+	}
+	path := fs.Arg(0)
+	rootDir := filepath.Dir(filepath.Clean(path))
+
+	glintCfg, cfgErr := config.Load(rootDir)
+	if cfgErr != nil {
+		fmt.Fprintf(os.Stderr, "%s: [warning] %s: %v\n", path, config.Filename, cfgErr)
+	}
+
+	fetcherToken := *token
+	if fetcherToken == "" {
+		fetcherToken = glintCfg.Token
+	}
+	fetcherURL := *gitlabURL
+	if fetcherURL == "" {
+		fetcherURL = glintCfg.URL
+	}
+	resolvedCacheDir := *cacheDir
+	if resolvedCacheDir == "" {
+		resolvedCacheDir = glintCfg.CacheDir
+	}
+	if *offline && resolvedCacheDir == "" {
+		resolvedCacheDir = defaultCacheDir()
+	}
+	resolvedProxy := *proxy
+	if resolvedProxy == "" {
+		resolvedProxy = glintCfg.Proxy
+	}
+
+	cfg := fetcher.AutoConfig().WithOverrides(fetcherURL, fetcherToken, resolvedCacheDir, *offline).WithProxy(resolvedProxy)
+
+	p, err := model.Parse(path)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		exit(2)
+		return
+	}
+
+	warnings, _ := resolver.ResolveIncludes(p, cfg, rootDir)
+	for _, w := range warnings {
+		fmt.Fprintf(os.Stderr, "%s: [warning] include %s\n", path, w)
+	}
+
+	extWarnings, err := resolver.Resolve(p)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: resolving extends: %v\n", err)
+		exit(2)
+		return
+	}
+	for _, w := range extWarnings {
+		fmt.Fprintf(os.Stderr, "%s: [warning] job %q extends unknown job %q; extends chain skipped\n", path, w.Job, w.Base)
+	}
+
+	doc, err := buildRenderDoc(p)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: building output: %v\n", err)
+		exit(2)
+		return
+	}
+
+	outPath := *output
+	if outPath == "" {
+		outPath = "rendered.gitlab-ci.yml"
+	}
+
+	var w interface{ Write([]byte) (int, error) }
+	if outPath == "-" {
+		w = os.Stdout
+	} else {
+		f, err := os.Create(outPath)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error: creating output file: %v\n", err)
+			exit(2)
+			return
+		}
+		defer f.Close()
+		w = f
+	}
+
+	enc := yaml.NewEncoder(w)
+	enc.SetIndent(2)
+	if err := enc.Encode(doc); err != nil {
+		fmt.Fprintf(os.Stderr, "error: writing output: %v\n", err)
+		exit(2)
+		return
+	}
+	_ = enc.Close()
+
+	if outPath != "-" {
+		jobCount := 0
+		for name := range p.Jobs {
+			if !strings.HasPrefix(name, ".") {
+				jobCount++
+			}
+		}
+		fmt.Fprintf(os.Stderr, "rendered: %s (%d job(s), %d stage(s))\n", outPath, jobCount, len(p.Stages))
+	}
+}
+
+// buildRenderDoc constructs an ordered yaml.Node document from the resolved
+// pipeline. Pipeline-level keys (stages, variables, default, workflow) come
+// first, followed by template jobs (.name) then regular jobs, both sorted
+// alphabetically. 'include:' and 'extends:' are omitted — they have been
+// consumed by the resolution passes.
+func buildRenderDoc(p *model.Pipeline) (*yaml.Node, error) {
+	root := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
+
+	addField := func(key string, val any) error {
+		n, err := anyToNode(val)
+		if err != nil {
+			return fmt.Errorf("encoding %q: %w", key, err)
+		}
+		root.Content = append(root.Content,
+			&yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: key},
+			n,
+		)
+		return nil
+	}
+
+	if len(p.Stages) > 0 {
+		if err := addField("stages", p.Stages); err != nil {
+			return nil, err
+		}
+	}
+	if len(p.Variables) > 0 {
+		if err := addField("variables", p.Variables); err != nil {
+			return nil, err
+		}
+	}
+	if p.Default != nil {
+		if err := addField("default", p.Default); err != nil {
+			return nil, err
+		}
+	}
+	if p.Workflow != nil {
+		if err := addField("workflow", p.Workflow); err != nil {
+			return nil, err
+		}
+	}
+
+	// Collect and sort job names: template jobs first, then regular jobs.
+	var templates, regular []string
+	for name := range p.RawJobs {
+		if strings.HasPrefix(name, ".") {
+			templates = append(templates, name)
+		} else {
+			regular = append(regular, name)
+		}
+	}
+	sort.Strings(templates)
+	sort.Strings(regular)
+
+	for _, name := range append(templates, regular...) {
+		raw := p.RawJobs[name]
+		// Copy to avoid mutating the shared map; strip resolution-consumed keys.
+		cleaned := make(map[string]any, len(raw))
+		for k, v := range raw {
+			if k == "extends" {
+				continue
+			}
+			cleaned[k] = v
+		}
+		if err := addField(name, cleaned); err != nil {
+			return nil, err
+		}
+	}
+
+	doc := &yaml.Node{Kind: yaml.DocumentNode, Content: []*yaml.Node{root}}
+	return doc, nil
+}
+
+// anyToNode converts an arbitrary Go value to a *yaml.Node by round-tripping
+// through yaml.Marshal / yaml.Unmarshal, which preserves all value types.
+func anyToNode(v any) (*yaml.Node, error) {
+	data, err := yaml.Marshal(v)
+	if err != nil {
+		return nil, err
+	}
+	var doc yaml.Node
+	if err := yaml.Unmarshal(data, &doc); err != nil {
+		return nil, err
+	}
+	if doc.Kind == yaml.DocumentNode && len(doc.Content) > 0 {
+		return doc.Content[0], nil
+	}
+	return &doc, nil
+}

