feat: allow -q initial query to work with -i input files

[dlevy-msft-sql]

Summary

This PR allows the -q (initial query) flag to be used with -i (input files), enabling users to set session options before running scripts.

Changes

• Modified validation to only block -i with -Q (not -q)
• Updated run logic to execute -q first, then process -i files
• Updated -i flag description to document the new behavior
• Added tests for the combined usage

Usage

# Set session options before running a script
sqlcmd -S server -q "SET PARSEONLY ON" -i script.sql

# Set multiple session options
sqlcmd -S server -q "SET NOCOUNT ON; SET ANSI_NULLS ON" -i script.sql

The initial query runs first, then the input files are processed.

Notes

• The -Q flag (query and exit) remains mutually exclusive with -i since -Q causes sqlcmd to exit immediately after the query
• This aligns with ODBC sqlcmd behavior

Fixes #389

[Copilot]

Pull request overview

This PR enables the -q (initial query) flag to work alongside -i (input files), allowing users to set session options before running scripts. Previously, -q was mutually exclusive with -i, but now the initial query runs first, followed by the input files. The -Q (query and exit) flag remains mutually exclusive with -i as expected.

Changes:

• Modified validation to allow -i with -q while keeping -i and -Q mutually exclusive
• Updated run logic to execute -q before processing -i files
• Updated flag descriptions and documentation

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
cmd/sqlcmd/sqlcmd.go	Modified validation logic to distinguish between -q and -Q, updated run logic to execute initial query before input files, and updated flag description
cmd/sqlcmd/sqlcmd_test.go	Updated test expectations to reflect that only -Q (not -q) is mutually exclusive with -i, added test for -q with -i combination
README.md	Added documentation for the new feature with example usage

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.