feat(sql-migrate): add installer

sql-migrate/README.md

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+---
+title: sql-migrate
+homepage: https://github.com/therootcompany/golib/tree/main/cmd/sql-migrate
+tagline: |
+  sql-migrate: A lightweight, feature-branch-friendly SQL migrator.
+---
+
+To update or switch versions, run `webi sql-migrate@stable` (or `@v2`, `@beta`,
+etc).
+
+### Files
+
+These are the files that are created and/or modified with this installer:
+
+```text
+~/.config/envman/PATH.env
+~/.local/bin/sql-migrate
+~/.local/opt/sql-migrate-VERSION/bin/sql-migrate
+
+<PROJECT-DIR>/migrations.log
+<PROJECT-DIR>/sql/migrations/<yyyy-mm-dd>-<number>_<name>.<up|down>.sql
+```
+
+## Cheat Sheet
+
+> `sql-migrate` is a lightweight migration tool that gets out of your way - it
+> works with your existing SQL tools and allows working with distinct sets of
+> migrations, such as is typical in feature branches.
+
+### How to use sql-migrate
+
+Migration commands output a POSIX shell script which should be run with `sh`.
+
+`init`, `sync`, `up`, `down`, `list`, `status`
+
+```sh
+# Initialize a migration directory
+sql-migrate -d ./sql/migrations/ init --sql-command psql
+
+# Export ENVs for your database
+export PG_URL='postgres://user:pass@example.com/dbname?sslmode=require&sslnegotiation=direct'
+
+# Create a new migration (auto-generates up/down pair with incrementing number)
+sql-migrate -d ./sql/migrations/ create add-users-table
+
+# SELECT and log existing migrations
+sql-migrate -d ./sql/migrations/ sync | sh
+
+# Run all pending migrations up
+sql-migrate -d ./sql/migrations/ up | sh
+
+# Run 3 migrations up
+sql-migrate -d ./sql/migrations/ up 3 | sh
+
+# Run 1 migration down (roll back)
+sql-migrate -d ./sql/migrations/ down | sh
+
+# Run 2 migrations down
+sql-migrate -d ./sql/migrations/ down 2 | sh
+
+# List all migrations
+sql-migrate -d ./sql/migrations/ list
+
+# See which migrations have been applied
+sql-migrate -d ./sql/migrations/ status
+```
+
+### Migration directory layout
+
+Migrations follow the naming format
+`<yyyy-mm-dd>-<number>_<name>.<up|down>.sql`:
+
+```text
+sql/
+├── migrations.log                                # transaction log (auto-managed)
+└── migrations/
+    ├── 0001-01-01-001000_init-migrations.up.sql  # generated by 'init' (has config vars)
+    ├── 2021-02-03-001000_init-app.up.sql
+    ├── 2021-02-03-001000_init-app.down.sql
+    ├── 2021-02-03-002000_add-products.up.sql
+    ├── 2021-02-03-002000_add-products.down.sql
+    └── 2021-02-03-003000_add-customers.up.sql
+```
+
+The initial `0001-01-01-001000_init-migrations.up.sql` migration contains
+configuration variables:
+
+```sql
+-- migrations_log: ./sql/migrations.log
+-- sql_command: psql "$PG_URL" -v ON_ERROR_STOP=on --no-align --tuples-only --file %s
+```
+
+Environment variables by database:
+
+- PostgreSQL: `PG_URL` (auth url), `PGOPTIONS` (to set `schema` and other
+  specific options)
+- SQLite3: `SQLITE_PATH`
+- SQL Server: `SQLCMDSERVER`, `SQLCMDDATABASE`, `SQLCMDUSER`, `SQLCMDPASSWORD`
+- MySQL / MariaDB: `MY_CNF` (path to `my.cnf`, containing credentials)
+
+### Database client compatibility
+
+The `--sql-command` flag tells sql-migrate how to talk to your database:
+
+```sh
+sql-migrate -d ./sql/migrations/ init --sql-command psql
+```
+
+The following clients are known and will have the correct options applied:
+
+- psql (PostgreSQL)
+- sqlite3
+- sqlcmd (mssql / Microsoft SQL Server)
+- mariadb / mysql
+
+Since the migrations run via shell commands, you can make `sql-migrate`
+compatible with any SQL client by setting `sql_command` in
+`migrations/0001-01-01-001000_init-migrations.up.sql`.

