[Feature] Greatly improved forms with dbt profile browsing (#8)

This PR greatly improves the forms that compose the TUI, based on
feedback from the dbt Labs DX team.

- Now unified into one form with conditional visibility rather than
multiple forms with conditional logic
- This allows shift+tab and tab to back/forward through the entire thing
- Validated input to prevent entering blank values
- Default values where sensible so you can Just Hit Enter
- We fetch all the dbt profiles before the form runs, so you can browse
them rather than trying to enter the name correctly, this will error
early if there are parsing issues with the profiles rather than after
you fill out the form

fetch_dbt_profiles.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v2"
+)
+
+type DbtProfile struct {
+	Target  string `yaml:"target"`
+	Outputs map[string]struct {
+		ConnType      string `yaml:"type"`
+		Account       string `yaml:"account"`
+		User          string `yaml:"user"`
+		Role          string `yaml:"role"`
+		Authenticator string `yaml:"authenticator"`
+		Database      string `yaml:"database"`
+		Schema        string `yaml:"schema"`
+		Project       string `yaml:"project"`
+		Dataset       string `yaml:"dataset"`
+		Path          string `yaml:"path"`
+		Threads       int    `yaml:"threads"`
+	} `yaml:"outputs"`
+}
+
+type DbtProfiles map[string]DbtProfile
+
+func FetchDbtProfiles() (DbtProfiles, error) {
+	paths := []string{
+		filepath.Join(".", "profiles.yml"),
+		filepath.Join(os.Getenv("HOME"), ".dbt", "profiles.yml"),
+	}
+	ps := DbtProfiles{}
+	for _, path := range paths {
+		pf := DbtProfiles{}
+		yf, err := os.ReadFile(path)
+		if err != nil {
+			continue
+		}
+		if err = yaml.Unmarshal(yf, pf); err != nil {
+			log.Fatalf("Could not read dbt profile, \nlikely unsupported fields or formatting issues\n please open an issue: %v\n", err)
+		}
+		for k, v := range pf {
+			ps[k] = v
+		}
+	}
+	return ps, nil
+}

fetch_dbt_profiles_test.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"os"
+	"testing"
+)
+
+func TestFetchDbtProfiles(t *testing.T) {
+	CreateTempDbtProfiles(t)
+	defer os.RemoveAll(os.Getenv("HOME"))
+	defer os.Unsetenv("HOME")
+	profiles, err := FetchDbtProfiles()
+	if err != nil {
+		t.Fatalf("Error fetching dbt profiles: %v\n", err)
+	}
+	if err != nil {
+		t.Fatalf("Error fetching dbt profiles: %v\n", err)
+	}
+	if profiles["elf"].Outputs["dev"].ConnType != "snowflake" {
+		t.Fatalf("Expected snowflake, got %s\n", profiles["elf"].Outputs["dev"].ConnType)
+	}
+	if profiles["human"].Outputs["dev"].ConnType != "bigquery" {
+		t.Fatalf("Expected bigquery, got %s\n", profiles["human"].Outputs["dev"].ConnType)
+	}
+	if profiles["dwarf"].Outputs["dev"].ConnType != "duckdb" {
+		t.Fatalf("Expected duckdb, got %s\n", profiles["dwarf"].Outputs["dev"].ConnType)
+	}
+}