Issue 82/comment default config (#87)

* Remove _ prefix to variables

* Update README.md: align with default config

* -printcfg shows commented configuration

* Remove unused formater.go

* Move config-related in config.go

* tmux: remove DefaultCfg variable

The default configuration is now defined in an embedded file
with comments.

Fixes #82

Author: arl

.gitmux.yml

@@ -0,0 +1,81 @@
+tmux:
+    # The symbols section defines the symbols printed before specific elements
+    # of Git status displayed in tmux status string.
+    symbols:
+        # current branch name.
+        branch: "⎇ "
+        # Git SHA1 hash (in 'detached' state).
+        hashprefix: ":"
+        # 'ahead count' when local and remote branch diverged.
+        ahead: ↑·
+        # 'behind count' when local and remote branch diverged.
+        behind: ↓·
+        # count of files in the staging area.
+        staged: "● "
+        # count of files in conflicts.
+        conflict: "✖ "
+        # count of modified files.
+        modified: "✚ "
+        # count of untracked files.
+        untracked: "… "
+        # count of stash entries.
+        stashed: "⚑ "
+        # count of inserted lines (stats section).
+        insertions: Σ
+        # count of deleted lines (stats section).
+        deletions: Δ
+        # Shown when the working tree is clean.
+        clean: ✔
+
+    # Styles are tmux format strings used to specify text colors and attributes
+    # of Git status elements. See the STYLES section of tmux man page.
+    # https://man7.org/linux/man-pages/man1/tmux.1.html#STYLES.
+    styles:
+        # Clear previous style.
+        clear: "#[fg=default]"
+        # Special tree state strings such as [rebase], [merge], etc.
+        state: "#[fg=red,bold]"
+        # Local branch name
+        branch: "#[fg=white,bold]"
+        # Remote branch name
+        remote: "#[fg=cyan]"
+        # 'divergence' counts
+        divergence: "#[fg=yellow]"
+        # 'staged' count
+        staged: "#[fg=green,bold]"
+        # 'conflicts' count
+        conflict: "#[fg=red,bold]"
+        # 'modified' count
+        modified: "#[fg=red,bold]"
+        # 'untracked' count
+        untracked: "#[fg=magenta,bold]"
+        # 'stash' count
+        stashed: "#[fg=cyan,bold]"
+        # 'insertions' count
+        insertions: "#[fg=green]"
+        # 'deletions' count
+        deletions: "#[fg=red]"
+        # 'clean' symbol
+        clean: "#[fg=green,bold]"
+
+    # The layout section defines what components gitmux shows and the order in
+    # which they appear on tmux status bar.
+    #
+    # Allowed components:
+    #  - branch:            local branch name. Examples: `⎇ main`, `⎇ :345e7a0` or `[rebase]`
+    #  - remote-branch:     remote branch name, for example: `origin/main`.
+    #  - divergence:        divergence between local and remote branch, if any. Example: `↓·2↑·1`
+    #  - remote:            alias for `remote-branch` followed by `divergence`, for example: `origin/main ↓·2↑·1`
+    #  - flags:             symbols representing the working tree state, for example `✚ 1 ⚑ 1 … 2`
+    #  - stats:             insertions/deletions (lines), for example`Σ56 Δ21`
+    #  - some string `foo`: any other character of string is directly shown, for example `foo` or `|`
+    layout: [branch, " ", remote-branch, divergence, " - ", flags]
+
+    # Additional configuration options.
+    options:
+        # Maximum displayed length for local and remote branch names.
+        branch_max_len: 0
+        # Trim left or right end of the branch (`right` or `left`).
+        branch_trim: right
+        # Character indicating whether and where a branch was truncated.
+        ellipsis: …

README.md

@@ -156,51 +156,54 @@ In `tmux` status bar, `gitmux` output immediately reflects the changes you make
 
