fix(git/cmd): parse :G args with shell-style quoting

lua/git/cmd.lua

@@ -42,6 +42,95 @@ local function git_cmds()
     return cached_cmds
 end
 
+---@param tok string
+---@return boolean
+local function is_expansion_target(tok)
+    local first = tok:sub(1, 1)
+    if first == "%" or first == "#" then
+        return true
+    end
+    if tok:match("^<%w+>") then
+        return true
+    end
+    if tok == "~" or tok:sub(1, 2) == "~/" then
+        return true
+    end
+    return false
+end
+
+---@param line string
+---@param i integer
+---@param buf string[]
+---@param escapes string?
+---@return integer
+local function parse_quoted(line, i, buf, escapes)
+    local quote = line:sub(i, i)
+    local n = #line
+    i = i + 1
+    while i <= n do
+        local c = line:sub(i, i)
+        if c == quote then
+            return i + 1
+        elseif escapes and c == "\\" and i < n then
+            local nxt = line:sub(i + 1, i + 1)
+            if escapes:find(nxt, 1, true) then
+                table.insert(buf, nxt)
+                i = i + 2
+            else
+                table.insert(buf, c)
+                i = i + 1
+            end
+        else
+            table.insert(buf, c)
+            i = i + 1
+        end
+    end
+    return i
+end
+
+---@param line string
+---@return string[]
+function M.parse_args(line)
+    local args = {}
+    local i, n = 1, #line
+    while i <= n do
+        local c = line:sub(i, i)
+        if c == " " or c == "\t" then
+            i = i + 1
+        else
+            local buf = {}
+            local quoted = false
+            while i <= n do
+                c = line:sub(i, i)
+                if c == " " or c == "\t" then
+                    break
+                elseif c == "\\" and i < n then
+                    table.insert(buf, line:sub(i + 1, i + 1))
+                    i = i + 2
+                elseif c == '"' then
+                    quoted = true
+                    i = parse_quoted(line, i, buf, '"\\$`')
+                elseif c == "'" then
+                    quoted = true
+                    i = parse_quoted(line, i, buf, nil)
+                else
+                    table.insert(buf, c)
+                    i = i + 1
+                end
+            end
+            local tok = table.concat(buf)
+            if not quoted and is_expansion_target(tok) then
+                local expanded = vim.fn.expand(tok) --[[@as string]]
+                if expanded ~= "" then
+                    tok = expanded
+                end
+            end
+            table.insert(args, tok)
+        end
+    end
+    return args
+end
+
 ---@param args string[]
 ---@param start integer
 ---@return string?
@@ -139,18 +228,6 @@ local function run_to_messages(r, args)
     )
 end
 
----@param args string[]
----@param flag string
----@return boolean
-local function has_flag(args, flag)
-    for _, a in ipairs(args) do
-        if a == flag then
-            return true
-        end
-    end
-    return false
-end
-
 ---@param args string[]
 ---@return boolean
 local function has_message(args)
@@ -177,14 +254,13 @@ function M.run(args)
 
     local sub = args[1]
     if sub == "commit" and not has_message(args) then
-        commit.commit({ amend = has_flag(args, "--amend") })
+        commit.commit({ args = vim.list_slice(args, 2) })
         return
     end
 
     if sub == "show" then
-        local arg = first_positional(args, 2)
-        if arg and arg:find(":", 1, true) then
-            object.open(r, arg)
+        if #args == 2 and args[2]:find(":", 1, true) then
+            object.open(r, args[2])
             return
         end
         run_in_split(r, args, { ft = "git", needs_rev = true })
@@ -192,12 +268,9 @@ function M.run(args)
     end
 
     if sub == "cat-file" then
-        if vim.list_contains(args, "-p") then
-            local rev = first_positional(args, 2)
-            if rev then
-                object.open(r, rev)
-                return
-            end
+        if #args == 3 and args[2] == "-p" then
+            object.open(r, args[3])
+            return
         end
         run_in_split(r, args, { ft = "git", needs_rev = true })
         return