func create: Hyphen-prefixed names mis-parsed as flags

[RayyanSeliya]

Problem

When running func create with function names starting with a hyphen, the command mis-parses them as flags, resulting in confusing error messages that don't clearly indicate the naming issue.

Current Behavior

Scenario 1: Function name starting with hyphen (template flag conflict)

Command:

func create --language go -test-func

Current Output:

Error: The template 'est-func' was not found for language runtime 'go'.
Available templates for this language runtime are:
  cloudevents
  http

Problems:

• Leading hyphen - interpreted as flag prefix
• CLI parsed -t from -test-func as the --template short flag
• Remaining text est-func used as template name
• Error message doesn't mention the naming issue
• No guidance that function names cannot start with hyphens

Scenario 2: Function name starting with hyphen (language flag conflict)

Command:

func create --language go -language-test

Current Output:

Error: The language runtime 'anguage-test' is not recognized.
Available language runtimes are:
  go
  node
  python
  quarkus
  rust
  springboot
  typescript

Problems:

• CLI parsed -l from -language-test as the --language short flag
• Remaining text anguage-test used as runtime name
• Error message about invalid runtime instead of invalid name format
• No indication that the argument was mis-parsed

Scenario 3: Function name starting with hyphen (invalid short flag)

Command:

func create --language go -custom-func

Current Output:

Error: unknown shorthand flag: 'u' in -ustom-func

Problems:

• CLI parsed -c from -custom-func (no matching short flag exists)
• Shows cryptic "unknown shorthand flag: 'u'" error
• User doesn't understand why 'u' is being parsed as a flag
• No guidance on valid naming rules

Scenario 4: Function name starting with double hyphen

Command:

func create --language go --production-func

Current Output:

Error: unknown flag: --production-func

Problems:

• Double hyphen -- interpreted as long flag prefix
• Generic "unknown flag" error
• No indication this was meant to be a function name
• No guidance on DNS-1035 naming rules

Scenario 5: Function name starting with hyphen and number

Command:

func create --language go -123

Current Output:

Error: unknown shorthand flag: '1' in -123

Problems:

• Hyphen followed by number parsed as invalid short flag
• Confusing error about flag '1'
• No indication that numbers can't be flags
• No guidance on valid function naming

Proposed Improvement

All scenarios above should display the original error message followed by a helpful note explaining the mis-parsing and DNS-1035 naming rules.

Example (Scenario 1):

Command:

func create --language go -test-func

Improved Output:

Error: The template 'est-func' was not found for language runtime 'go'.
Available templates for this language runtime are:
  cloudevents
  http

Note: It looks like '-test-func' was interpreted as the flag '-t' with value 'est-func'.
Function names cannot start with hyphens per DNS-1035 naming rules.
Valid function names must start with a letter (a-z) and can contain letters, numbers, and hyphens.

[RayyanSeliya]

/kind bug