internal/linter/dependencies.go

@@ -30,6 +30,7 @@ func checkDependencies(p *model.Pipeline, skipped map[string]bool) []Finding {
 					Job:      name,
 					File:     job.File,
 					Line:     job.Line,
+					Column:   job.Column,
 					Message:  fmt.Sprintf("'dependencies' references unknown job %q", dep),
 				})
 				continue
@@ -43,6 +44,7 @@ func checkDependencies(p *model.Pipeline, skipped map[string]bool) []Finding {
 						Job:      name,
 						File:     job.File,
 						Line:     job.Line,
+						Column:   job.Column,
 						Message:  fmt.Sprintf("'dependencies' job %q must be in an earlier stage (in %q, current job is in %q)", dep, depJob.Stage, job.Stage),
 					})
 				}

internal/linter/if_reachability.go

@@ -99,6 +99,7 @@ func evalRulesReachability(name string, job model.Job, jobVars map[string]string
 		Job:      name,
 		File:     job.File,
 		Line:     job.Line,
+		Column:   job.Column,
 		Message:  "rules: block can never activate: all if: conditions evaluate to false given the declared pipeline variables",
 	}
 }

internal/linter/inherit_completeness.go

@@ -40,6 +40,7 @@ func checkJobInheritCompleteness(p *model.Pipeline, name string, job model.Job)
 			Job:      name,
 			File:     job.File,
 			Line:     job.Line,
+			Column:   job.Column,
 			Message:  "'inherit: default:' is declared but the pipeline has no 'default:' block — declaration has no effect",
 		}}
 	}
@@ -70,6 +71,7 @@ func checkJobInheritCompleteness(p *model.Pipeline, name string, job model.Job)
 		Job:      name,
 		File:     job.File,
 		Line:     job.Line,
+		Column:   job.Column,
 		Message: fmt.Sprintf(
 			"'inherit: default: [%s]': %s not defined in the 'default:' block — %s",
 			strings.Join(dead, ", "),

internal/linter/linter.go

@@ -22,15 +22,19 @@ type Finding struct {
 	Job      string // empty for pipeline-level findings
 	File     string // source file where the finding originates
 	Line     int    // line number in File (0 = unknown)
+	Column   int    // column number in File (0 = unknown; 1-indexed)
 	Message  string
 }
 
