Add config to truncate commit hashes when copying them to the clipboard

I often copy hashes in the commits panel in order to paste them into Github
comments (or other places), and I can't stand it when they have the full length.

I picked a default of 12 for this; I find this to be a good middle ground
between being reliable in large repos (12 still works in the linux kernel repo
today, but it might not be enough in really huge repos) and not being too ugly
(many smaller repos can probably get away with less).

We deliberately don't change this for the "Copy to clipboard" menu, since this
gives users a way to copy the unabbreviated sha if they need this occasionally.

docs/Config.md

@@ -126,6 +126,7 @@ git:
   overrideGpg: false # prevents lazygit from spawning a separate process when using GPG
   disableForcePushing: false
   parseEmoji: false
+  truncateCopiedCommitHashesTo: 12 # When copying commit hashes to the clipboard, truncate them to this length. Set to 40 to disable truncation.
 os:
   copyToClipboardCmd: '' # See 'Custom Command for Copying to Clipboard' section
   editPreset: '' # see 'Configuring File Editing' section

pkg/config/user_config.go

@@ -214,6 +214,9 @@ type GitConfig struct {
 	ParseEmoji bool `yaml:"parseEmoji"`
 	// Config for showing the log in the commits view
 	Log LogConfig `yaml:"log"`
+	// When copying commit hashes to the clipboard, truncate them to this
+	// length. Set to 40 to disable truncation.
+	TruncateCopiedCommitHashesTo int `yaml:"truncateCopiedCommitHashesTo"`
 }
 
 type PagerType string
@@ -700,6 +703,7 @@ func GetDefaultConfig() *UserConfig {
 			DisableForcePushing:          false,
 			CommitPrefixes:               map[string]CommitPrefixConfig(nil),
 			ParseEmoji:                   false,
+			TruncateCopiedCommitHashesTo: 12,
 		},
 		Refresher: RefresherConfig{
 			RefreshInterval: 10,

pkg/gui/global_handlers.go

@@ -110,6 +110,15 @@ func (gui *Gui) scrollDownConfirmationPanel() error {
 }
 
 func (gui *Gui) handleCopySelectedSideContextItemToClipboard() error {
+	return gui.handleCopySelectedSideContextItemToClipboardWithTruncation(-1)
+}
+
+func (gui *Gui) handleCopySelectedSideContextItemCommitHashToClipboard() error {
+	return gui.handleCopySelectedSideContextItemToClipboardWithTruncation(
+		gui.UserConfig.Git.TruncateCopiedCommitHashesTo)
+}
+
+func (gui *Gui) handleCopySelectedSideContextItemToClipboardWithTruncation(maxWidth int) error {
 	// important to note that this assumes we've selected an item in a side context
 	currentSideContext := gui.c.CurrentSideContext()
 	if currentSideContext == nil {
@@ -127,6 +136,10 @@ func (gui *Gui) handleCopySelectedSideContextItemToClipboard() error {
 		return nil
 	}
 
+	if maxWidth > 0 {
+		itemId = itemId[:utils.Min(len(itemId), maxWidth)]
+	}
+
 	gui.c.LogAction(gui.c.Tr.Actions.CopyToClipboard)
 	if err := gui.os.CopyToClipboard(itemId); err != nil {
 		return gui.c.Error(err)

pkg/gui/keybindings.go

@@ -146,7 +146,7 @@ func (self *Gui) GetInitialKeybindings() ([]*types.Binding, []*gocui.ViewMouseBi
 		{
 			ViewName:          "commits",
 			Key:               opts.GetKey(opts.Config.Universal.CopyToClipboard),
-			Handler:           self.handleCopySelectedSideContextItemToClipboard,
+			Handler:           self.handleCopySelectedSideContextItemCommitHashToClipboard,
 			GetDisabledReason: self.getCopySelectedSideContextItemToClipboardDisabledReason,
 			Description:       self.c.Tr.CopyCommitShaToClipboard,
 		},
@@ -166,7 +166,7 @@ func (self *Gui) GetInitialKeybindings() ([]*types.Binding, []*gocui.ViewMouseBi
 		{
 			ViewName:          "subCommits",
 			Key:               opts.GetKey(opts.Config.Universal.CopyToClipboard),
-			Handler:           self.handleCopySelectedSideContextItemToClipboard,
+			Handler:           self.handleCopySelectedSideContextItemCommitHashToClipboard,
 			GetDisabledReason: self.getCopySelectedSideContextItemToClipboardDisabledReason,
 			Description:       self.c.Tr.CopyCommitShaToClipboard,
 		},

schema/config.json

@@ -559,6 +559,11 @@
           "additionalProperties": false,
           "type": "object",
           "description": "Config for showing the log in the commits view"
+        },
+        "truncateCopiedCommitHashesTo": {
+          "type": "integer",
+          "description": "When copying commit hashes to the clipboard, truncate them to this\nlength. Set to 40 to disable truncation.",
+          "default": 12
         }
       },
       "additionalProperties": false,