sql-migrate/SKILL.md

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+---
+name: sql-migrate
+description:
+  Manage SQL database migrations as plain .sql files with a transaction log. Use
+  when asked about sql-migrate, database migrations, or how to set up migration
+  tooling.
+---
+
+# sql-migrate (CLI)
+
+The agent skill is embedded in the help output.
+
+Run `sql-migrate --help` use its output to guide usage decisions.
+
+The `up`, `down`, and `sync` subcommands produce POSIX shell scripts - pipe them
+to `sh` to run.
+
+## Migration layout
+
+Migrations follow the naming format
+`<yyyy-mm-dd>-<number>_<name>.<up|down>.sql`:
+
+```
+sql/
+├── migrations.log                                # transaction log (auto-managed)
+└── migrations/
+    ├── 0001-01-01-001000_init-migrations.up.sql  # generated by 'init'
+    ├── 2021-02-03-001000_init-app.up.sql
+    ├── 2021-02-03-001000_init-app.down.sql
+    └── ...
+```
+
+The initial migration file contains configuration variables:
+
+```sql
+-- migrations_log: ./sql/migrations.log
+-- sql_command: psql "$PG_URL" -v ON_ERROR_STOP=on --no-align --tuples-only --file %s
+```
+
+## Migration file structure
+
+The migration files contain their own management, including a randomly-generated
+id:
+
+```sql
+-- change_me (up)
+SELECT 'place your UP migration here';
+
+-- leave this as the last line
+INSERT INTO _migrations (name, id) VALUES ('2026-05-27-002000_change_me', 'e22295e5');
+```
+
+## Environment variables by database
+
+- PostgreSQL: `PG_URL` (auth URL), `PGOPTIONS` (set `schema` and other options)
+- SQLite3: `SQLITE_PATH`
+- SQL Server: `SQLCMDSERVER`, `SQLCMDDATABASE`, `SQLCMDUSER`, `SQLCMDPASSWORD`
+- MySQL / MariaDB: `MY_CNF` (path to `my.cnf` containing credentials)
+
+## SQL client extensibility
+
+The `--sql-command` flag tells sql-migrate how to talk to your database. Known
+clients (`psql`, `sqlite3`, `sqlcmd`, `mariadb`/`mysql`) have correct options
+applied automatically. Since migrations run via shell commands, you can make
+sql-migrate compatible with any SQL client by setting `sql_command` in the init
+migration file.
+
+# sqlmigrate (Go module)
+
+See `go doc` for each independent module (golib is a monorepo):
+
+- `github.com/therootcompany/golib/database/sqlmigrate/v2`
+  - `github.com/therootcompany/golib/database/sqlmigrate/pgmigrate`
+  - `github.com/therootcompany/golib/database/sqlmigrate/litemigrate`
+  - `github.com/therootcompany/golib/database/sqlmigrate/msmigrate`
+  - `github.com/therootcompany/golib/database/sqlmigrate/mymigrate`
+
+DO NOT search the parent golib module.

sql-migrate/install.ps1

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+#!/usr/bin/env pwsh
+
+######################
+# Install sql-migrate #
+######################
+
+$pkg_cmd_name = "sql-migrate"
+
+$pkg_dst_cmd = "$Env:USERPROFILE\.local\bin\sql-migrate.exe"
+$pkg_dst = "$pkg_dst_cmd"
+
+$pkg_src_cmd = "$Env:USERPROFILE\.local\opt\sql-migrate-v$Env:WEBI_VERSION\bin\sql-migrate.exe"
+$pkg_src_bin = "$Env:USERPROFILE\.local\opt\sql-migrate-v$Env:WEBI_VERSION\bin"
+$pkg_src_dir = "$Env:USERPROFILE\.local\opt\sql-migrate-v$Env:WEBI_VERSION"
+$pkg_src = "$pkg_src_cmd"
+
+New-Item "$Env:USERPROFILE\Downloads\webi" -ItemType Directory -Force | Out-Null
+$pkg_download = "$Env:USERPROFILE\Downloads\webi\$Env:WEBI_PKG_FILE"
+
+# Fetch archive
+if (!(Test-Path -Path "$Env:USERPROFILE\Downloads\webi\$Env:WEBI_PKG_FILE")) {
+    Write-Output "Downloading sql-migrate from $Env:WEBI_PKG_URL to $pkg_download"
+    & curl.exe -A "$Env:WEBI_UA" -fsSL "$Env:WEBI_PKG_URL" -o "$pkg_download.part"
+    & Move-Item "$pkg_download.part" "$pkg_download"
+}
+
+if (!(Test-Path -Path "$pkg_src_cmd")) {
+    Write-Output "Installing sql-migrate"
+
+    Push-Location .local\tmp
+
+    Remove-Item -Path ".\sql-migrate-v*" -Recurse -ErrorAction Ignore
+    Remove-Item -Path ".\sql-migrate.exe" -Recurse -ErrorAction Ignore
+
+    Write-Output "Unpacking $pkg_download"
+    & tar xf "$pkg_download"
+
+    Write-Output "Install Location: $pkg_src_cmd"
+    New-Item "$pkg_src_bin" -ItemType Directory -Force | Out-Null
+    Move-Item -Path ".\sql-migrate.exe" -Destination "$pkg_src_bin"
+
+    Pop-Location
+}
+
+Write-Output "Copying into '$pkg_dst_cmd' from '$pkg_src_cmd'"
+Remove-Item -Path "$pkg_dst_cmd" -Recurse -ErrorAction Ignore | Out-Null
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse

sql-migrate/install.sh

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+#!/bin/sh
+# shellcheck disable=SC2034
+
+set -e
+set -u
+
+__init_sql_migrate() {
+    pkg_cmd_name="sql-migrate"
+
+    pkg_dst_cmd="${HOME}/.local/bin/sql-migrate"
+    pkg_dst="${pkg_dst_cmd}"
+
+    pkg_src_cmd="${HOME}/.local/opt/sql-migrate-v${WEBI_VERSION}/bin/sql-migrate"
+    pkg_src_dir="${HOME}/.local/opt/sql-migrate-v${WEBI_VERSION}"
+    pkg_src="${pkg_src_cmd}"
+
+    pkg_install() {
+        pkg_src_bin=$(dirname "${pkg_src_cmd}")
+        mkdir -p "${pkg_src_bin}"
+        mv ./sql-migrate "${pkg_src_cmd}"
+    }
+
+    # pkg_get_current_version is recommended, but (soon) not required
+    pkg_get_current_version() {
+        # 'sql-migrate version' has output in this format:
+        #       sql-migrate v0.0.0-dev 0000000 (0001-01-01)
+        # This trims it down to just the version number:
+        #       v0.0.0-dev
+        sql-migrate version 2> /dev/null | head -n 1 | cut -d ' ' -f 2
+    }
+}
+
+__init_sql_migrate

sql-migrate/releases.conf

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+github_releases = therootcompany/golib
+tag_prefix = cmd/sql-migrate/v