{"record":{"id":"90ece146d3ce3a9d","repo":"charmbracelet/glow","slug":"unable-to-render-markdown-w","errorCode":null,"errorMessage":"unable to render markdown: %w","messagePattern":"unable to render markdown: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"main.go","lineNumber":311,"sourceCode":"\tr, err := glamour.NewTermRenderer(\n\t\tutils.GlamourStyle(style, isCode),\n\t\tglamour.WithWordWrap(int(width)), //nolint:gosec\n\t\tglamour.WithBaseURL(baseURL),\n\t\tglamour.WithPreservedNewLines(),\n\t)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"unable to create renderer: %w\", err)\n\t}\n\n\tcontent := string(b)\n\text := filepath.Ext(src.URL)\n\tif isCode {\n\t\tcontent = utils.WrapCodeBlock(string(b), ext)\n\t}\n\n\tout, err := r.Render(content)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"unable to render markdown: %w\", err)\n\t}\n\n\t// display\n\tswitch {\n\tcase pager || cmd.Flags().Changed(\"pager\"):\n\t\tpagerCmd := os.Getenv(\"PAGER\")\n\t\tif pagerCmd == \"\" {\n\t\t\tpagerCmd = \"less -r\"\n\t\t}\n\n\t\tfields, err := shell.Fields(pagerCmd, os.Getenv)\n\t\tif err != nil || len(fields) == 0 {\n\t\t\treturn fmt.Errorf(\"unable to parse PAGER command: %s\", pagerCmd)\n\t\t}\n\t\tc := exec.Command(fields[0], fields[1:]...) //nolint:gosec\n\t\tc.Stdin = strings.NewReader(out)\n\t\tc.Stdout = os.Stdout\n\t\tif err := c.Run(); err != nil {","sourceCodeStart":293,"sourceCodeEnd":329,"githubUrl":"https://github.com/charmbracelet/glow/blob/e3970c813d93da1ea84edfca90c289d9afb82242/main.go#L293-L329","documentation":"r.Render(content) runs the (possibly code-wrapped) markdown through glamour's goldmark-based ANSI renderer. It fails when the render pipeline errors - typically a malformed custom style that survives construction but breaks at render time, or an edge case in the content. With built-in styles this error is rare.","triggerScenarios":"Custom style missing required entries at render time; pathological or extremely large markdown exhausting memory; glamour version incompatible with the style file's keys; embedded content triggering a renderer error path.","commonSituations":"After upgrading glow/glamour with old custom styles, rendering documents with unusual constructs (huge tables, deeply nested blocks), styles copied from a different glamour major version.","solutions":["Retry with a built-in style: glow -s dark <file>","Bisect the markdown: split the file to find the block that triggers the failure","Rebuild the custom style from the current default style template for your glamour version","Report upstream at charmbracelet/glamour if a minimal repro fails with built-in styles"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"out, err := r.Render(content)\nif err != nil {\n\tfb, ferr := glamour.NewTermRenderer(glamour.WithStandardStyle(\"dark\"))\n\tif ferr == nil {\n\t\tif out2, rerr := fb.Render(content); rerr == nil {\n\t\t\tout = out2\n\t\t\terr = nil\n\t\t}\n\t}\n}\nif err != nil { return fmt.Errorf(\"unable to render markdown: %w\", err) }","preventionTips":["Soak-test custom styles against real-world documents","Fall back to a standard style when custom-style rendering fails","Update or regenerate style files when bumping glamour versions"],"tags":["glamour","rendering","markdown"],"backgroundTag":null,"analyzedSha":"e3970c813d93da1ea84edfca90c289d9afb82242","analyzedAt":"2026-08-15T22:50:54.304Z","schemaVersion":2},"datasetVersion":"2026-08-16T03:17:38.424Z"}