 ### Symbols
 
-The `symbols` section describes the symbols `gitmux` prints for the various components of the status string.
+The `symbols` section defines the symbols printed before specific elements
+of Git status displayed in `tmux` status string:
 
 ```yaml
   symbols:
-    branch: '⎇ '     # Shown before a branch
-    hashprefix: ':'   # Shown before a Git hash (in 'detached HEAD' state)
-    ahead: ↑·         # Shown before the 'ahead count' when local and remote branch diverge
-    behind: ↓·        # Shown before the 'behind count' when local/remote branch diverge
-    staged: '● '      # Shown before the 'staged' files count
-    conflict: '✖ '    # Shown before the 'conflicts' count
-    modified: '✚ '    # Shown before the 'modified' files count
-    untracked: '… '   # Shown before the 'untracked' files count
-    stashed: '⚑ '     # Shown before the 'stash' count
-    insertions: Σ     # Shown before the count of insertied lines (stats sections).
-    deletions: Δ      # Shown before the count of deletions lines (stats sections). 
-    clean: ✔          # Shown when the working tree is clean (empty staging area)
+        branch: "⎇ "    # current branch name.
+        hashprefix: ":"  # Git SHA1 hash (in 'detached' state).
+        ahead: ↑·        # 'ahead count' when local and remote branch diverged.
+        behind: ↓·       # 'behind count' when local and remote branch diverged.
+        staged: "● "     # count of files in the staging area.
+        conflict: "✖ "   # count of files in conflicts.
+        modified: "✚ "   # count of modified files.
+        untracked: "… "  # count of untracked files.
+        stashed: "⚑ "    # count of stash entries.
+        insertions: Σ    # count of inserted lines (stats section).
+        deletions: Δ     # count of deleted lines (stats section).
+        clean: ✔         # Shown when the working tree is clean.
 ```
 
 
 ### Styles
 
-Styles are tmux format strings used to specify text colors and attributes.
-See [`tmux` styles reference](https://man7.org/linux/man-pages/man1/tmux.1.html#STYLES).
+Styles are tmux format strings used to specify text colors and attributes of Git
+status elements.
+See the [`STYLES` section](https://man7.org/linux/man-pages/man1/tmux.1.html#STYLES) of `tmux` man page.
 
 ```yaml
   styles:
-    clear: '#[fg=default]'          # Style clearing previous styles (printed before each component)
-    state: '#[fg=red,bold]'         # Style of the special states strings like [rebase], [merge], etc.
-    branch: '#[fg=white,bold]'      # Style of the local branch name
-    remote: '#[fg=cyan]'            # Style of the remote branch name
-    divergence: "#[fg=yellow]"      # Style of the 'divergence' string
-    staged: '#[fg=green,bold]'      # Style of the 'staged' files count
-    conflict: '#[fg=red,bold]'      # Style of the 'conflicts' count
-    modified: '#[fg=red,bold]'      # Style of the 'modified' files count
-    untracked: '#[fg=magenta,bold]' # Style of the 'modified' files count
-    stashed: '#[fg=cyan,bold]'      # Style of the 'stash' entries count
-    insertions: '#[fg=green]'       # Style of the 'inserted lines' count
-    deletions: '#[fg=red]'          # Style of the 'deleted lines' count
-    clean: '#[fg=green,bold]'       # Style of the 'clean' symbol
+    clear: '#[fg=default]'          # Clear previous style.
+    state: '#[fg=red,bold]'         # Special tree state strings such as [rebase], [merge], etc.
+    branch: '#[fg=white,bold]'      # Local branch name
+    remote: '#[fg=cyan]'            # Remote branch name
+    divergence: "#[fg=yellow]"      # 'divergence' counts
+    staged: '#[fg=green,bold]'      # 'staged' count
+    conflict: '#[fg=red,bold]'      # 'conflicts' count
+    modified: '#[fg=red,bold]'      # 'modified' count
+    untracked: '#[fg=magenta,bold]' # 'untracked' count
+    stashed: '#[fg=cyan,bold]'      # 'stash' count
+    insertions: '#[fg=green]'       # 'insertions' count
+    deletions: '#[fg=red]'          # 'deletions' count
+    clean: '#[fg=green,bold]'       # 'clean' symbol
 ```
 
 ### Layout components
 
-The layout is a list of the components `gitmux` shows, and the order in
-which they appear on `tmux` status bar.
+The `layout` section defines what components `gitmux` shows and the order in which
+they appear on `tmux` status bar.
+
 
 For example, the default `gitmux` layout shows is:
 
@@ -223,18 +226,17 @@ the remote branch, etc.
 But you can anyway choose to never show some components if you wish, or to present
 them in a different order.
 
