Flow includes a package-agnostic renderer at github.com/nexssp/flow/template that uses Go's standard text/template syntax with no additional dependencies.
Render(source, variables) uses Go's standard text/template syntax and has no additional dependencies. Values stay data: text inserted from a variable is not parsed again as template source, and the function never invokes a shell.
import flowtemplate "github.com/nexssp/flow/template"
result, err := flowtemplate.Render(
"Hello {{.name}} ({{.profile.city}})",
map[string]any{
"name": "srcpack",
"profile": map[string]any{"city": "Warsaw"},
},
)The result is plain text, not HTML-escaped output; use an HTML-specific renderer when HTML context escaping is required. A referenced missing map key (for example, .name when name is absent) is an execution error. Invalid syntax and unknown template functions are parse errors. errors.Is(err, flowtemplate.ErrExecute) and errors.Is(err, flowtemplate.ErrParse) distinguish these categories.
Extra keys are intentionally accepted and ignored if the template does not use them, so callers can reuse larger variable maps. On failure, the result is empty; partial output is not returned. A nil variable map is treated as empty.
An optional Flow adapter is available from github.com/nexssp/flow/extensions/template. It exposes template.render with {template, variables} input.
The adapter is not added to the stock CLI's built-in import list: a Flow distribution must import this bundle or require it as an extension. The standalone Go API does not depend on Flow's bundle or action packages.