 func (f Finding) String() string {
 	var loc string
 	if f.File != "" {
-		if f.Line > 0 {
+		switch {
+		case f.Line > 0 && f.Column > 0:
+			loc = fmt.Sprintf("%s:%d:%d: ", f.File, f.Line, f.Column)
+		case f.Line > 0:
 			loc = fmt.Sprintf("%s:%d: ", f.File, f.Line)
-		} else {
+		default:
 			loc = fmt.Sprintf("%s: ", f.File)
 		}
 	}
@@ -225,6 +229,7 @@ func checkJob(name string, job model.Job, stageSet map[string]bool) []Finding {
 		if findings[i].Job != "" && findings[i].File == "" {
 			findings[i].File = job.File
 			findings[i].Line = job.Line
+			findings[i].Column = job.Column
 		}
 	}
 	return findings

internal/linter/needs.go

@@ -53,6 +53,7 @@ func checkNeeds(p *model.Pipeline, skipped map[string]bool) []Finding {
 					Job:      name,
 					File:     job.File,
 					Line:     job.Line,
+					Column:   job.Column,
 					Message:  fmt.Sprintf("needs unknown job %q", entry.job),
 				})
 				continue
@@ -71,6 +72,7 @@ func checkNeeds(p *model.Pipeline, skipped map[string]bool) []Finding {
 						Job:      name,
 						File:     job.File,
 						Line:     job.Line,
+						Column:   job.Column,
 						Message: fmt.Sprintf(
 							"needs %q which is in a later stage (%q after %q)",
 							entry.job, neededJob.Stage, job.Stage,
@@ -111,6 +113,7 @@ func checkRulesNeeds(p *model.Pipeline, skipped map[string]bool) []Finding {
 						Job:      name,
 						File:     job.File,
 						Line:     job.Line,
+						Column:   job.Column,
 						Message: fmt.Sprintf(
 							"rules[%d].needs: references unknown job %q",
 							i, entry.job,
@@ -171,6 +174,7 @@ func detectNeedsCycles(graph map[string][]string, jobs map[string]model.Job) []F
 					Job:      name,
 					File:     j.File,
 					Line:     j.Line,
+					Column:   j.Column,
 					Message:  fmt.Sprintf("circular dependency in needs: %v → %s", path, name),
 				})
 			}

internal/linter/variables.go

@@ -148,6 +148,7 @@ func checkVariableRefs(p *model.Pipeline) []Finding {
 					Job:      name,
 					File:     job.File,
 					Line:     job.Line,
+					Column:   job.Column,
 					Message:  fmt.Sprintf("rules[%d].if: $%s is not declared in pipeline or job variables:", i, varName),
 				})
 			}

internal/model/parser.go

@@ -84,6 +84,7 @@ func ParseBytes(data []byte) (*Pipeline, error) {
 		}
 		j.Name = key
 		j.Line = keyNode.Line     // exact line of the job name key
+		j.Column = keyNode.Column // exact column of the job name key
 		p.Jobs[key] = j
 	}
 

internal/model/pipeline.go

@@ -48,6 +48,7 @@ type Job struct {
 	Name   string // set by parser, not from YAML
 	File   string // source file; set by Parse / resolver
 	Line   int    // line of the job key in its source file; set by parser
+	Column int    // column of the job key (1-indexed); set by parser
 	Stage        string   `yaml:"stage"`
 	Script       any `yaml:"script"`       // []string or string (block scalar)
 	Run          any `yaml:"run"`          // alternative to script (CI steps)

internal/resolver/extends.go

@@ -80,12 +80,15 @@ func Resolve(p *model.Pipeline) ([]ExtendWarning, error) {
 			return extWarnings, fmt.Errorf("job %q: re-decoding merged definition: %w", name, err)
 		}
 		j.Name = name
-		// Preserve source location — File/Line are not part of the YAML map
+		// Preserve source location — these fields are not part of the YAML map
 		// and are lost during the encode/decode round-trip.
 		orig := p.Jobs[name]
 		j.File = orig.File
 		j.Line = orig.Line
+		j.Column = orig.Column
 		p.Jobs[name] = j
+		// Write merged raw map back so p.RawJobs always reflects post-extends state.
+		p.RawJobs[name] = merged
 	}
 
 	return extWarnings, nil