-This is the list of the possible components of the `layout`:
+This is the list of the possible keywords for `layout`:
 
-| Layout component | Description                                        |       Example        |
+| Layout keywords  | Description                                        |       Example        |
 | :--------------: | :------------------------------------------------- | :------------------: |
 |     `branch`     | local branch name                                  |        `main`        |
 | `remote-branch`  | remote branch name                                 |    `origin/main`     |
 |   `divergence`   | divergence local/remote branch, if any             |       `↓·2↑·1`       |
 |     `remote`     | alias for `remote-branch` followed by `divergence` | `origin/main ↓·2↑·1` |
 |     `flags`      | Symbols representing the working tree state        |    `✚ 1 ⚑ 1 … 2`     |
-|     `stats`      | Insertions/deletions (lines). Disabled by deafult  |      `Σ56 Δ21`       |
-| any string `foo` | Any other string is directly shown                 |        `foo`         |
-
+|     `stats`      | Insertions/deletions (lines). Disabled by default  |      `Σ56 Δ21`       |
+| any string `foo` | Non-keywords are shown as-is                       |    `hello gitmux`    |
 
 
 Some example layouts:

config.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/arl/gitmux/tmux"
+	"gopkg.in/yaml.v3"
+)
+
+// Config configures output formatting.
+type Config struct{ Tmux tmux.Config }
+
+// default config (decoded in init)
+var defaultCfg Config
+
+//go:embed .gitmux.yml
+var cfgBytes []byte
+
+func init() {
+	if err := yaml.Unmarshal(cfgBytes, &defaultCfg); err != nil {
+		panic(fmt.Sprintf("default config is invalid: %v", err))
+	}
+}

formater.go

@@ -30,11 +30,6 @@ Options:
   -V              prints gitmux version and exits.
 `
 
-// Config configures output formatting.
-type Config struct{ Tmux tmux.Config }
-
-var _defaultCfg = Config{Tmux: tmux.DefaultCfg}
-
 func parseOptions() (ctx context.Context, cancel func(), dir string, dbg bool, cfg Config) {
 	var (
 		dbgOpt      = flag.Bool("dbg", false, "")
@@ -60,13 +55,11 @@ func parseOptions() (ctx context.Context, cancel func(), dir string, dbg bool, c
 	}
 
 	if *printCfgOpt {
-		enc := yaml.NewEncoder(os.Stdout)
-		check(enc.Encode(&_defaultCfg), *dbgOpt)
-		enc.Close()
+		os.Stdout.Write(cfgBytes)
 		os.Exit(0)
 	}
 
-	cfg = _defaultCfg
+	cfg = defaultCfg
 
 	if *cfgOpt != "" {
 		f, err := os.Open(*cfgOpt)

gitmux.go

@@ -91,45 +91,6 @@ type options struct {
 	Ellipsis     string    `yaml:"ellipsis"`
 }
 
-// DefaultCfg is the default tmux configuration.
-var DefaultCfg = Config{
-	Symbols: symbols{
-		Branch:     "⎇ ",
-		Staged:     "● ",
-		Conflict:   "✖ ",
-		Modified:   "✚ ",
-		Untracked:  "… ",
-		Stashed:    "⚑ ",
-		Clean:      "✔",
-		Ahead:      "↑·",
-		Behind:     "↓·",
-		HashPrefix: ":",
-		Insertions: "Σ",
-		Deletions:  "Δ",
-	},
-	Styles: styles{
-		Clear:      "#[fg=default]",
-		State:      "#[fg=red,bold]",
-		Branch:     "#[fg=white,bold]",
-		Remote:     "#[fg=cyan]",
-		Divergence: "#[fg=default]",
-		Staged:     "#[fg=green,bold]",
-		Conflict:   "#[fg=red,bold]",
-		Modified:   "#[fg=red,bold]",
-		Untracked:  "#[fg=magenta,bold]",
-		Stashed:    "#[fg=cyan,bold]",
-		Clean:      "#[fg=green,bold]",
-		Insertions: "#[fg=green]",
-		Deletions:  "#[fg=red]",
-	},
-	Layout: []string{"branch", " ", "remote-branch", "divergence", " - ", "flags"},
-	Options: options{
-		BranchMaxLen: 0,
-		BranchTrim:   dirRight,
-		Ellipsis:     "…",
-	},
-}
-
 // A Formater formats git status to a tmux style string.
 type Formater struct {
 	Config